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Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Kendra L. Russell, William J. Andrews, Amy R. McHugh · U.S. Geological Survey

USGS Publications · Papers · License: Public Domain

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usgs, geological survey, united states, science, government publication, usgs open-file report, 2025, 1051, river, master, delaware, period, december, 2017, november, 2018

Open-File Report 2025–1051

U.S. Department of the Interior U.S. Geological Survey

Calendar for Report Year 2018 S 3 10 17 24 31

M 4 11 18 25

December 2017 T W T

June 2018 W T

5 12 19 26

6 13 20 27

8 15 22 29

9 16 23 30

1 3

1 4

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3 6

1 7

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2 9

10 17 24

11 18 25

12 19 26

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14 21 28

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16 23 30

7 14 21 28

July 2018

January 2018 1 7

1 8

2 9

3 10

4 11

5 12

6 13

1 8

2 9

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4 11

5 12

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14 21 28

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31 1 4

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August 2018 1 1 2 7 8 9

3 10

4 11

11 18 25

12 19 26

13 20 27

14 21 28

15 22

16 23

17 24

12 19 26

13 20 27

14 21 28

17 24 31

18 25 30

1 4

1 5

March 2018 2 1 6 7 8

2 9

3 10

1 2

1 3

September 2018 2 3 1 4 5 6

1 8

11 18 25

12 19 26

13 20 27

16 23 30

17 24 31

9 16 23 30

10 17 24

11 18 25

13 20 27

14 21 28

15 22 29

April 2018 3 4 5

10 17 24

13 20 27

14 21 28

1 7

1 8

October 2018 2 3 4 9 10 11

5 12

6 13

14 21 28

15 22 29

16 23 30

18 25 28

19 26 29

20 27 30

30 1 4

31 1 5

November 2018 2 1 6 7 8

2 9

3 10

11 18 25

12 19 26

13 20 27

16 23 30

17 24

1 8 15 22 29

February 2018

9 16 23 30

14 21 28

11 18 25

15 22 29

12 19 26

May 2018 1 6

1 7

1 8

2 9

3 10

4 11

5 12

13 20 27

14 21 28

15 22 29

16 23 30

17 24 31

18 25

19 26

15 22 29

12 19 26

17 24 31

14 21 28

16 23 30

15 22 29

Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 By Kendra L. Russell, William J. Andrews, and Amy R. McHugh

Open-File Report 2025–1051

U.S. Department of the Interior U.S. Geological Survey

U.S. Geological Survey, Reston, Virginia: 2025

For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment—visit https://www.usgs.gov or call 1–888–392–8545. For an overview of USGS information products, including maps, imagery, and publications, visit https://store.usgs.gov/ or contact the store at 1–888–275–8747. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Suggested citation: Russell, K.L., Andrews, W.J., and McHugh, A.R., 2025, Report of the River Master of the Delaware River for the period December 1, 2017–November 30, 2018: U.S. Geological Survey Open-File Report 2025–1051, 79 p., https://doi.org/10.3133/ofr20251051. ISSN 0196-1497 (print) ISSN 2331-1258 (online) ISBN 978–1–4113–4631–4

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River Master Letter of Transmittal and Special Report Office of the Delaware River Master U.S. Geological Survey 415 National Center Reston, VA 20192 August 6, 2025 The Honorable John G. Roberts, Jr. Chief Justice of the United States The Honorable Matt Meyer Governor of Delaware The Honorable Phil Murphy Governor of New Jersey The Honorable Kathy Hochul Governor of New York The Honorable Josh Shapiro Governor of Pennsylvania The Honorable Eric Adams Mayor of the City of New York No. 5, Original—October Term, 1950 State of New Jersey, Complainant, v. State of New York and City of New York, Defendants

Commonwealth of Pennsylvania and State of Delaware, Intervenors.

To the Chief Justice of the United States: For the record, and in compliance with the provisions of the Amended Decree of the Supreme Court of the United States entered June 7, 1954, I hereby transmit the 65th Annual Report of the River Master of the Delaware River for December 1, 2017, to November 30, 2018. In this report, this period is referred to as the River Master “report year.” During the 2018 River Master report year, monthly precipitation in the upper Delaware River Basin ranged from 46 percent of the long-term average in December 2018 to 231 percent of the long-term average in August 2018. Precipitation from December to May, when reservoirs typically refill, was 20.51 inches. Precipitation was below normal in December, March, April, May, and June and above normal in the other 7 months. When the report year began on December 1, 2017, combined useable storage in the New York City reservoirs in the upper Delaware River Basin was 193.230 billion gallons or 71.3 percent of combined storage capacity. Combined storage in Pepacton, Cannonsville, and Neversink Reservoirs decreased in January 2018 and rose to more than 80 percent of combined usable storage in February, remaining above that level through November 2018. The combined usable storage was 264.292 billion gallons at the end of the report year on November 30, 2018. Throughout the report year, River Master operations were conducted as stipulated by the Decree and the 2017 Flexible Flow Management Program (FFMP2017) through the U.S. Geological Survey (USGS) Office of the Delaware River Master (ODRM) located at Milford, Pennsylvania (Pa.). Kendra Russell, Deputy Delaware River Master, was in charge of the office, assisted by Vincent DiFrenna, hydrologist. Shortly after the Decree was issued, the River Master established the River Master Advisory Committee (Advisory Committee), which consisted of principal representatives of the Decree Parties to provide advice and counsel regarding River Master operations. During the report year, the following individuals served as members of the Advisory Committee: Decree Party affiliation

Committee member

Delaware

David Wunsch

New Jersey

Michele Putnam

New York

Mark Klotz

New York City

Paul Rush

Pennsylvania

Tim Schaeffer

During the year, the Deputy River Master participated in two rounds of meetings with individual Advisory Committee members and staff of the Delaware River Basin Commission (DRBC) to introduce new staff and discuss a proposed ODRM 5-year plan of operations. On July 16, 2018, the full Advisory Committee met at New York City construction facilities in Marlborough, New York (N.Y.), with the River Master, Deputy River Master, and staff of the DRBC to discuss the newly drafted 5-year plan and to formulate plans for conducting studies identified in the FFMP2017. The Deputy Delaware River Master also met periodically with representatives of the Decree Parties as a member of the Decree Parties’ Work Group and the DRBC’s Regulated Flow Advisory Committee. During the year, the ODRM continued the weekly distribution of a summary hydrologic report. These reports contain provisional data on precipitation in the upper Delaware River Basin, releases and spills from New York City reservoirs to the Delaware River, diversions to the New York City water-supply system, reservoir contents, daily segregation of flow of the Delaware River at the USGS Montague, New Jersey, streamgage, and diversions by New Jersey. The reports were distributed to members of the Advisory Committee and other parties interested in ODRM operations. A monthly summary of hydrologic conditions was also

provided to Advisory Committee members. The weekly hydrologic reports are available through the ODRM website (https://webapps.usgs.gov/odrm/data/data.html). The first section of this report documents ODRM operations during the report year. During the year, New York City diverted 166.862 billion gallons from the Delaware River Basin and released 306.379 billion gallons from Pepacton, Cannonsville, and Neversink Reservoirs to the Delaware River. A total of 80.566 billion gallons was spilled from the Pepacton, Cannonsville, and Neversink Reservoirs. The ODRM directed releases from these reservoirs to the Delaware River that totaled 8.024 billion gallons. Throughout the year, diversions to New York City’s water-supply system and releases designed to maintain the flow of the Delaware River at the Montague site were made as directed by the ODRM. Diversions by New York City from its reservoirs in the Delaware River Basin did not exceed the limits stipulated by the Decree. Diversions by New Jersey were also within stipulated limits. The ODRM’s daily operation records were prepared from hydrologic data collected daily. Data for these records were collected and computed by the ODRM or were furnished by the following agencies and utilities: (1) data for streamflow of the Delaware River at Montague, New Jersey, by the USGS New Jersey Water Science Center (WSC) and for other locations and tributaries by the USGS New York and Pennsylvania WSCs; (2) data for Pepacton, Cannonsville, and Neversink Reservoirs by the New York City Department of Environmental Protection (NYCDEP), Bureau of Water Supply; (3) data for Lake Wallenpaupack by Brookfield Renewable U.S.; and (4) data for Rio Reservoir by Eagle Creek Renewable Energy, LLC, including plans for power generation and furnishing data on reservoir releases and elevations. The National Weather Service offices in Binghamton, N.Y., and State College, Pa., provided quantitative precipitation forecasts and some precipitation data. The River Master and staff are grateful for the continued cooperation and support of the Decree Parties and these agencies and utilities. Sincerely yours, /Signed/ Joseph P. Nielsen Acting Delaware River Master

Acknowledgments The Office of the Delaware River Master’s (ODRM) daily operation records were prepared from hydrologic data collected daily. Data for these records were collected and computed by the ODRM or provided by the following agencies and utilities. Data for streamflow of the Delaware River at Montague, New Jersey, and other locations and tributaries were provided by the U.S. Geological Survey (USGS). The New York City Department of Environmental Protection provided data for the Pepacton, Cannonsville, and Neversink Reservoirs. Brookfield Renewable U.S. provided data for Lake Wallenpaupack. Eagle Creek Renewable Energy, LLC, provided data for Rio Reservoir. The National Weather Service offices in Binghamton, New York, and State College, Pennsylvania, provided quantitative precipitation forecasts and some precipitation data. Darwin Ockerman of the USGS assisted and contributed to this report by collecting and organizing data.

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Contents Acknowledgments��vi Executive Summary��1 Introduction��1 Method to Determine Directed Releases From New York City Reservoirs��3 Segregating Streamflow Components��3 Forecasting Streamflow��3 Hydrologic Conditions��4 Precipitation��4 Reservoir Storage��5 Operations��7 Diversions to New York City Water Supply��7 Diversions by New Jersey��8 Montague Flow Objective��9 Excess Release Quantity and Interim Excess Release Quantity��11 Habitat Protection Program��11 Comparison of River Master Operations Data With Other Records��11 Analysis of Forecasts��11 Releases From New York City Reservoirs��12 Delaware River at Montague, New Jersey��12 Conformance of Operations Under the Amended Decree of the Supreme Court of the United States Entered June 7, 1954��15 Tables 1, 3–10, 13��16 References Cited��49 Glossary��50 Appendix 1. Modification and Reissuance of Appendix A of the 2017 Agreement for a Flexible Flow Management Program��53

Figures 1. 2.

Map showing the Delaware River Basin upstream from Wilmington, Delaware��2 Graph showing monthly precipitation, in inches, in the Delaware River Basin upstream of Montague, New Jersey, for the 2018 report year compared with the 1940–2017 monthly average��4 3. Graph showing rule curves and actual stored water, in billion gallons, for New York City reservoirs in the Delaware River Basin for the report year��6 4. Timeline bar graph showing the reservoir spill dates and total days of spill for when the Pepacton, Cannonsville, and Neversink Reservoirs reached maximum capacity and spilled between February 28 and November 30, 2018��6 5. Bar graph showing total daily diversions, in million gallons per day, from Pepacton, Cannonsville, and Neversink Reservoirs in the Delaware River Basin for New York City water supply and the daily average diversion from all three sources for the report year��7

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8. 9. 10.

Bar graph showing daily total and monthly average diversions by New Jersey, in million gallons per day, from the Delaware River Basin through the Delaware and Raritan Canal for the report year��9 Graphs showing flow components—uncontrolled runoff, powerplant reservoirs, and New York City reservoirs—for the Delaware River at Montague, New Jersey, from December 1, 2017–January 8, 2018, and June 15–July 26, 2018��10 Graphic showing Flexible Flow Management Program 2017 tables used for releases from New York City Delaware River Basin Reservoirs for the report year��11 Hydrographs of computed and forecasted uncontrolled runoff components, Delaware River at Montague, New Jersey��13 Graphs showing New York City-measured mean flow, in cubic feet per second, compared with computed mean flow records for U.S. Geological Survey streamgaging sites downstream from their respective reservoirs��14

Tables 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

11.

12.

13.

Precipitation in the Delaware River Basin upstream of Montague, New Jersey��16 Elevations and capacities of structures of the Pepacton, Cannonsville, and Neversink Reservoirs��5 Storage in Pepacton Reservoir, New York, for year ending November 30, 2018��17 Storage in Cannonsville Reservoir, New York, for year ending November 30, 2018��18 Storage in Neversink Reservoir, New York, for year ending November 30, 2018��19 Diversions to New York City water-supply system for the year ending November 30, 2018��20 Consumption of water by New York City, 1950–2018��26 Diversions by New Jersey, daily mean discharge, Delaware and Raritan Canal at Port Mercer, New Jersey, for the year ending November 30, 2018��28 New York City reservoir release design data for the year ending November 30, 2018��29 Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018��33 Forecasted and actual release volumes from Lake Wallenpaupack, Rio Reservoir, uncontrolled runoff, and directed releases for December 1–26, 2017; January 7–12, 2018; and June 16–July 26, 2018��12 Characteristics of U.S Geological Survey streamflow gaging stations from which measured streamflow data are compared with Office of the Delaware River Master streamflow data, December 2017–November 2018��15 Daily mean discharge of the Delaware River at Montague, New Jersey (U.S. Geological Survey site number 01438500), for report year ending November 30, 2018��48

Conversion Factors U.S. customary units to International System of Units

Multiply

To obtain

Length inch (in.)

2.54

centimeter (cm)

foot (ft)

0.3048

meter (m)

mile (mi)

1.609

kilometer (km)

square mile (mi2)

2.590

Area square kilometer (km2)

Volume million gallons (Mgal) billion gallons cubic foot per second accumulated daily ([ft3/s]-d) cubic foot per second (ft3/s)

3,785 3.785 2,447

cubic meter (m3) cubic hectometer (hm3) cubic meter per second accumulated daily ([m3/s]-d)

0.02832 cubic meter per second (m3/s) Flow rate

million gallons per day (Mgal/d)

0.04381 cubic meter per second (m3/s)

Datums Vertical coordinate information is referenced to the Bureau of Water Supply (BWS) datum, which was established by the New York City Department of Environmental Protection, Bureau of Water Supply. Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83). Elevation, as used in this report, refers to distance above the vertical datum.

Abbreviations BWS

Bureau of Water Supply

DRBC

Delaware River Basin Commission

FFMP

Flexible Flow Management Program

FFMP2017

2017 Flexible Flow Management Program

ft foot ft3/s

cubic foot per second

(ft3/s)-d

cubic foot per second accumulated daily

HPP

Habitat Protection Program

IERQ

Interim Excess Release Quantity

in. inch Mgal

million gallons

Mgal/d

million gallons per day

mi mile mi2

square mile

NAD 83

North American Datum of 1983

N.J.

New Jersey

N.Y.

New York

NYCDEP

New York City Department of Environmental Protection

ODRM

Office of the Delaware River Master

OST

Operational Support Tool

Pa. Pennsylvania USGS

U.S. Geological Survey

WSC

Water Science Center

Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 By Kendra L. Russell, William J. Andrews, and Amy R. McHugh

Executive Summary

Introduction

A Decree of the Supreme Court of the United States entered June 7, 1954 (New Jersey v. New York, 347 U.S. 995), established the position of Delaware River Master within the U.S. Geological Survey. In addition, the Decree authorizes the diversion of water from the Delaware River Basin and requires that compensating releases from certain reservoirs owned by New York City be made under the supervision and direction of the River Master. The Decree stipulates that the River Master provide reports to the Court, not less frequently than annually. This report is the 65th annual report of the River Master of the Delaware River. The report covers the 2018 River Master report year, from December 1, 2017, to November 30, 2018. During the report year, precipitation in the upper Delaware River Basin was 60.39 inches or 136 percent of the long-term average. On December 1, 2017, combined useable storage in the New York City reservoirs in the upper Delaware River Basin was 193.230 billion gallons or 71.3 percent of the combined useable storage capacity of 270.837 billion gallons. The reservoirs had a usable capacity of 99.5 percent on May 31, 2018. Combined storage remained high (above 80 percent combined capacity) and did not decline below 80 percent of combined capacity through November 30, 2018. River Master operations during the year were conducted as stipulated by the Decree and the Flexible Flow Management Program. Diversions from the Delaware River Basin by New York City and New Jersey fully complied with the Decree. Reservoir releases were made as directed by the River Master at rates designed to meet the flow objective for the Delaware River at Montague, New Jersey, on 42 days during the report year. Interim Excess Release Quantity banks and conservation releases, designed to relieve thermal stress and protect the fishery and aquatic habitat in the tailwaters of the reservoirs, were also made during the report year.

An Amended Decree of the Supreme Court of the United States entered June 7, 1954 (New Jersey v. New York, 347 U.S. 995; available at https://webapps.usgs.gov/odrm/ about/decree), authorizes diversion of water from the Delaware River Basin and provides for releases of water from three New York City reservoirs—Pepacton, Cannonsville, and Neversink—to the upper Delaware River. The Decree stipulates that these diversions and releases be made under the supervision and direction of the Office of the Delaware River Master (ODRM). The Decree also stipulates that reports on Delaware River operations be made to the Court not less frequently than annually. The reports can be accessed at https://webapps.usgs.gov/odrm/publications/publications. This report documents operations of the ODRM from December 1, 2017, to November 30, 2018, or the 2018 River Master report year, hereafter referred to as the “report year.” The ODRM operations were guided by a Flexible Flow Management Program (FFMP) signed by all of the Decree Parties by October 23, 2017 (Russell and others, 2024). That FFMP was set to expire on May 31, 2023, or, pending successful execution of some of its various provisions, May 31, 2028. A modification and reissuance of “Appendix A (Operations Plan)” of the FFMP on July 16, 2018 (appendix 1 of this report) added clarification to the text, tables, and graphics, with operations fundamentally unchanged. Changes in the “Agreement and Operation Plans (Appendix A)” of both of those FFMP versions are referred to as the 2017 Flexible Flow Management Program (FFMP2017) in this report (app. 1). Some hydrologic data presented in this report are records of streamflow for U.S. Geological Survey (USGS) data-collection stations. These records were collected and computed by the offices of the USGS at Troy, New York (N.Y.), and Lawrenceville, New Jersey (N.J.), in cooperation with the States of New York and New Jersey and the City of New York. The locations of major streams, reservoirs, and selected USGS streamgaging stations (streamgages) in the Delaware River Basin are shown in figure 1.

2 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 76° Map area

75°

Delaware Bay

EXPLANATION Delaware River Basin boundary

Roundout Reservoir Dela

Neversink

Tusten Hawley Shohola

Lake Wallenpaupack

Key gaging station

war

q u ed uct

Mongaup Reservoir Rio Reservoir Port Jervis

Milford

Montague #

Francis E. Walter Reservoir

City

Neversink Tunnel

Callicoon

Equinunk

General Edgar Jadwin Reservoir Prompton Lake Lackawaxen River

Index gaging station

East Delaware Tunnel

River

42°

Beaver Kill

Downsville # West De laware Tunne l Deposit # Stilesville Cooks Neversink Falls Reservoir

ATLANTIC OCEAN

NEW YORK

Pepacton Reservoir

Hudson

East Branch Delaware River

West Branch Delaware River Cannonsville Reservoir

MA NY

74°

Lake Hopatcong Beltzville Lake Leh i

Merrill Creek Delaware and Raritan Canal Reservoir

r ve Ri

41°

NEW JERSEY

PENNSYLVANIA

# Kingston # Port Mercer

Blue Marsh Lake

Trenton #

Schuylkill R ive r

r ive

aw a

Trenton

Bra n

Philadelphia

wi n

ek re

Wilmington 40°

MARYLAND Base from U.S. Geological Survey digital data, 1:1,000,000 Albers Equal-Area Conic projection North American Datum of 1983

DELAWARE 0 0

10 10

20 MILES 20 KILOMETERS

Figure 1. Map showing the Delaware River Basin upstream from Wilmington, Delaware. The Delaware River Basin boundary is shown along with key gaging stations and index gaging stations; refer to the “Glossary” section for definitions.

Method to Determine Directed Releases From New York City Reservoirs 3

Method to Determine Directed Releases From New York City Reservoirs The data and computations of the various streamflow components form the operational record used by the ODRM to carry out responsibilities related to the Montague formula, as specified by the Decree. The operational record has two parts: (1) segregating the streamflow components of the current daily mean discharge at the USGS streamgage at the Delaware River at Montague, N.J. (site number 01438500), referred to as the “Montague site,” to compute the uncontrolled runoff and (2) forecasting the uncontrolled runoff and using forecasted information from other sources to predict the flow at the Montague site with adequate advance time to direct releases. The forecasting process determines whether the ODRM directs New York City reservoir releases to maintain, at a minimum, the flow objective at the Montague site, which is defined in table 1 of appendix 1.

Segregating Streamflow Components The segregation of streamflow at the Montague site involves determining the flow components, including releases from New York City’s Delaware River Basin reservoirs, releases from Lake Wallenpaupack and Rio Reservoir for generation of hydroelectric power, and uncontrolled runoff. For the segregation of components of daily mean flow at the Montague site, the following data are used: 1. controlled releases from the Pepacton, Cannonsville, and Neversink Reservoirs of New York City; 2. controlled releases from Lake Wallenpaupack on Wallenpaupack Creek to produce hydroelectric power; and 3. controlled releases from Rio Reservoir on the Mongaup River to produce hydroelectric power. To determine the contributions of each of these releases, the amount of time it takes the water to travel from the release point to the Montague site (traveltime) is required. The traveltimes determine the appropriate time-delayed flow contributions from the controlled releases. The time-adjusted controlled releases are subtracted from the total streamflow measured at the Montague site to determine the uncontrolled runoff (including reservoir spills and groundwater) from the drainage area upstream from the Montague site. The traveltimes were computed from the reservoir and powerplant operations data and historical streamflow records. The traveltimes are adequate for ODRM operations. Occasionally, however, significant exceptions are observed. For example, during a large increase in directed release from Cannonsville Reservoir, the arrival time of the water at the Montague site can be delayed as long as 1.5 days because a

substantial amount of water must first fill the channel before a steady flow arrives at the Montague site. During winter, ice formation and lower streamflow gradually increase the resistance to water flow, resulting in increased traveltimes. Because ice-affected traveltimes increase gradually across several days and releases were not directed to meet the Montague flow objective during periods of ice, no adjustments were made to compensate for these increased traveltimes during the report year. The average traveltimes, in hours, for the effective travel of water from the various sources of controlled supply to the Montague site were used for flow routing during the report year: Pepacton Reservoir, 60; Cannonsville Reservoir, 48; Neversink Reservoir, 33; Lake Wallenpaupack, 24; and Rio Reservoir, 8. The traveltime used for Lake Wallenpaupack controlled releases, in 2016, changed from 16 hours to 24 hours based on data from Brookfield Renewable U.S.

Forecasting Streamflow The releases from New York City’s reservoirs necessary for meeting the Montague flow objective were computed based on the forecasted streamflow, exclusive of releases from New York City’s Delaware River Basin reservoirs. The flow must be forecast 3 days in advance to account for the longest traveltime needed for the flow to reach the Montague site from the New York City reservoirs. The electric utilities Brookfield Renewable U.S. and Eagle Creek Renewable Energy, LLC, provided daily forecasts of power generation and releases to the Delaware River Basin from Lake Wallenpaupack and Rio Reservoir, respectively, to the ODRM. Because the hydroelectric powerplants were primarily used for meeting rapidly varying peak power demands, those forecasts were subject to various modifying factors, including the vagaries of weather on electricity demand. In addition, because the power companies are members of regional transmission organizations, demand for power outside the local service area can unexpectedly affect power-generation schedules. Consequently, the actual release of water for power generation can differ from the forecasts used in the design of reservoir releases. For computational purposes during low-flow periods, estimates of uncontrolled runoff at the Montague site were treated as two components: (1) current runoff and (2) forecasted runoff from precipitation. An estimate of uncontrolled runoff was computed using a recession procedure. A recession curve of uncontrolled inputs was developed using the discharge at the Montague site and is used to forecast the uncontrolled portion of flow at the Montague site 3 days in advance. Forecasted runoff was determined using data from the National Weather Service office in Binghamton, N.Y., which provided quantitative forecasts of average precipitation and air temperatures for the 3,480-square-mile (mi2) drainage basin upstream from the Montague site. During winter, runoff was estimated based on the status of snow and ice, along with forecasted precipitation and temperature. During other periods, forecasted precipitation was used to estimate runoff.

4 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 The forecasted flow at the Montague site, exclusive of releases from New York City’s Delaware River Basin reservoirs, is computed as the sum of forecasted releases from hydroelectric power reservoirs, estimated uncontrolled runoff, including conservation releases from Rio Reservoir, and estimated runoff from predicted rainfall. All of these inputs are adjusted for traveltime. If the computed total flow is less than the flow objective at the Montague site, the deficiency is compensated with releases from New York City’s reservoirs, as directed by the ODRM. When updated forecasts of precipitation or hydroelectric powerplant releases showed significant changes after a release was directed, the release required from New York City’s reservoirs was recomputed based on the updated forecasts. Commonly, this procedure resulted in a reduced release requirement for the New York City reservoirs that day. Only the final directed release values for New York City reservoirs are presented in this report. A balancing adjustment is applied to directed releases based on the performance of the flow forecast beginning June 15 of each year. The balancing adjustment calls for more water to be released when previous directed releases (or a lack of releases) were insufficient to meet the Montague flow objective. The adjustment calls for less water to be released when previous directed releases were higher than required to meet the Montague flow objective. The balancing adjustment is computed as 10 percent of the difference between the cumulative directed release and the cumulative directed release required for exact forecasting and is limited to a maximum of 50 cubic feet per second (ft3/s). As part of several studies defined in FFMP2017, it was determined that the “Decree Parties shall study, evaluate, and consider the River Master’s balancing adjustment procedure” (Parties of the 1954 U.S. Supreme Court Decree, 2017). A cursory review of the balancing adjustment procedure in 2018 resulted in an immediate proposed refinement. New York City reservoir operations include conservation releases unrelated to flow at the Montague site (refer to the “Habitat Protection Program” section). The conservation

releases can be greater than releases directed by the ODRM to meet the flow target at the Montague site. In these instances, the accuracy of the directed release does not affect the operations of the reservoirs and the flow target is met, yet the forecast error is still accumulated and applied in the balancing adjustment. The proposed refinement limits the error accumulation, and the applied adjustment occurs only when directed releases are greater than the conservation releases. The change in the procedure was implemented on July 15, 2018, with a more detailed assessment planned for the following years as part of the “FFMP 2017 Balancing Adjustment Study” (Russell and others, 2024).

Hydrologic Conditions Precipitation The sum of the monthly average precipitation across the Delaware River Basin upstream of the Montague site was 60.39 inches (in.) during the report year and was 136 percent of the long-term (77-year) average (table 1). Monthly precipitation ranged from 46 percent of the long-term average in December 2017 to 231 percent of the long-term average in August 2018 (table 1; fig. 2). Precipitation data for the report year were computed from records for five geographically distributed stations: the Pepacton, Neversink, and Cannonsville Reservoirs; Hawley, Pennsylvania (Pa.); and Milford, Pa. These stations were operated by the New York City Department of Environmental Protection (NYCDEP) Bureau of Water Supply, the National Weather Service, and the ODRM. The seasonal period from December to May is typically when surface-water and groundwater reservoirs refill. For the 2018 report year, total precipitation was 20.51 in., which is 100 percent of the 77-year long-term average (table 1). During the June–November period, total precipitation was 39.88 in., which is about 166 percent of the 77-year long-term average (table 1).

Monthly precipitation, in inches

EXPLANATION

9 8

Average monthly, 1940−2017

Monthly average, 2018

6 5 4 3 2 1 0

Dec.

Jan.

Feb.

Mar.

Apr.

May

June

July

Aug.

Sept.

Oct.

Nov.

2018 report year

Figure 2. Graph showing monthly precipitation, in inches, in the Delaware Rive Basin upstream of Montague, New Jersey, for the 2018 report year (December 1, 2017–November 30, 2018) compared with the 1940–2017 monthly average.

Hydrologic Conditions 5

Reservoir Storage Pertinent levels and contents of the Pepacton, Cannonsville, and Neversink Reservoirs are shown in table 2. The NYCDEP provided this information. Daily storage in the Pepacton, Cannonsville, and Neversink Reservoirs above the point of maximum depletion, or minimum full-operating level, is given in tables 3, 4, and 5, respectively, and combined storage during the report year is shown in figure 3. On December 1, 2017, combined useable storage in the three reservoirs was 193.230 billion gallons or 71.35 percent of the combined capacity of 270.837 billion gallons. Combined storage increased to about 100 percent of usable capacity during April 7–May 31, 2018.

Combined storage remained high (above 80 percent combined capacity) through November 30, 2018. The lowest combined storage was 181.198 billion gallons (67.7 percent of combined capacity) on January 11, 2018; the maximum combined storage was 274.347 billion gallons on April 19, 2018. The combined storage was 264.292 billion gallons (98.8 percent of combined capacity) on November 30, 2018. The three reservoirs spilled a total of 80.566 billion gallons during the report year when reservoirs reached maximum capacity. The first spill occurred on February 28, 2017, at Neversink Reservoir. Pepacton Reservoir spilled on 85 days, Cannonsville Reservoir spilled on 64 days, and Neversink Reservoir spilled on 132 days (fig. 4).

Table 2. Elevations and capacities of structures of the Pepacton, Cannonsville, and Neversink Reservoirs. [Sum of all volumes for each reservoir is gross storage, above sill of diversion tunnel is available storage, and at point of maximum depletion is usable storage. Reservoir storage volumes were modified based on a survey conducted by the U.S. Geological Survey for the New York City Department of Environmental Protection (Nystrom, 2018). Updated values for report year used starting June 1, 2018. ft, foot; Mgal, million gallons; —, not applicable]

Level description

Reservoir volume (Mgal)

Updated reservoir volume (Mgal), beginning June 1, 2018

Reservoir elevation (ft)

Pepacton

Cannonsville

Neversink

Pepacton

Cannonsville

Neversink

Pepacton

Cannonsville

Neversink

Full pool or spillway crest

—

1,280

1,150

1,440

Point of maximum depletion

1140,190

195,706

134,941

1139,320

193,448

34,692

1,152

1,040

1,319

Sill of diversion tunnel

23,511

21,020

2525

23,468

2931

2471

1,143

31,035

1,314

Sill of river outlet tunnel

44,200

41,564

—

44,453

41,446

—

1,126.50

1,020.5

1,314

Dead storage

1,800

328

1,680

1,449

179

1,484

—

1This quantity is stored between the full pool or spillway crest and the point of maximum depletion. 2This quantity is stored between the point of maximum depletion and the sill of the diversion tunnel. 3This elevation is at the mouth of the inlet channel of the diversion works. 4This quantity is stored between the sill of diversion tunnel and the sill of the river outlet tunnel.

6 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 300

Spill mitigation (L1)

Full capacity usable storage

Actual contents

Combined reservoir storage, in billion gallons

250

Normal (L2) Drought watch (L3)

200

(L1) Drought warning (L4)

150

100

Drought emergency (L5) 50

0 Dec. 1

Dec. 31

Jan. 30

Mar. 1

Mar. 31

Apr. 30

2017

May 30

June 29

July 29

Aug. 28

Sept. 27

Oct. 27

Nov. 26

2018

Figure 3. Graph showing rule curves and actual stored water, in billion gallons, for New York City reservoirs in the Delaware River Basin for the report year (December 1, 2017–November 30, 2018). Full capacity usable storage line and the five conservation release rate zones (L1–L5) are shown. The conservation release rate zones are defined in the “conservation release” definition in the “Glossary” section. The total capacities of the Pepacton, Cannonsville and Neversink Reservoirs were updated on June 1, 2018, based on a survey conducted by the U.S. Geological Survey for the New York City Department of Environmental Protection (Nystrom, 2018).

Reservoir spill dates Total days of spill Pepacton

85 days

Cannonsville

64 days

Neversink

132 days

Feb.

Mar.

Apr.

May

June

July

Aug.

Sept.

Oct.

Nov.

Dec.

2018

Figure 4. Timeline bar graph showing the reservoir spill dates and total days of spill for when the Pepacton, Cannonsville, and Neversink Reservoirs reached maximum capacity and spilled between February 28 and November 30, 2018.

Operations 7

Operations Operations from December 1, 2017, through November 30, 2018, were conducted as described by the FFMP2017 (app. 1). The allowable diversion to New York City was 800 million gallons per day (Mgal/d) throughout the year. The Montague flow objective was 1,750 ft3/s. The allowable diversion to New Jersey was a monthly average of 100 Mgal/d, with a daily maximum of 120 Mgal/d. Conservation releases from New York City reservoirs were made at the rates described in FFMP2017 (app. 1; Russell and others, 2024).

Diversions to New York City Water Supply The 1954 Amended Decree (New Jersey v. New York, 347 U.S. 995) authorizes New York City to divert water from the Delaware River Basin at a rate not to exceed the equivalent of 800 Mgal/d. The Decree specifies that the diversion rate shall be computed as the aggregate total diversion beginning June 1 of each year divided by the total number of days elapsed since the preceding May 31. Under the FFMP2017, New York City diversion limits are reduced during the “drought watch,” “warning,” and “emergency” conditions.

The records of daily diversions through the East Delaware, West Delaware, and Neversink Tunnels (fig. 1) were provided to the ODRM by the NYCDEP. These records were obtained from calibrated instruments belonging to New York City that were connected to Venturi meters installed in the tunnel conduits. The flow measurements were transmitted electronically on a 15-second interval to New York City computers; 5-minute interval release and diversion quantities for the preceding 5-minute period were computed using the instantaneous rate-of-flow data from each instrument. These 5-minute quantities were then summed to compute daily total flows, which were reported daily to the ODRM. Each week, the computed diversion values were checked against the flow-meter totalizer readings by the NYCDEP and corrected when necessary. For the report year, daily diversions from the Pepacton, Cannonsville, and Neversink Reservoirs to the New York City water-supply system (Rondout Reservoir) are given in table 6 and figure 5. A running account of the average rates of combined diversions from the three reservoirs from June 1, computed as stipulated by the Decree, is also shown in table 6 and figure 5. A total of 166.862 billion gallons of water was diverted to the New York City water-supply system during the report year, with a daily average of 457 million gallons (Mgal), which is below the maximum diversion rate (table 6).

1,200

Diversion, in million gallons per day

1,000 Limit for average diversion

800

600

400

200

0 Dec.

2017

Jan.

Feb.

Mar.

Apr.

May

June

2018

July

Aug.

Sept.

Oct.

Nov.

EXPLANATION East Delaware Tunnel West Delaware Tunnel Neversink Tunnel Daily average beginning June 1

Figure 5. Bar graph showing total daily diversions, in million gallons per day (Mgal/d), from Pepacton, Cannonsville, and Neversink Reservoirs in the Delaware River Basin for New York City water supply and the daily average diversion (computed starting on June 1 of each year) from all three sources for the report year (December 1, 2017– November 30, 2018). The method or combined methods of diversion for each day—East Delaware Tunnel, West Delaware Tunnel, and Neversink Tunnel—are shown. The standard limit for average diversion (800 Mgal/d) is also labeled.

8 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 The maximum daily diversion from a single reservoir was 511 Mgal on October 26, 2018, from the Pepacton Reservoir (table 6). The maximum daily combined diversion from all three reservoirs was 1,107 Mgal on December 28, 2017 (table 6). Diversions by New York City did not exceed the limits stipulated by the Decree and FFMP2017. The data on water consumption by the City of New York for each calendar year since 1950, from all sources of supply, are presented in table 7. In addition to diversions for water supply by New York City, the diversion tunnels serving as conduits for that water can also leak under varying conditions. Such leakages are not included in diversion numbers. The East Delaware Tunnel is used to divert water from the Pepacton Reservoir to the Rondout Reservoir. The hydroelectric powerplant at the downstream end of the East Delaware Tunnel operated most days of the report year. When the powerplant was not operating, some water leaked through the wicket gates and was not recorded on the totalizer. A current-meter measurement made in 1989 showed that the (assumed constant) leakage rate is about 12.4 ft3/s (8.0 Mgal/d). Because the powerplant was not in operation for the equivalent of 40 days during the report year, the estimated quantity of unmeasured leakage (diverted but not recorded) was about 0.3 billion gallons. The West Delaware Tunnel is used to divert water from the Cannonsville Reservoir to the Rondout Reservoir. When the valves were closed, inspections of the channel below the outlet revealed negligible leakage. A hydroelectric powerplant uses water diverted through the West Delaware Tunnel, but the plant operates only when diversions are less than 300 Mgal/d. When the powerplant is not operating, the valves on the pipelines to the plant are closed, and there is no leakage through the system. The Neversink Tunnel is used to divert water from the Neversink Reservoir to the Rondout Reservoir. A hydroelectric powerplant uses water diverted through the Neversink Tunnel. When the powerplant is not operating and the main

valve on the diversion tunnel is open, leakage develops that is not recorded on the Venturi meters. One current-meter measurement made in 1999 showed a leakage rate of 16.2 ft3/s (10.5 Mgal/d). The leakage is included in the recorded flow when the powerplant is operating. No leakage occurs when the main valve on the tunnel is closed. During the report year, the powerplant operated part of the day on most days and was not operated for the equivalent of 315 days. About 3.3 billion gallons of water was diverted but not recorded, according to the leakage rate noted above and records of powerplant operation.

Diversions by New Jersey The Decree authorizes New Jersey to divert water from the Delaware River and its tributaries in New Jersey to areas outside of the Delaware River Basin without compensating releases. The Decree specifies that New Jersey diversions shall not exceed 100 Mgal/d as a monthly average, and the daily diversion shall not exceed 120 Mgal/d. Under the FFMP2017 (app. 1), New Jersey diversion limits are reduced during “drought warning” and “emergency” conditions. The USGS streamgage on the Delaware and Raritan Canal at Port Mercer, N.J. (site number 01460440; fig. 1) is used as the official control point for measuring the diversions by New Jersey. Based on data collected by the USGS at this site, the maximum monthly average diversion was 97.6 Mgal/d in June 2018 (table 8; fig. 6.) (USGS, 2019e). The maximum daily mean diversions were 101 Mgal/d on June 22, 34, 25, and 27, 2018 (table 8; fig. 6). Negative diversion quantities of –122 and –90 Mgal/d on May 27 and November 25, 2018, respectively, indicate the return of diverted water from the Delaware and Raritan Canal back to the Delaware River (table 8; fig. 6). Diversions by New Jersey did not exceed the limits stipulated by the Decree and the FFMP2017 (app. 1).

Operations 9 150

Diversions, in million gallons per day

125 100 75 50 25 0 −25 −50 −75 −100 Dec.

2017

Jan.

Feb.

Mar.

Apr.

May

June

2018

July

Aug.

Sept.

Oct.

Nov.

EXPLANATION Daily diversion Monthly average diversion Daily limit Monthly average limit

Figure 6. Bar graph showing daily total and monthly average diversions by New Jersey, in million gallons per day, from the Delaware River Basin through the Delaware and Raritan Canal for the report year (December 1, 2017– November 30, 2018). Negative values indicate water returned to the Delaware River. The daily limit and monthly average limit are also shown.

Montague Flow Objective The components of forecasted flow at the Montague site during low flow—forecasted releases from hydroelectric power reservoirs, estimated uncontrolled runoff (including conservation releases from Rio Reservoir), and forecasted increase in runoff from precipitation—and the sums of flows exclusive of releases from New York City’s reservoirs are given in table 9. If the computed sum of the components is less than the Montague flow objective, then the deficiency is made up by releases from New York City’s reservoirs, as directed by the ODRM. Table 10 presents the ODRM daily operations record of reservoir releases and segregation of the various components contributing to the flow of the Delaware River at the Montague site. The forecasted flow of the Delaware River at the Montague site, based on provisional data and exclusive of water released from the New York City reservoirs, was less

than the flow objective, and directed releases were required for a total of 42 days. On 2 days in December 2017 and 2 days in July 2018, the observed flow was less than the flow objective (table 10, col. 11) (USGS, 2019d)—all four observed flows were within 16 percent of the flow objective. The components of the total flow observed at the Montague site for December 1, 2017–January 8, 2018, and June 15–July 26, 2018, are segregated into the portion derived from the New York City reservoirs, the portion contributed by the powerplant reservoirs, and the uncontrolled runoff from the drainage area below the reservoirs in figure 7. As previously described, the uncontrolled runoff was computed as the residual of observed flow minus releases and was subject to errors in the observations, transit times, and routings of the various flow components. The conservation release from the Rio Reservoir is included in the power reservoir contribution.

10 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

4,000

A EXPLANATION Uncontrolled runoff

3,500

Powerplant reservoirs New York City reservoirs

3,000

2,500

2,000

Montague flow objective

1,500

Discharge, in cubic foot per second

1,000

500

4,000

December

January

2017

2018

EXPLANATION Uncontrolled runoff

3,500

Powerplant reservoirs New York City reservoirs

3,000

2,500

2,000

Montague flow objective

1,500

1,000

500

June

2018

July

Figure 7. Graphs showing flow components—uncontrolled runoff, powerplant reservoirs, and New York City reservoirs—for the Delaware River at Montague, New Jersey (U.S. Geological Survey, 2019d) from (A) December 1, 2017–January 8, 2018, and (B) June 15–July 26, 2018. The Montague flow objective is also shown.

Operations 11

Excess Release Quantity and Interim Excess Release Quantity Per sections 4b and 4c of FFMP2017 (app. 1), the Decree Parties agreed to use the Excess Release Quantity, as defined in the Decree, in support of an Interim Excess Release Quantity (IERQ). Four IERQ banks of water were established to be used each year to enhance base releases as needed from the New York City reservoirs. Table 10 shows the daily usage of those banks throughout the report year. All bank usages are reset to zero on June 1 of each year. From June 1, 2017, to May 31, 2018, 634 cubic feet per second accumulated daily ([ft3/s]-d) was released from the rapid flow change mitigation bank (Russell and others, 2024). No other banks were used through May 31, 2018. From June 1, 2018, through the remainder of the report year, the usage for each bank was— 1. Trenton Equivalent Flow Objective: No requests were made, and this bank was not used. 2. Thermal Mitigation: The NYCDEP requested a total of 1,648 (ft3/s)-d be released to mitigate thermal events affecting fisheries. This amount was released June 17, 2018–July 16, 2018. 3. Rapid Flow Change Mitigation: No requests were made, and this bank was not used. 4. New Jersey Diversion Amelioration: This bank is reserved for use during drought conditions, which did not occur during the report year.

Habitat Protection Program The FFMP2017 (app. 1) established a Habitat Protection Program (HPP) to protect the cold-water fishery in the basin while maintaining aquatic community diversity, structure, and function through improved ecological flow releases. Conservation releases above the base releases given in table 4a (FFMP2017) are made under the HPP when an assessment by New York City, using its Operations Support Tool (OST) as guidance, determines that additional water is available for releases and that any risk to the New York City water supply is acceptable (app. 1; Russell and others, 2024). Controlled releases were made from New York City’s Delaware River Basin reservoirs in accordance with the FFMP2017. From December 1, 2017, to November 30, 2018, 305.314 billion gallons was released from the New York City Delaware River Basin reservoirs in accordance with the HPP. Release tables 4g, 4f, 4e, and 4d from FFMP2017 (app. 1) were used during the report year as determined by the status of usable reservoir storage and OST guidance (fig. 8; refer to “Archived OST Summary Data” at https://webapps.usgs.gov/ odrm/data/data.html).

Section 4d of FFMP2017 (app. 1) established the New Jersey Diversion Offset Bank for use during drought conditions. The bank accumulates in increments according to the release table in use—per the FFMP2017 operations plan— not to exceed 2,300 (ft3/s)-d. The bank accumulation reached 2,300 (ft3/s)-d on November 11, 2018; it was not available for use during the report year as drought conditions did not occur. Reservoir conservation release tables used during the report year Table 4g

Table 4f

Table 4e

Table 4d

Dec. Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec.

2017

2018

Figure 8. Graphic showing Flexible Flow Management Program 2017 tables used for releases from New York City Delaware River Basin Reservoirs for the report year (December 1, 2017–November 30, 2018) (app. 1).

Comparison of River Master Operations Data With Other Records The ODRM operations are conducted daily and, by necessity, use preliminary data on streamflow. This section compares forecasted and actual releases for hydroelectric power generation, forecasted versus observed runoff from uncontrolled areas, and records used in the ODRM operations compared with final streamflow data published for selected USGS streamgages. The release data were reported in million gallons per day and converted to cubic feet per second for comparisons.

Analysis of Forecasts Based on anticipated contributions from the flow components described previously, but excluding releases from New York City reservoirs, forecasted streamflow at the Montague site differed from observed flow on most days. Occasionally, component variations were partially compensating and observed flows are comparable to flows. The forecasted flow of the Delaware River at the Montague site, exclusive of releases from the New York City-reservoirs, was less than the flow objective on 19 days in December 2017, 3 days in January 2018, 10 days in June 2018, and 11 days in July 2018 (table 9).

12 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 As described in the “Forecasting Streamflow” section of this report, the forecasted and actual flow releases from hydroelectric power generations can vary due to changes in demand and hydrologic conditions. Forecasted and actual releases from Lake Wallenpaupack and Rio Reservoir can differ considerably on any day. The total actual and forecasted releases from the hydroelectric plants and for the periods when ODRM was directing releases—December 1–26, 2017; January 7–12, 2018; and June 16–July 26, 2018—are shown in table 11. Forecasted releases at Lake Wallenpaupack differed from 1,458 ft3/s less than to 108 ft3/s greater than actual releases. Forecasted releases at Rio Reservoir differed from 603 ft3/s less than to 213 ft3/s greater than actual releases. Forecasted releases from Lake Wallenpaupack and Rio Reservoir averaged 19 and 22 percent less than the actual releases, respectively. Powerplant forecasted releases are calculated from columns 1 and 2 in table 9; powerplant actual releases are calculated from columns 5 and 6 in table 10. A comparison of forecasted and computed runoff from the uncontrolled area (table 11 and fig. 9) indicated that the forecasts were generally suitable for use in designing releases from New York City Delaware River Basin reservoirs. Forecasted runoff (columns 3 + 4 in table 9) from the uncontrolled area was 10 percent less than observed runoff (column 10 in table 10). Numerical adjustments to the designs were made when needed to compensate for forecast errors. However, because of traveltimes, the effects of the adjustments on flows at the Montague site were not evident until several days after the design dates. Based on gaged streamflow at the Montague site, total directed releases from New York City reservoirs during the report year (column 9 in table 9) were about 0.5 percent less than required for exact forecasting (column 11 in table 9).

Releases From New York City Reservoirs

collected from calibrated instruments connected to Venturi meters installed in the outlet conduits of the reservoirs. In this section, those data are compared with streamflow data observed at three USGS streamflow gaging stations downstream of those reservoirs. Figure 10 shows the measured flow from the Pepacton, Cannonsville, and Neversink Reservoirs, including spillway, conservation, and directed releases, as reported by New York City, compared with records for the USGS streamgages located downstream of each reservoir (table 11; USGS, 2019a), from December 1, 2017, to November 30, 2018. Table 12 lists the locations of those USGS streamflow gaging stations and descriptions of the discharges measured, upstream drainage areas, records ratings, mean percent differences between New York City and USGS reported daily streamflows, and the 95th percentile of differences between those streamflows. The mean differences between New York City and USGS reported daily streamflows are 5.7, 5.5, and 9.1 percent; 95 percent of the daily differences between the USGS streamgage readings and New York City records are within 16.2, 16.8, and 31.1 percent, respectively. Large differences rarely occur and can be due to rainfall. Instruments connected to the Venturi meters were recalibrated periodically by New York City to improve the accuracy of the recorded flow data.

Delaware River at Montague, New Jersey The ODRM operations record for the Delaware River at Montague, N.J. (table 10), showed about 0.02 percent more discharge for the report year than the published USGS record for the streamgage (table 13). Daily values for the two records agreed closely, except during ice-affected periods and the summer vegetation-growth season.

The ODRM operations data of controlled releases from the Pepacton, Cannonsville, and Neversink Reservoirs were provided by the NYCDEP to the ODRM. These data were Table 11. Forecasted and actual release volumes from Lake Wallenpaupack, Rio Reservoir, uncontrolled runoff, and directed releases for December 1–26, 2017; January 7–12, 2018; and June 16–July 26, 2018. [(ft3/s)-d, cubic feet per second accumulated daily]

Forecasted volume ([ft3/s]-d)

Actual volume ([ft3/s]-d)

Lake Wallenpaupack

11,288

13,989

Rio Reservoir

7,652

9,813

Runoff from uncontrolled area

120,295

133,663

Directed releases

12,413

12,351

Releases and runoff

Operations 13

4,400

A EXPLANATION Computed uncontrolled runoff Forecast uncontrolled runoff

3,900

3,400

2,900

2,400

1,900

Discharge, in cubic feet per second

1,400

900

400

4,400

December

2017

January

2018

EXPLANATION 3,900

Computed uncontrolled runoff Forecast uncontrolled runoff

3,400

2,900

2,400

1,900

1,400

900

400 15

December

2017

January

2018

Figure 9. Hydrographs of computed and forecasted uncontrolled runoff components, Delaware River at Montague, New Jersey (U.S. Geological Survey, 2019d), (A) December 1, 2017–January 12, 2018, and (B) June 15– July 24, 2018. Discharge is shown in cubic feet per second. The forecast uncontrolled runoff was greater than the flow target and not computed December 27, 2017–January 6, 2018.

14 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 5,000

4,000 y = 0.9311x + 32.126 R2 = 0.9694

3,000

2,000

New York City Reservoir-measured mean flow, in cubic feet per second

1,000

0 3,500

1,000

2,000

3,000

4,000

5,000

6,000

3,000 2,500 y = 1.0449x + 102.05 R2 = 0.9785

2,000 1,500 1,000 500 0 2,500

500

1,000

1,500

2,000

2,500

3,000

3,500

2,000

y = 0.955x + 27.725 R2 = 0.8813

1,500

1,000

500

1,000

1,500

2,000

2,500

3,000

U.S. Geological Survey-computed mean flow, in cubic feet per second

Figure 10. Graphs showing New York City-measured mean flow, in cubic feet per second, compared with computed mean flow records for U.S. Geological Survey (USGS) streamgaging sites downstream from their respective reservoirs: (A) East Branch Delaware River at Downsville, New York (N.Y.) (site number 01417000), downstream from Pepacton Reservoir (data from USGS, 2019a); (B) West Branch Delaware River at Stilesville, N.Y. (site number 01425000), downstream from Cannonsville Reservoir (data from USGS, 2019b); and (C) Neversink River at Neversink, N.Y. (site number 01436000), downstream from Neversink Reservoir (data from USGS, 2019c), December 1, 2017–November 30, 2018.

Operations 15 Table 12. Characteristics of U.S Geological Survey streamflow gaging stations from which measured streamflow data are compared with Office of the Delaware River Master streamflow data, December 2017–November 2018. [U.S. Geological Survey (USGS) streamflow gaging station records rating of “good” indicates that 95 percent of records are within 10 percent of true discharge, and “fair” indicates that 95 percent of records are within 15 percent of true discharge. %, percent; mi, mile; mi2, square mile]

USGS streamgaging Drainage station name and no. area (mi2)

East Branch Delaware River at Downsville, NY, 01417000 West Branch Delaware River at Stilesville, NY, 01425000 Neversink River at Neversink, NY, 0143600

USGS streamgaging station location

Discharge-type measured

Mean difference 95th percentile between New York of differences Records City and USGS between New York rating reported daily City and USGS streamflow data reported daily (%) streamflow data (%)

372

Releases from Pepacton Reservoir, seepage 0.5 mi downstream from from the dam, and Downsville Dam runoff from 1 mi2 between the dam and station.

Good

5.7

16.2

456

Releases from Cannonsville 1.4 mi downstream from Reservoir and runoff Cannonsville Dam from 2 mi2 between the dam and station.

Fair

5.5

16.8

Good

9.1

31.1

92.6

0.3 mi downstream from Neversink Dam

Releases from Neversink Reservoir and runoff from 0.1 mi2 between the dam and the station.

Conformance of Operations Under the Amended Decree of the Supreme Court of the United States Entered June 7, 1954 From December 1, 2017, to November 30, 2018, operations of the ODRM were conducted as stipulated by the Decree and the FFMP2017 (app. 1). The diversions from the Delaware River Basin to the New York City water supply system did not exceed those authorized by the Decree and the FFMP2017. New York City released water from its reservoirs at rates directed by the

ODRM to meet the applicable Montague flow objectives. During the report year, New York City complied fully with all directives and requests of the ODRM. Diversions from the Delaware River Basin by New Jersey were within limits stipulated by the Decree. New Jersey complied fully with all directives and requests of the ODRM. The Excess Release Quantity was used in support of the IERQ throughout the report year as defined in the FFMP2017 (app. 1; table 10).

16 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Tables 1, 3–10, 13 Table 1. Precipitation in the Delaware River Basin upstream of Montague, New Jersey. [Data from the National Weather Service, New York City Department of Environmental Protection, and Office of the Delaware River Master. in., inch; —, not applicable]

December 2017–November 2018

Monthly average precipitation (in.) December 1940– November 2017

Precipitation (in.)

Percent of average

December

3.50

1.62

January

2.99

February

2.65

March April

Month

Excess (+) or deficit (–) precipitation compared with long-term average Month

Cumulative

–1.88

3.70

124

0.71

–1.17

4.76

179

2.11

0.94

3.35

2.79

–0.56

0.38

3.75

3.72

–0.03

0.34

May

4.17

3.92

–0.25

0.09

June

4.25

3.47

–0.78

–0.69

July

4.27

7.84

184

3.57

2.88

August

4.06

9.36

231

5.30

8.18

September

4.04

8.30

206

4.26

12.44

October

3.75

4.69

125

0.94

13.38

November

3.64

6.22

171

2.58

15.97

Total

44.42

60.39

136

—

Tables 1, 3–10, 13 17 Table 3. Storage in Pepacton Reservoir, New York, for year ending November 30, 2018. [Delaware River Master daily operations record; gage reading at 0800 hours; data provided by New York City Department of Environmental Protection. Storage is given in millions of gallons (Mgal) above the elevation of 1,152.00 feet (ft). Add 7,711 Mgal before June 1st or 7,921 Mgal thereafter for total contents above sill of outlet tunnel at the elevation of 1,126.50 ft. Storage at spillway level is 140,190 Mgal before June 1st and 139,320 Mgal on or after June 1st. —, not applicable; Mgal/d, million gallons per day; ft3/s, cubic foot per second] Day

Dec.

Jan.

Feb.

Mar.

Apr.

May

June

July

Aug.

Sep.

Oct.

Nov.

112,185

107,782

118,579

130,972

131,809

140,597

138,070

130,140

129,740

135,280

135,789

134,100

112,037

107,476

118,495

131,612

132,773

140,542

137,980

129,720

129,880

134,560

136,530

134,030

111,939

107,300

118,293

132,237

133,617

140,468

138,100

129,260

129,910

133,910

137,900

135,390

111,857

107,156

118,124

132,541

134,444

140,616

138,200

128,780

133,710

133,190

138,750

137,210

111,776

107,044

117,972

132,718

135,475

140,634

138,140

128,280

136,240

132,470

139,390

138,100

111,792

106,900

117,770

132,897

136,417

140,579

138,090

127,930

137,450

131,770

139,760

138,710

112,021

106,708

117,551

133,078

137,255

140,505

137,980

127,540

137,830

131,340

139,740

139,480

112,168

106,532

117,434

133,132

137,784

140,579

137,760

127,100

137,880

130,700

139,630

139,740

112,234

106,276

117,199

133,168

138,149

140,542

137,540

126,640

139,320

129,970

139,540

139,870

112,135

105,988

116,830

133,078

138,443

140,431

137,280

126,170

139,960

129,260

139,300

140,240

112,053

105,653

116,763

132,862

138,590

140,653

137,030

125,660

139,890

129,200

139,320

140,220

111,922

105,478

117,484

132,665

138,645

140,486

136,750

125,230

139,960

128,800

139,680

140,070

111,726

107,766

118,208

132,629

138,682

140,449

136,480

124,700

139,720

128,340

139,680

140,000

111,513

109,705

118,748

132,683

138,921

140,357

136,240

124,220

140,740

128,000

139,700

139,960

111,203

110,517

119,240

132,629

139,509

140,227

135,950

123,900

141,350

127,540

139,630

139,830

110,908

111,089

119,987

132,505

140,301

140,412

135,720

123,490

140,940

127,034

139,680

139,830

110,680

111,447

120,855

132,237

141,894

140,486

135,370

123,000

140,400

126,450

139,440

139,680

110,404

111,644

121,643

132,004

141,876

140,653

134,920

122,670

141,530

126,310

139,280

139,550

110,176

111,759

122,138

131,702

141,543

140,690

134,560

122,210

142,180

127,030

139,080

139,430

109,932

111,824

122,877

131,416

141,153

140,968

134,160

121,780

141,480

126,930

138,650

139,350

109,721

111,988

123,739

131,096

140,820

140,857

133,670

121,280

140,920

126,560

138,250

139,210

109,526

112,102

124,603

130,848

140,579

140,634

133,240

120,850

140,370

126,520

137,830

139,080

109,283

112,266

125,175

130,546

140,320

140,431

132,740

120,760

140,010

126,490

137,280

138,870

109,316

114,230

126,149

130,280

140,061

140,320

132,430

121,280

139,720

126,210

136,680

138,670

109,251

115,061

127,250

129,890

139,951

140,171

132,130

121,900

139,320

126,210

136,130

138,800

109,218

115,742

128,761

129,589

140,190

139,969

131,680

125,210

138,840

127,910

135,550

139,080

108,959

116,194

129,731

129,253

140,320

139,767

131,200

127,470

138,380

130,200

134,920

139,960

108,733

116,846

130,457

129,042

140,653

139,712

131,000

129,310

137,810

132,110

134,892

140,290

108,508

117,451

—

128,778

140,727

139,583

130,880

129,950

137,170

133,982

134,749

140,140

108,282

117,888

—

129,095

140,746

139,418

130,550

130,340

136,610

135,060

134,540

139,960

108,040

118,208

—

130,635

—

139,160

—

130,090

135,950

—

134,374

—

Change1

–4,145

+10,426

+11,878

–337

+8,937

–1,437

–7,520

–50

–6,210

–220

–1,415

+5,860

–134

+336

+424

–10.9

+298

–46.4

–251

–1.6

–200

–7.3

–45.6

+195

–207

+520

+656

–16.9

+461

–71.8

–388

–2.5

–310

–11.3

–70.5

+302

2Equivalent

change (Mgal/d) 3Equivalent

change (ft3/s)

1Change is calculated as the storage on the last day of each month minus the storage on the first day of each month. Net change for the year is +27,775 million gallons; minimum and maximum storage for December– May are 105,478 and 141,894 million gallons, respectively; minimum and maximum storage for June–November are 120,760 and 142,180 million gallons, respectively. 2The net equivalent change for the year is +76.1 million gallons per day. 3The net equivalent change for the year is +117 cubic feet per second.

18 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 Table 4. Storage in Cannonsville Reservoir, New York, for year ending November 30, 2018. [Delaware River Master daily operations record; gage reading at 0800 hours; data provided by New York City, Department of Environmental Protection. Storage is given in millions of gallons above the elevation of 1,040.00 feet. Add 2,584 million gallons before June 1st or 2,377 million gallons thereafter for total contents above sill of outlet tunnel at the elevation of 1,020.50 feet. Storage at spillway level is 95,706 before June 1st and 93,448 million gallons on or after June 1st. —, not applicable; Mgal/d, million gallons per day; ft3/s, cubic foot per second] Day

Dec.

Jan.

Feb.

Mar.

Apr.

May

June

July

Aug.

Sep.

Oct.

Nov.

49,866

47,669

69,185

90,016

92,755

96,848

92,973

84,772

83,275

89,570

87,319

84,022

49,725

47,780

69,609

90,351

94,261

96,768

92,851

84,397

83,318

88,991

87,441

83,663

49,562

47,925

69,874

90,640

95,402

96,575

92,622

84,065

83,390

88,443

88,458

84,080

49,375

48,047

70,112

90,686

96,398

96,478

92,409

83,821

84,816

87,897

89,035

85,033

49,189

48,170

70,443

90,579

97,122

96,414

92,181

83,548

86,328

87,368

89,451

85,570

49,037

48,236

70,682

90,397

97,396

96,285

91,923

83,275

87,118

86,840

89,600

86,138

48,959

48,236

70,907

90,199

97,573

96,285

91,636

83,018

87,456

86,357

89,615

86,810

48,826

48,236

71,132

89,956

97,540

96,205

91,515

82,704

87,853

85,847

89,511

87,177

48,781

48,314

71,159

89,667

97,251

96,108

91,200

82,348

88,961

85,265

89,258

87,353

48,703

48,414

71,119

89,302

96,945

96,124

90,854

81,978

89,630

84,714

88,932

87,765

48,614

48,514

71,172

88,921

96,478

96,189

90,510

81,595

89,719

84,686

88,621

88,414

48,526

48,703

71,569

88,465

96,060

96,108

90,166

81,228

90,017

84,512

89,006

88,665

48,414

50,811

72,457

88,328

95,867

96,076

89,779

80,847

90,002

84,166

89,080

88,858

48,359

53,062

72,854

88,632

95,770

96,012

89,451

80,565

89,913

83,893

89,124

89,288

48,114

54,217

73,185

89,028

95,676

95,835

89,065

80,551

90,914

83,333

89,035

89,421

47,814

55,152

73,954

89,362

95,615

95,899

88,724

80,270

91,395

82,716

88,961

89,570

47,591

56,104

75,141

89,651

96,382

95,947

88,340

79,849

91,515

81,964

88,946

89,555

47,336

56,812

76,675

89,910

97,122

95,931

87,853

79,737

92,653

81,482

88,798

89,466

47,069

57,325

77,448

90,153

97,669

95,867

87,500

79,597

95,445

81,638

88,576

89,258

46,958

57,838

78,498

90,382

98,088

96,173

87,147

79,318

95,852

81,553

88,266

89,095

46,924

58,339

80,308

90,549

98,023

96,253

86,810

78,997

95,570

81,411

88,030

88,858

46,858

58,778

81,871

90,655

97,396

96,221

86,415

78,690

95,134

81,638

87,691

88,561

46,780

59,389

83,504

90,762

96,881

96,382

86,021

78,398

94,745

81,950

87,294

88,133

46,869

62,326

84,849

90,640

96,446

96,382

85,715

78,510

94,280

82,063

86,854

87,647

47,202

64,033

86,294

90,382

96,108

96,285

85,497

78,746

93,817

82,134

86,255

87,456

47,469

65,166

88,057

90,153

96,527

96,140

85,265

80,017

93,356

83,361

85,541

87,514

47,447

66,057

89,073

89,910

96,768

96,044

84,917

81,780

92,866

84,368

85,048

88,059

47,347

66,847

89,667

89,499

96,929

96,028

84,758

82,490

92,318

85,120

84,967

88,843

47,269

67,609

—

88,952

96,929

96,044

84,903

82,932

91,561

86,429

84,981

89,273

47,369

68,232

—

88,921

96,848

95,835

84,932

83,132

90,810

87,030

84,772

89,496

47,536

68,762

—

90,944

—

95,523

—

83,233

90,211

—

84,440

—

Change1

–2,330

+21,093

+20,482

+928

+4,093

–1,325

–8,041

–1,539

+6,936

–2,540

–2,879

+5,474

–75.2

+680

+732

+29.9

+136

–42.7

–268

–49.6

+224

–84.7

–92.9

+182

–116

+1,053

+1,132

+46.3

+210

–66.1

–415

–76.7

+347

–131

–144

+282

2Equivalent

change (Mgal/d) 3Equivalent

change (ft3/s)

1Change is calculated as the storage on the last day of each month minus the storage on the first day of each month. Net change for the year is +39,630 million gallons; minimum and maximum storage for December through May are 46,780 and 98,088 million gallons, respectively; minimum and maximum storage for June through November are 78,398 and 95,852 million gallons, respectively. 2The net equivalent change for the year is +109 million gallons per day. 3The net equivalent change for the year is +168 cubic feet per second.

Tables 1, 3–10, 13 19 Table 5. Storage in Neversink Reservoir, New York, for year ending November 30, 2018. [Delaware River Master daily operations record; gage reading at 0800 hours; data provided by New York City, Department of Environmental Protection. Storage is given in millions of gallons above the elevation of 1,319.00 feet. Add 525 million gallons before June 1st or 471 million gallons thereafter for total contents above the sill of outlet tunnel at the elevation of 1,314.00 feet. Storage at spillway level is 34,941 million gallons before June 1st and 34,692 million gallons on or after June 1st. —, not applicable; Mgal/d, million gallons per day; ft3/s, cubic foot per second] Day

Dec.

Jan.

Feb.

Mar.

Apr.

May

June

July

Aug.

Sep.

Oct.

Nov.

31,179

29,083

32,222

35,036

32,288

35,090

34,503

33,247

33,833

34,637

34,895

34,771

31,225

28,690

32,137

35,145

32,496

35,055

34,707

33,228

34,652

34,587

34,846

34,786

31,266

28,381

32,000

35,125

32,496

35,060

34,572

33,199

34,891

34,409

35,031

35,106

31,313

28,084

32,037

35,075

32,596

35,011

34,468

33,121

35,256

34,123

34,921

34,986

31,193

27,783

32,127

35,060

32,962

34,956

34,374

33,088

35,026

33,813

34,891

34,916

31,285

27,460

32,155

34,882

33,211

34,902

34,295

33,068

34,926

33,505

34,836

34,921

31,206

27,159

32,160

34,670

33,437

34,843

34,290

33,063

34,851

33,247

34,821

35,031

31,090

26,970

32,232

34,463

33,591

34,774

34,231

33,030

34,786

32,972

34,811

34,941

31,017

27,000

32,260

34,219

33,736

34,675

34,147

32,996

34,821

32,856

34,801

34,871

31,099

27,000

32,307

33,969

33,639

34,552

34,063

32,962

34,801

32,812

34,791

34,941

31,155

27,031

32,368

33,756

33,751

34,562

33,980

32,938

34,786

33,218

34,771

34,896

31,159

27,094

32,349

33,534

33,872

34,621

33,901

32,870

34,821

33,369

34,961

34,851

31,211

29,369

32,373

33,355

34,008

34,596

33,798

32,832

34,811

33,510

34,891

34,861

31,085

30,396

32,217

33,173

34,204

34,695

33,818

32,793

35,166

33,705

34,836

34,901

30,900

30,693

32,037

32,972

34,557

34,626

33,818

32,769

34,996

33,813

34,821

34,851

30,726

30,914

31,981

32,767

34,818

34,645

33,720

32,740

34,891

33,872

34,821

34,876

30,762

31,132

32,292

32,557

35,369

34,582

33,573

32,707

34,821

33,896

34,811

34,826

30,818

31,299

32,505

32,349

35,199

34,626

33,564

32,687

35,386

34,127

34,781

34,811

30,854

31,425

32,647

32,132

35,135

34,611

33,573

32,649

35,016

34,931

34,771

34,816

30,914

31,560

32,871

31,911

35,095

35,060

33,456

32,601

34,901

34,886

34,776

34,821

30,887

31,681

33,062

31,747

35,075

35,145

33,277

32,562

34,851

34,826

34,766

34,816

30,919

31,808

33,269

31,587

35,090

33,257

32,529

34,816

34,886

34,736

34,776

30,980

31,958

33,331

31,378

35,090

35,070

33,160

32,658

34,836

34,876

34,741

34,751

31,215

33,019

33,360

31,378

35,070

35,026

33,150

33,852

34,806

34,826

34,731

34,756

31,364

33,153

33,693

31,420

35,095

35,026

33,170

34,781

34,786

34,831

34,662

34,861

31,443

33,101

34,340

31,457

35,214

35,006

33,049

35,151

34,766

35,201

34,657

34,911

31,053

33,005

34,660

31,490

35,155

34,961

33,005

34,946

34,756

35,161

34,577

35,096

30,639

32,895

34,892

31,537

35,145

34,764

33,073

34,741

35,055

34,739

34,966

30,236

32,771

—

31,620

35,145

34,705

33,228

34,562

34,721

35,029

34,814

34,886

29,838

32,615

—

31,738

35,115

34,715

33,247

34,340

34,687

34,926

34,814

34,836

29,441

32,386

—

32,056

—

34,778

—

34,098

34,652

—

34,804

—

Change1

–1,738

+3,303

+2,670

–2,980

+2,827

–312

–1,256

+851

+819

+289

–91

+65

–56.1

+107

+95.4

–96.1

+94.2

–10.1

–41.9

+27.5

+26.4

+9.6

–2.9

+2.2

–86.8

+165

+148

–149

+146

–15.6

–64.8

+43.0

+40.8

+14.9

–4.5

+3.4

2Equivalent

change (Mgal/d) 3Equivalent

change (ft3/s)

1Change is calculated as the storage on the last day of each month minus the storage on the first day of each month. Net change for the year +3,657 million gallons; minimum and maximum storage for December–May are 26,970 35,369 million gallons, respectively; minimum and maximum storage for June– November are 35,529 and 35,386 million gallons, respectively. 2The net equivalent change for the year is +10.0 million gallons per day. 3The net equivalent change for the year is +15.5 cubic feet per second.

20 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 Table 6. Diversions to New York City water-supply system for the year ending November 30, 2018. [Delaware River Master daily operations record; data provided by the New York City Department of Environmental Protection. Diversions are in million gallons per day. For December 1–May 31, the average is computed for June 1, 2017, to the given date. For June 1–November 30, the average is computed beginning June 1, 2018, to the given date. The diversion calculation is computed as authorized by the Decree. —, not applicable] Average from 1 June

Date

East Delaware Tunnel

West Delaware Tunnel

Neversink Tunnel

Average from 1 June

609

1/1/2018

451

460

618

609

1/2/2018

302

355

619

300

609

1/3/2018

302

360

619

300

150

609

1/4/2018

302

360

619

204

300

609

1/5/2018

302

359

619

12/6/2017

300

146

608

1/6/2018

302

343

619

12/7/2017

300

203

607

1/7/2018

302

225

619

12/8/2017

180

194

125

607

1/8/2018

441

618

12/9/2017

278

220

606

1/9/2018

451

617

12/10/2017

298

220

606

1/10/2018

451

617

12/11/2017

300

222

605

1/11/2018

451

616

12/12/2017

300

222

605

1/12/2018

450

615

12/13/2017

361

113

154

605

1/13/2018

451

614

12/14/2017

447

221

228

606

1/14/2018

451

614

12/15/2017

421

221

225

608

1/15/2018

451

613

12/16/2017

397

221

608

1/16/2018

451

612

12/17/2017

397

221

608

1/17/2018

451

612

12/18/2017

401

220

608

1/18/2018

451

611

12/19/2017

401

221

608

1/19/2018

451

610

12/20/2017

401

221

608

1/20/2018

304

609

12/21/2017

401

221

608

1/21/2018

303

608

12/22/2017

401

203

608

1/22/2018

303

606

12/23/2017

401

202

608

1/23/2018

303

236

606

12/24/2017

401

607

1/24/2018

446

258

606

12/25/2017

402

606

1/25/2018

302

258

606

12/26/2017

451

192

452

608

1/26/2018

302

258

606

12/27/2017

451

202

452

611

1/27/2018

258

605

12/28/2017

451

202

454

613

1/28/2018

258

603

12/29/2017

451

456

615

1/29/2018

258

602

12/30/2017

451

456

616

1/30/2018

258

600

258

599

9,933

4,762

—

Date

East Delaware Tunnel

West Delaware Tunnel

12/1/2017

302

300

12/2/2017

302

300

12/3/2017

201

12/4/2017

204

12/5/2017

Neversink Tunnel

12/31/2017

451

407

617

1/31/2018

Total

10,514

6,068

3,913

—

Total

Tables 1, 3–10, 13 21 Table 6. Diversions to New York City water-supply system for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record; data provided by the New York City Department of Environmental Protection. Diversions are in million gallons per day. For December 1–May 31, the average is computed for June 1, 2017, to the given date. For June 1–November 30, the average is computed beginning June 1, 2018, to the given date. The diversion calculation is computed as authorized by the Decree. —, not applicable] Date

East Delaware Tunnel

West Delaware Tunnel

Neversink Tunnel

Average from 1 June

Date

East Delaware Tunnel

West Delaware Tunnel

Neversink Tunnel

Average from 1 June

2/1/2018

451

147

599

3/1/2018

580

2/2/2018

451

192

599

3/2/2018

578

2/3/2018

451

598

3/3/2018

576

2/4/2018

451

598

3/4/2018

574

2/5/2018

451

597

3/5/2018

242

573

2/6/2018

451

597

3/6/2018

297

572

2/7/2018

451

596

3/7/2018

303

571

2/8/2018

451

204

596

3/8/2018

300

570

2/9/2018

450

200

597

3/9/2018

147

294

570

2/10/2018

302

200

596

3/10/2018

194

248

569

2/11/2018

200

257

596

3/11/2018

203

259

569

2/12/2018

200

203

595

3/12/2018

202

248

568

2/13/2018

200

258

594

3/13/2018

203

259

568

2/14/2018

201

258

594

3/14/2018

203

259

568

2/15/2018

194

201

255

594

3/15/2018

346

258

568

2/16/2018

202

261

594

3/16/2018

401

258

568

2/17/2018

202

272

593

3/17/2018

401

258

568

2/18/2018

203

272

593

3/18/2018

401

258

569

2/19/2018

203

273

592

3/19/2018

401

258

569

2/20/2018

204

272

252

593

3/20/2018

401

216

569

2/21/2018

208

272

258

593

3/21/2018

401

215

569

2/22/2018

450

258

594

3/22/2018

447

257

570

2/23/2018

150

259

593

3/23/2018

450

168

570

2/24/2018

591

3/24/2018

451

201

570

2/25/2018

589

3/25/2018

451

201

571

2/26/2018

587

3/26/2018

449

200

571

2/27/2018

585

3/27/2018

451

201

571

2/28/2018

583

3/28/2018

450

201

571

Total

6,379

3,250

2,692

—

3/29/2018

451

201

572

3/30/2018

450

571

3/31/2018

450

571

Total

8,404

1,407

4,736

—

22 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 Table 6. Diversions to New York City water-supply system for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record; data provided by the New York City Department of Environmental Protection. Diversions are in million gallons per day. For December 1–May 31, the average is computed for June 1, 2017, to the given date. For June 1–November 30, the average is computed beginning June 1, 2018, to the given date. The diversion calculation is computed as authorized by the Decree. —, not applicable] Date

East Delaware Tunnel

West Delaware Tunnel

4/1/2018

450

4/2/2018

451

4/3/2018

451

4/4/2018

450

182

4/5/2018

451

4/6/2018

Neversink Tunnel

Average from 1 June

Date

East Delaware Tunnel

West Delaware Tunnel

Neversink Tunnel

Average from 1 June

571

5/1/2018

451

562

199

571

5/2/2018

450

562

109

571

5/3/2018

450

116

562

571

5/4/2018

450

116

562

118

571

5/5/2018

450

172

562

451

571

5/6/2018

451

188

562

4/7/2018

451

570

5/7/2018

451

203

562

4/8/2018

451

570

5/8/2018

484

203

563

4/9/2018

451

226

570

5/9/2018

500

203

563

4/10/2018

450

180

570

5/10/2018

219

122

562

4/11/2018

450

219

571

5/11/2018

488

562

4/12/2018

450

570

5/12/2018

502

104

562

4/13/2018

450

570

5/13/2018

460

562

4/14/2018

450

570

5/14/2018

382

121

562

4/15/2018

152

568

5/15/2018

263

203

562

4/16/2018

567

5/16/2018

254

203

561

4/17/2018

380

566

5/17/2018

560

4/18/2018

451

566

5/18/2018

106

559

4/19/2018

450

566

5/19/2018

204

558

4/20/2018

451

115

566

5/20/2018

390

557

4/21/2018

450

566

5/21/2018

450

557

4/22/2018

450

565

5/22/2018

500

557

4/23/2018

450

565

5/23/2018

500

557

4/24/2018

343

564

5/24/2018

499

557

4/25/2018

450

564

5/25/2018

499

117

558

4/26/2018

450

564

5/26/2018

499

128

558

4/27/2018

451

563

5/27/2018

425

252

558

4/28/2018

451

563

5/28/2018

400

558

4/29/2018

451

563

5/29/2018

400

224

558

4/30/2018

451

562

5/30/2018

401

298

559

Total

12,588

699

885

—

5/31/2018

401

299

559

Total

12,443

821

3,069

—

Tables 1, 3–10, 13 23 Table 6. Diversions to New York City water-supply system for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record; data provided by the New York City Department of Environmental Protection. Diversions are in million gallons per day. For December 1–May 31, the average is computed for June 1, 2017, to the given date. For June 1–November 30, the average is computed beginning June 1, 2018, to the given date. The diversion calculation is computed as authorized by the Decree. —, not applicable] Date

East Delaware Tunnel

West Delaware Tunnel

6/1/2018

301

200

6/2/2018

201

Average from 1 June

Date

East Delaware Tunnel

West Delaware Tunnel

501

7/1/2018

450

100

584

258

492

7/2/2018

450

205

586

449

231

589

Neversink Tunnel

Average from 1 June

6/3/2018

201

194

460

7/3/2018

6/4/2018

172

201

165

479

7/4/2018

449

230

592

6/5/2018

203

201

134

491

7/5/2018

449

230

594

6/6/2018

203

201

487

7/6/2018

450

230

597

6/7/2018

298

474

7/7/2018

450

230

599

450

230

601

6/8/2018

301

199

490

7/8/2018

6/9/2018

301

200

502

7/9/2018

450

230

603

6/10/2018

301

200

511

7/10/2018

450

230

605

6/11/2018

301

200

519

7/11/2018

450

200

606

6/12/2018

301

199

526

7/12/2018

450

200

607

6/13/2018

301

199

524

7/13/2018

450

100

606

6/14/2018

301

199

522

7/14/2018

450

602

6/15/2018

298

198

526

7/15/2018

450

601

6/16/2018

298

201

152

534

7/16/2018

449

200

602

541

7/17/2018

450

200

603

6/17/2018

450

201

6/18/2018

450

200

547

7/18/2018

450

200

604

6/19/2018

450

200

105

558

7/19/2018

450

200

605

6/20/2018

450

200

159

570

7/20/2018

450

200

606

6/21/2018

450

200

574

7/21/2018

449

200

607

292

200

605

6/22/2018

450

200

582

7/22/2018

6/23/2018

451

200

585

7/23/2018

594

6/24/2018

449

200

587

7/24/2018

583

6/25/2018

451

200

107

594

7/25/2018

573

6/26/2018

451

200

597

7/26/2018

562

6/27/2018

451

200

599

7/27/2018

204

556

6/28/2018

451

595

7/28/2018

258

551

6/29/2018

450

590

7/29/2018

260

546

6/30/2018

450

585

7/30/2018

451

258

549

Total

10,208

5,235

2,119

—

7/31/2018

450

258

551

Total

10,697

4,145

1,238

—

24 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 Table 6. Diversions to New York City water-supply system for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record; data provided by the New York City Department of Environmental Protection. Diversions are in million gallons per day. For December 1–May 31, the average is computed for June 1, 2017, to the given date. For June 1–November 30, the average is computed beginning June 1, 2018, to the given date. The diversion calculation is computed as authorized by the Decree. —, not applicable] Date

East Delaware Tunnel

West Delaware Tunnel

Neversink Tunnel

Average from 1 June

Date

East Delaware Tunnel

West Delaware Tunnel

Neversink Tunnel

Average from 1 June

8/1/2018

450

251

554

9/1/2018

500

497

8/2/2018

450

552

9/2/2018

500

161

499

8/3/2018

131

546

9/3/2018

500

258

502

8/4/2018

537

9/4/2018

499

258

504

8/5/2018

529

9/5/2018

499

258

507

8/6/2018

375

527

9/6/2018

425

258

509

8/7/2018

450

526

9/7/2018

477

257

511

8/8/2018

450

525

9/8/2018

500

512

8/9/2018

450

524

9/9/2018

501

511

8/10/2018

485

523

9/10/2018

501

511

8/11/2018

500

523

9/11/2018

501

511

8/12/2018

499

522

9/12/2018

501

511

8/13/2018

346

520

9/13/2018

501

511

8/14/2018

302

517

9/14/2018

405

510

8/15/2018

302

514

9/15/2018

401

509

8/16/2018

299

511

9/16/2018

401

508

8/17/2018

253

509

9/17/2018

242

506

8/18/2018

302

506

9/18/2018

203

503

8/19/2018

302

504

9/19/2018

303

501

8/20/2018

302

501

9/20/2018

452

501

8/21/2018

302

499

9/21/2018

501

8/22/2018

302

496

9/22/2018

501

8/23/2018

302

494

9/23/2018

501

8/24/2018

483

494

9/24/2018

172

498

8/25/2018

500

494

9/25/2018

494

8/26/2018

500

494

9/26/2018

489

8/27/2018

500

494

9/27/2018

485

8/28/2018

500

137

496

9/28/2018

481

8/29/2018

499

139

497

9/29/2018

477

8/30/2018

499

497

9/30/2018

473

8/31/2018

500

497

Total

10,487

1,514

—

Total

11,535

276

251

—

Tables 1, 3–10, 13 25 Table 6. Diversions to New York City water-supply system for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record; data provided by the New York City Department of Environmental Protection. Diversions are in million gallons per day. For December 1–May 31, the average is computed for June 1, 2017, to the given date. For June 1–November 30, the average is computed beginning June 1, 2018, to the given date. The diversion calculation is computed as authorized by the Decree. —, not applicable] Date

East Delaware Tunnel

West Delaware Tunnel

Neversink Tunnel

Average from 1 June

Date

East Delaware Tunnel

West Delaware Tunnel

Neversink Tunnel

Average from 1 June

10/1/2018

469

11/1/2018

345

278

437

10/2/2018

466

11/2/2018

199

436

10/3/2018

462

11/3/2018

304

435

10/4/2018

458

11/4/2018

397

435

10/5/2018

455

11/5/2018

397

434

10/6/2018

194

453

11/6/2018

397

434

10/7/2018

193

451

11/7/2018

327

140

434

10/8/2018

193

449

11/8/2018

231

433

10/9/2018

193

447

11/9/2018

199

432

10/10/2018

444

11/10/2018

199

430

10/11/2018

440

11/11/2018

199

429

10/12/2018

437

11/12/2018

289

428

10/13/2018

434

11/13/2018

299

427

10/14/2018

431

11/14/2018

299

426

10/15/2018

427

11/15/2018

299

426

10/16/2018

167

426

11/16/2018

299

425

10/17/2018

199

424

11/17/2018

298

424

10/18/2018

201

422

11/18/2018

299

424

10/19/2018

450

422

11/19/2018

299

423

10/20/2018

450

423

11/20/2018

296

422

10/21/2018

450

423

11/21/2018

199

421

10/22/2018

486

423

11/22/2018

199

419

10/23/2018

497

424

11/23/2018

200

418

10/24/2018

500

162

426

11/24/2018

416

10/25/2018

500

229

428

11/25/2018

414

10/26/2018

511

429

11/26/2018

411

10/27/2018

495

429

11/27/2018

100

410

10/28/2018

500

430

11/28/2018

199

409

10/29/2018

497

210

432

11/29/2018

199

407

10/30/2018

497

279

434

11/30/2018

199

406

10/31/2018

497

279

436

Total

7,199

278

140

—

7,703

1,159

115

—

Total

26 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 Table 7. Consumption of Water by New York City, 1950–2018. [Data provided by New York City, Department of Environmental Protection, Bureau of Water Supply. Mgal/d, million gallons per day]

Average daily consumption Year

Annual consumption (billion gallons)

City proper

Outside communities

Total

(Mgal/d)

1950

953.3

29.1

982.4

358.6

1951

1,041.9

28.1

1,070.0

390.6

1952

1,087.0

32.7

1,119.7

409.8

1953

1,093.9

44.6

1,138.5

415.6

1954

1,063.4

46.3

1,109.7

405.0

1955

1,109.9

45.3

1,155.2

421.6

1956

1,111.3

48.9

1,160.2

424.6

1957

1,169.0

57.2

1,226.2

447.6

1958

1,152.9

49.6

1,202.5

438.9

1959

1,204.3

60.3

1,264.6

461.6

1960

1,199.4

58.9

1,258.3

460.5

1961

1,221.0

64.0

1,285.0

469.0

1962

1,207.6

68.8

1,276.4

465.9

1963

1,218.0

76.7

1,294.7

472.6

1964

1,189.2

79.4

1,268.6

464.3

1965

1,052.1

71.2

1,123.3

410.0

1966

1,044.9

73.2

1,118.1

408.1

1967

1,135.3

71.0

1,206.3

440.3

1968

1,242.0

78.2

1,320.2

483.2

1969

1,328.7

80.1

1,408.8

514.2

1970

1,400.3

90.4

1,490.7

544.1

1971

1,423.6

87.9

1,511.5

551.7

1972

1,412.4

83.0

1,495.4

547.3

1973

1,448.9

95.4

1,544.3

563.7

1974

1,441.8

96.3

1,538.1

561.4

1975

1,415.0

92.1

1,507.1

550.1

1976

1,435.0

95.8

1,530.8

560.3

1977

1,483.0

104.7

1,587.7

579.5

1978

1,479.4

103.0

1,582.4

577.6

1979

1,513.0

104.6

1,617.6

590.4

1980

1,506.3

110.1

1,616.3

591.6

1981

1,309.5

100.0

1,409.5

514.5

1982

1,383.0

104.8

1,487.8

543.1

1983

1,424.2

112.6

1,536.8

561.0

1984

1,465.2

113.9

1,579.1

578.0

1985

1,325.4

106.5

1,431.9

522.7

1986

1,351.1

115.2

1,466.3

535.2

1987

1,447.1

119.8

1,566.9

571.9

1988

1,484.3

125.6

1,609.9

589.1

1989

1,402.0

113.4

1,515.4

553.2

1990

1,424.4

122.4

1,546.8

564.6

Tables 1, 3–10, 13 27 Table 7. Consumption of Water by New York City, 1950–2018.—Continued [Data provided by New York City, Department of Environmental Protection, Bureau of Water Supply. Mgal/d, million gallons per day]

Average daily consumption Year

Annual consumption (billion gallons)

City proper

Outside communities

Total

(Mgal/d)

1991

1,469.9

123.6

1,593.5

581.6

1992

1,368.7

113.9

1,482.6

542.6

1993

1,368.9

118.8

1,487.7

543.0

1994

1,357.8

119.2

1,477.0

539.1

1995

1,326.1

123.1

1,449.2

529.0

1996

1,283.5

120.2

1,403.7

512.4

1997

1,201.3

123.5

1,324.8

483.6

1998

1,220.0

124.7

1,344.7

490.8

1999

1,237.2

128.6

1,365.8

498.5

2000

1,240.4

124.9

1,365.3

499.7

2001

1,184.0

128.4

1,312.4

479.0

2002

1,135.6

121.1

1,256.7

458.7

2003

1,093.7

115.9

1,209.6

441.5

2004

1,099.6

117.5

1,217.1

445.5

2005

1,107.6

123.8

1,231.4

449.5

2006

1,069.2

116.8

1,186.0

432.9

2007

1,114.0

122.9

1,237.0

451.5

2008

1,082.9

114.8

1,197.7

438.4

2009

1,007.2

109.4

1,116.6

407.6

2010

1,039.0

119.0

1,158.0

422.7

2011

1,021.0

116.0

1,137.0

415.0

2012

1,009.1

110.2

1,119.3

409.7

2013

1,006.1

110.1

1,116.2

407.4

2014

996.0

109.6

1,105.6

403.5

2015

1,009.8

114.1

1,123.9

410.2

2016

1,001.6

113.5

1,115.1

408.1

2017

990.2

109.3

1,099.5

401.3

2018

1,006.5

105.9

1,112.4

406.0

28 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 Table 8. Diversions by New Jersey, daily mean discharge, Delaware and Raritan Canal at Port Mercer, New Jersey (U.S. Geological Survey site number 01460440), for the year ending November 30, 2018. [Data from U.S. Geological Survey (2019e). All values except total are in million gallons per day (Mgal/d). Negative values indicate flow into the Delaware River Basin. Total in million gallons, Mgal; e, estimated; —, not applicable]

Day

Dec.

Jan.

Feb.

Mar.

Apr.

May

June

July

Aug.

Sept.

Oct.

Nov.

100

101

100

98e

100

101

100

101

103

100

101

100

94e

100

96e

100

103

100

102

101

104

100

101

–90

100

–122

101

100

—

100

—

Total1

2,781

2,985

2,587

2,843

2,782

2,638

2,929

2,880

2,907

2,658

2,807

2,236

Mean2

89.7

96.3

92.4

91.7

1The year’s total is 33,033 million gallons. 2The combined mean is 90.5 million gallons per day.

92.7

85.1

97.6

92.9

93.8

88.6

90.5

74.5

Table 9. New York City reservoir release design data for the year ending November 30, 2018. [Delaware River Master daily operations record. The Montague design rate was 1,750 ft3/s from December 1, 2017, through January 18, 2018. Column (col.) 1 was provided by electric utility Brookfield Renewable Partners, U.S. Col. 2 was provided by electric utility Eagle Creek Renewable Energy, LLC. Col. 3 computed from recession method. Col. 4 computed increase in runoff based on quantitative precipitation forecasts. Col. 5 = col. 1 + col. 2 + col. 3 + col. 4. Col. 6 = Design rate – col. 5, when positive; otherwise, col. 6 = 0. Col. 7 = col. 14 (4 days earlier). Col. 8, directed release amount from the Office of the Delaware River Master = col. 6 + col. 7, when positive, otherwise col. 8 = 0. Col. 9 = col. 7 from table 10. Col. 10 = summation of col. 9. Col. 11 = flow objective – (col. 9 + col. 10 from table 10) when positive, otherwise col. 11 = 0. Col. 12 = summation of col. 11. Col. 13 = col. 10 – col. 12. Col. 14 = col. 13 divided by –10, limited to ± 50 ft3/s. Cols. 10 and 12 are accumulated from the previous report year starting June 1, 2017, then reset to zero on June 15, 2018. The balancing adjustment standard operating protocol was revised July 15, 2018, to calculate the balancing adjustment only when directed releases are greater than conservation releases, and col. 13 and 14 were set to zero. ft3/s, cubic feet per second; (ft3/s)-d, cubic feet per second accumulated daily] Advance estimate of discharge of Delaware River at Montague, New Jersey, exclusive of New York City reservoir releases Powerplant release forecasts Date of advance estimate

Uncontrolled runoff

Lake Wallenpaupack (ft3/s)

Rio Reservoir (ft3/s)

Current condition (ft3/s)

Weather adjustment (ft3/s)

Col. 1

Col. 2

Col. 3

Col. 4

11/28/2017

1,697

12/1/2017

11/29/2017

1,549

12/2/2017

11/30/2017

1,483

12/1/2017

1,440

12/2/2017

1,400

12/3/2017

12/4/2017

12/5/2017

12/6/2017

Montague date

Discharge (ft3/s)

Col. 5

Computation of balancing adjustment Indicated deficiency

Balancing adjustment

Directed release (ft3/s)

Col. 8

Adjusted directed release

Actual deficiency

Daily (ft3/s)

Cumulative (ft3/s-d)

Daily (ft3/s)

Cumulative (ft3/s-d)

Col. 9

Col. 10

Col. 11

Col. 12

Cumulative difference (ft3/s-d)

Balancing adjustment (ft3/s)

Col. 13

Col. 14

Col. 7

1,750

–50

45,592

40,916

4,676

–50

1,627

123

–50

45,665

103

41,019

4,646

–50

12/3/2017

1,483

267

–50

217

45,882

113

41,132

4,750

–50

12/4/2017

1,440

310

–50

260

46,142

193

41,325

4,817

–50

12/5/2017

1,453

297

–50

247

46,389

243

41,568

4,821

–50

1,400

465

12/6/2017

1,883

–50

46,389

210

41,778

4,611

–50

1,400

840

12/7/2017

2,258

–50

46,389

41,810

4,579

–50

1,360

592

12/8/2017

2,005

–50

46,389

41,810

4,579

–50

1,400

12/9/2017

1,435

315

–50

265

266

46,655

41,816

4,839

–50

12/7/2017

1,400

12/10/2017

1,418

332

–50

282

284

46,939

41,890

5,049

–50

12/8/2017

1,560

12/11/2017

1,560

190

–50

140

47,079

179

42,069

5,010

–50

12/9/2017

1,560

12/12/2017

1,665

–50

47,114

221

42,290

4,824

–50

12/10/2017

1,480

12/13/2017

1,599

151

–50

101

47,215

302

42,592

4,623

–50

12/11/2017

1,394

12/14/2017

1,564

186

–50

136

47,351

42,644

4,707

–50

12/12/2017

1,310

12/15/2017

1,401

349

–50

299

301

47,652

42,644

5,008

–50

12/13/2017

1,240

12/16/2017

1,293

457

–50

407

406

48,058

436

43,080

4,978

–50

12/14/2017

1,195

12/17/2017

1,213

537

–50

487

483

48,541

153

43,233

5,308

–50

12/15/2017

1,230

12/18/2017

1,230

520

–50

470

471

49,012

43,284

5,728

–50

12/16/2017

1,230

12/19/2017

1,230

520

–50

470

471

49,483

43,285

6,198

–50

12/17/2017

1,120

12/20/2017

1,120

630

–50

580

579

50,062

43,304

6,758

–50

12/18/2017

1,240

12/21/2017

1,293

457

–50

407

403

50,465

43,357

7,108

–50

12/19/2017

1,442

12/22/2017

1,460

290

–50

240

50,705

43,385

7,320

–50

12/20/2017

1,490

12/23/2017

1,490

260

–50

210

50,915

43,421

7,494

–50

Tables 1, 3–10, 13 29

Col. 6

[Delaware River Master daily operations record. The Montague design rate was 1,750 ft3/s from December 1, 2017, through January 18, 2018. Column (col.) 1 was provided by electric utility Brookfield Renewable Partners, U.S. Col. 2 was provided by electric utility Eagle Creek Renewable Energy, LLC. Col. 3 computed from recession method. Col. 4 computed increase in runoff based on quantitative precipitation forecasts. Col. 5 = col. 1 + col. 2 + col. 3 + col. 4. Col. 6 = Design rate – col. 5, when positive; otherwise, col. 6 = 0. Col. 7 = col. 14 (4 days earlier). Col. 8, directed release amount from the Office of the Delaware River Master = col. 6 + col. 7, when positive, otherwise col. 8 = 0. Col. 9 = col. 7 from table 10. Col. 10 = summation of col. 9. Col. 11 = flow objective – (col. 9 + col. 10 from table 10) when positive, otherwise col. 11 = 0. Col. 12 = summation of col. 11. Col. 13 = col. 10 – col. 12. Col. 14 = col. 13 divided by –10, limited to ± 50 ft3/s. Cols. 10 and 12 are accumulated from the previous report year starting June 1, 2017, then reset to zero on June 15, 2018. The balancing adjustment standard operating protocol was revised July 15, 2018, to calculate the balancing adjustment only when directed releases are greater than conservation releases, and col. 13 and 14 were set to zero. ft3/s, cubic feet per second; (ft3/s)-d, cubic feet per second accumulated daily] Advance estimate of discharge of Delaware River at Montague, New Jersey, exclusive of New York City reservoir releases Powerplant release forecasts Date of advance estimate

Uncontrolled runoff

Lake Wallenpaupack (ft3/s)

Rio Reservoir (ft3/s)

Current condition (ft3/s)

Weather adjustment (ft3/s)

Col. 1

Col. 2

Col. 3

Col. 4

12/21/2017

1,330

420

12/22/2017

1,310

440

12/23/2017

1,440

310

Montague date

Discharge (ft3/s)

Computation of balancing adjustment Indicated deficiency

Balancing adjustment

Directed release (ft3/s)

Adjusted directed release

Actual deficiency

Daily (ft3/s)

Cumulative (ft3/s-d)

Daily (ft3/s)

Cumulative (ft3/s-d)

Cumulative difference (ft3/s-d)

Balancing adjustment (ft3/s)

Col. 5

Col. 6

Col. 7

Col. 8

Col. 9

Col. 10

Col. 11

Col. 12

Col. 13

Col. 14

12/24/2017

1,750

–50

50,915

43,421

7,494

–50

12/25/2017

1,750

–50

50,915

43,421

7,494

–50

12/26/2017

1,750

–50

50,915

43,421

7,494

–50

The estimated Montague discharge was greater than the Montague design rate from 12/27/2017 to 01/6/2018 1/4/2018

339

567

733

1/7/2018

1,639

111

–50

107

51,022

43,421

7,601

–50

1/5/2018

339

1/6/2018

124

837

1/8/2018

1,300

450

–50

400

398

51,420

43,421

7,999

–50

1,299

1/9/2018

1,299

451

–50

401

51,821

43,421

8,400

1/7/2018

–50

1,750

1/10/2018

1,750

–50

186

52,007

43,421

8,586

–50

1/8/2018

1,679

1/11/2018

1,750

–50

52,007

116

43,537

8,470

–50

1/9/2018

1,590

160

1/12/2018

1,750

–50

52,007

43,537

8,470

–50

The estimated Montague discharge was greater than the Montague design rate from 1/13/2018 to 6/14/2018 6/13/2018

226

1,497

6/14/2018

108

1,415

6/15/2018

382

1,431

6/16/2018

452

1,116

6/17/2018

382

6/18/2018

247

6/19/2018

247

6/20/2018

6/16/2018

1,796

–18

6/17/2018

1,523

6/18/2018

1,830

227

373

391

–164

227

490

–263

6/19/2018

1,605

145

372

522

–150

1,309

127

6/20/2018

1,818

372

124

646

–274

1,149

1,199

281

6/21/2018

1,677

461

248

894

–433

6/22/2018

1,486

264

290

751

348

1,242

–491

208

1,176

6/23/2018

1,506

244

259

1,010

399

1,641

–631

6/21/2018

6/22/2018

108

1,208

231

6/24/2018

1,439

311

338

1,348

548

2,189

–841

1,172

238

6/25/2018

1,518

232

275

1,348

296

2,485

–1137

6/23/2018

108

1,084

399

6/26/2018

1,591

159

208

1,348

2,485

–1137

6/24/2018

108

1,067

435

6/27/2018

1,610

140

190

1,348

106

2,591

–1243

30 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Table 9. New York City reservoir release design data for the year ending November 30, 2018.—Continued

Table 9. New York City reservoir release design data for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record. The Montague design rate was 1,750 ft3/s from December 1, 2017, through January 18, 2018. Column (col.) 1 was provided by electric utility Brookfield Renewable Partners, U.S. Col. 2 was provided by electric utility Eagle Creek Renewable Energy, LLC. Col. 3 computed from recession method. Col. 4 computed increase in runoff based on quantitative precipitation forecasts. Col. 5 = col. 1 + col. 2 + col. 3 + col. 4. Col. 6 = Design rate – col. 5, when positive; otherwise, col. 6 = 0. Col. 7 = col. 14 (4 days earlier). Col. 8, directed release amount from the Office of the Delaware River Master = col. 6 + col. 7, when positive, otherwise col. 8 = 0. Col. 9 = col. 7 from table 10. Col. 10 = summation of col. 9. Col. 11 = flow objective – (col. 9 + col. 10 from table 10) when positive, otherwise col. 11 = 0. Col. 12 = summation of col. 11. Col. 13 = col. 10 – col. 12. Col. 14 = col. 13 divided by –10, limited to ± 50 ft3/s. Cols. 10 and 12 are accumulated from the previous report year starting June 1, 2017, then reset to zero on June 15, 2018. The balancing adjustment standard operating protocol was revised July 15, 2018, to calculate the balancing adjustment only when directed releases are greater than conservation releases, and col. 13 and 14 were set to zero. ft3/s, cubic feet per second; (ft3/s)-d, cubic feet per second accumulated daily] Advance estimate of discharge of Delaware River at Montague, New Jersey, exclusive of New York City reservoir releases Powerplant release forecasts Date of advance estimate

Uncontrolled runoff

Lake Wallenpaupack (ft3/s)

Rio Reservoir (ft3/s)

Current condition (ft3/s)

Weather adjustment (ft3/s)

Col. 1

Col. 2

Col. 3

Col. 4

6/25/2018

108

1,202

6/26/2018

108

6/27/2018

391

6/28/2018

491

6/29/2018 6/30/2018

Montague date

Discharge (ft3/s)

Col. 5

Computation of balancing adjustment Indicated deficiency

Col. 6

Balancing adjustment

Col. 7

Directed release (ft3/s)

Col. 8

Adjusted directed release

Actual deficiency

Cumulative difference (ft3/s-d)

Balancing adjustment (ft3/s)

Daily (ft3/s)

Cumulative (ft3/s-d)

Daily (ft3/s)

Cumulative (ft3/s-d)

Col. 9

Col. 10

Col. 11

Col. 12

Col. 13

Col. 14

The estimated Montague discharge was greater than the Montague design rate from 1/13/2018 to 6/14/2018—Continued 6/28/2018

1,616

134

184

1,532

2,591

–1059

1,286

614

6/29/2018

2,008

1,532

2,591

–1059

1,431

2,459

6/30/2018

4,281

1,532

2,591

–1059

1,750

129

7/1/2018

2,370

1,532

2,591

–1059

516

1,750

7/2/2018

2,266

1,532

2,591

–1059

545

284

2,097

7/3/2018

2,926

1,532

2,591

–1059

7/1/2018

545

160

2,024

100

7/4/2018

2,829

1,532

2,591

–1059

7/2/2018

446

1,678

749

7/5/2018

2,962

1,532

2,591

–1059

7/3/2018

348

124

1,447

227

7/6/2018

2,146

1,532

221

2,812

–1280

7/4/2018

391

1,140

1,120

7/7/2018

2,686

1,532

176

2,988

–1456

7/5/2018

168

120

935

869

7/8/2018

2,092

1,532

204

3,192

–1660

7/6/2018

168

100

1,157

7/9/2018

1,445

305

355

1,887

529

3,721

–1834

7/7/2018

140

155

1,040

7/10/2018

1,335

415

465

2,352

569

4,290

–1938

7/8/2018

140

192

1,035

7/11/2018

1,380

370

420

2,772

527

4,817

–2045

7/9/2018

140

1,083

7/12/2018

1,353

397

447

3,219

529

5,346

–2127

7/10/2018

140

258

875

7/13/2018

1,309

441

491

3,710

479

5,825

–2115

7/11/2018

373

313

929

7/14/2018

1,615

135

185

3,895

218

6,043

–2148

7/12/2018

272

331

953

7/15/2018

1,576

174

224

4,119

258

6,301

–2182

7/13/2018

405

479

808

266

7/16/2018

1,958

238

7/14/2018

391

516

771

382

7/17/2018

2,060

238

7/15/2018

140

516

727

508

7/18/2018

1,891

209

7/16/2018

140

516

855

466

7/19/2018

1,977

478

Tables 1, 3–10, 13 31

306

Uncontrolled runoff

Lake Wallenpaupack (ft3/s)

Rio Reservoir (ft3/s)

Current condition (ft3/s)

Weather adjustment (ft3/s)

Col. 1

Col. 2

Col. 3

Col. 4

7/17/2018

140

368

665

7/18/2018

376

450

7/19/2018

140

100

7/20/2018

140

7/21/2018 7/22/2018 7/23/2018

Montague date

Discharge (ft3/s)

Col. 5

Computation of balancing adjustment Indicated deficiency

Col. 6

Balancing adjustment

Col. 7

Directed release (ft3/s)

Col. 8

Adjusted directed release

Actual deficiency

Cumulative difference (ft3/s-d)

Balancing adjustment (ft3/s)

Daily (ft3/s)

Cumulative (ft3/s-d)

Daily (ft3/s)

Cumulative (ft3/s-d)

Col. 9

Col. 10

Col. 11

Col. 12

Col. 13

Col. 14

701

The estimated Montague discharge was greater than the Montague design rate from 1/13/2018 to 6/14/2018—Continued 242

7/20/2018

1,415

335

660

7/21/2018

1,486

264

611

875

7/22/2018

1,213

537

861

192

660

780

7/23/2018

1,772

140

248

500

1,440

7/24/2018

2,328

140

199

450

891

7/25/2018

1,680

140

117

—

11,782

7/26/2018

12,039

The estimated Montague discharge was greater than the Montague design rate from 7/27/2018 to 11/30/2018

32 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Table 9. New York City reservoir release design data for the year ending November 30, 2018.—Continued

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018. [Delaware River Master daily operations record. All provided measurements are the mean discharge in cubic feet per second (ft3/s) for 24 hours. Column (col.) 1 = Office of the Delaware River Master directed release. Col. 2 = 24 hours beginning 1200 of date shown. Col. 3 = 24 hours ending 2400, 1 day later. Col. 4 = 24 hours beginning 1500, 1 day later. Col 5 = 24 hours beginning 0000 of date shown. Col. 6 = 24 hours beginning 1600 of the date shown. Col. 7 = col. 2 + col. 3 + col. 4 in response to direction (col. 1). Col. 8 = col. 2 + col. 3 + col. 4 – col. 7. Col. 9 = col. 5 + col. 6. Col. 10 = col. 11 – col. 7 – col. 8 – col. 9. Col. 11 = 24 hours of calendar day shown. Col. 12 = Interim Excess Release Quantity (IERQ) bank releases. Th, thermal IERQ bank; —, not applicable] Controlled releases from powerplant reservoirs

Controlled releases from New York City Reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Date

11/28/17

Controlled releases Pepacton

Cannonsville

Neversink

Col. 1

Col. 2

Col. 3

Col. 4

153

Amount

Date

11/30/17

Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Date

12/1/17

New York City reservoirs

Powerplants

Computed uncontrolled

Total

IERQ bank releases

Directed

Other

Col. 7

Col. 8

Col. 9

Col. 10

Col. 11

Col. 12

293

1,604

1,950

0 0

11/29/17

153

12/1/17

12/2/17

220

1,612

1,940

11/30/17

217

153

12/2/17

12/3/17

217

1,619

1,930

12/1/17

260

153

12/3/17

12/4/17

260

1,557

1,850

12/2/17

247

153

12/4/17

12/5/17

247

1,507

1,800

12/3/17

150

12/5/17

12/6/17

290

1,529

1,830

12/4/17

152

12/6/17

12/7/17

292

1,692

2,010

12/5/17

150

12/7/17

12/8/17

273

1,839

2,130

12/6/17

265

150

12/8/17

12/9/17

266

1,684

2,010

12/7/17

282

150

12/9/17

12/10/17

284

1,605

1,960

12/8/17

140

150

12/10/17

12/11/17

140

149

1,571

1,860

12/9/17

152

12/11/17

12/12/17

256

1,486

1,820

12/10/17

101

152

12/12/17

12/13/17

101

191

1,448

1,740

12/11/17

136

152

12/13/17

284

12/14/17

136

156

311

1,387

1,990

12/12/17

299

161

12/14/17

390

12/15/17

301

390

1,469

2,160

12/13/17

407

266

12/15/17

124

12/16/17

406

124

1,190

1,720

12/14/17

487

343

12/16/17

12/17/17

483

1,562

2,080

12/15/17

470

331

12/17/17

12/18/17

471

1,699

2,170

12/16/17

470

331

12/18/17

12/19/17

471

1,742

2,220

580

439

12/19/17

12/20/17

579

1,713

2,310

407

263

12/20/17

12/21/17

403

1,690

2,100

12/19/17

240

136

12/21/17

12/22/17

240

1,658

1,990

12/20/17

210

136

12/22/17

12/23/17

210

1,679

1,980

12/21/17

136

12/23/17

12/24/17

266

2,854

3,120

12/22/17

136

12/24/17

12/25/17

266

3,924

4,190

12/23/17

136

12/25/17

12/26/17

266

2,946

3,230

Tables 1, 3–10, 13 33

12/17/17 12/18/17

[Delaware River Master daily operations record. All provided measurements are the mean discharge in cubic feet per second (ft3/s) for 24 hours. Column (col.) 1 = Office of the Delaware River Master directed release. Col. 2 = 24 hours beginning 1200 of date shown. Col. 3 = 24 hours ending 2400, 1 day later. Col. 4 = 24 hours beginning 1500, 1 day later. Col 5 = 24 hours beginning 0000 of date shown. Col. 6 = 24 hours beginning 1600 of the date shown. Col. 7 = col. 2 + col. 3 + col. 4 in response to direction (col. 1). Col. 8 = col. 2 + col. 3 + col. 4 – col. 7. Col. 9 = col. 5 + col. 6. Col. 10 = col. 11 – col. 7 – col. 8 – col. 9. Col. 11 = 24 hours of calendar day shown. Col. 12 = Interim Excess Release Quantity (IERQ) bank releases. Th, thermal IERQ bank; —, not applicable] Controlled releases from powerplant reservoirs

Controlled releases from New York City Reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Date

Controlled releases

Amount Col. 1

Pepacton

Cannonsville

Neversink

Col. 2

Col. 3

Col. 4

Date

Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Date

New York City reservoirs Directed

Other

Col. 7

Col. 8

Powerplants

Computed uncontrolled

Total

Col. 9

Col. 10

Col. 11

IERQ bank releases

Col. 12

12/24/17

138

12/26/17

319

12/27/17

268

319

2,073

2,660

12/25/17

136

12/27/17

851

12/28/17

266

851

1,653

2,770

12/26/17

135

12/28/17

798

12/29/17

265

798

1,417

2,480

12/27/17

135

12/29/17

674

12/30/17

265

674

1,371

2,310

12/28/17

135

12/30/17

674

12/31/17

265

674

1,371

2,310

12/29/17

135

12/31/17

851

1/1/18

265

851

1,304

2,420

12/30/17

135

1/1/18

851

1/2/18

265

851

1,414

2,530

12/31/17

135

1/2/18

780

1/3/18

265

780

1,565

2,610

1/1/18

136

1/3/18

745

1/4/18

266

745

1,749

2,760

1/2/18

135

1/4/18

816

1/5/18

265

816

2,709

3,790

1/3/18

136

1/5/18

353

851

1/6/18

266

1,204

2,440

3,910

1/4/18

181

1/6/18

355

851

1/7/18

107

140

1,206

2,253

3,770

1/5/18

400

268

1/7/18

361

727

1/8/18

398

1,088

1,404

2,890

0 0

1/6/18

401

271

1/8/18

230

1/9/18

401

230

1,809

2,440

1/7/18

226

1/9/18

1/10/18

186

710

1,787

2,150

1/8/18

136

1/10/18

1/11/18

266

1,634

1,900

1/9/18

136

1/11/18

1/12/18

266

3,244

3,510

1/10/18

136

1/12/18

1/13/18

266

12,645

13,000

1/11/18

136

1/13/18

833

1/14/18

266

833

15,401

16,500

1/12/18

136

1/14/18

851

1/15/18

266

851

8,863

9,980

1/13/18

136

1/15/18

350

461

1/16/18

266

811

6,203

7,280

1/14/18

136

1/16/18

364

301

1/17/18

266

665

5,619

6,550

1/15/18

138

1/17/18

749

390

1/18/18

268

1,139

5,463

6,870

1/16/18

138

1/18/18

1,265

160

1/19/18

268

1,425

4,377

6,070

1/17/18

138

1/19/18

1,238

1/20/18

268

1,238

3,444

4,950

1/18/18

142

1/20/18

1/21/18

276

3,854

4,130

34 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record. All provided measurements are the mean discharge in cubic feet per second (ft3/s) for 24 hours. Column (col.) 1 = Office of the Delaware River Master directed release. Col. 2 = 24 hours beginning 1200 of date shown. Col. 3 = 24 hours ending 2400, 1 day later. Col. 4 = 24 hours beginning 1500, 1 day later. Col 5 = 24 hours beginning 0000 of date shown. Col. 6 = 24 hours beginning 1600 of the date shown. Col. 7 = col. 2 + col. 3 + col. 4 in response to direction (col. 1). Col. 8 = col. 2 + col. 3 + col. 4 – col. 7. Col. 9 = col. 5 + col. 6. Col. 10 = col. 11 – col. 7 – col. 8 – col. 9. Col. 11 = 24 hours of calendar day shown. Col. 12 = Interim Excess Release Quantity (IERQ) bank releases. Th, thermal IERQ bank; —, not applicable] Controlled releases from powerplant reservoirs

Controlled releases from New York City Reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Controlled releases Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Pepacton

Cannonsville

Neversink

Col. 1

Col. 2

Col. 3

Col. 4

1/19/18

153

1/21/18

1/20/18

153

1/22/18

250

124

1/21/18

152

1/23/18

243

1/22/18

150

1/24/18

1/23/18

152

1/25/18

1/24/18

152

110

1/26/18

Date

Amount

Date

New York City reservoirs

IERQ bank releases

Powerplants

Computed uncontrolled

Total

Col. 9

Col. 10

Col. 11

Col. 12

Directed

Other

Col. 7

Col. 8

1/22/18

292

3,818

4,110

1/23/18

293

374

5,553

6,220

426

1/24/18

292

669

20,039

21,000

245

230

1/25/18

290

475

13,735

14,500

555

106

1/26/18

306

661

9,233

10,200

641

1/27/18

342

641

6,947

7,930

1/25/18

167

110

1/27/18

1/28/18

361

6,358

6,790

1/26/18

178

110

1/28/18

1/29/18

387

5,880

6,320

1/27/18

167

110

1/29/18

471

1/30/18

376

471

5,183

6,030

1/28/18

101

189

110

1/30/18

789

1/31/18

400

878

4,402

5,680

1/29/18

101

178

110

1/31/18

782

195

2/1/18

389

977

3,504

4,870

1/30/18

101

176

110

2/1/18

464

301

2/2/18

387

765

3,528

4,680

1/31/18

101

176

110

2/2/18

592

479

2/3/18

387

1,071

2,932

4,390

2/1/18

101

181

110

2/3/18

252

142

2/4/18

392

394

2,374

3,160

2/2/18

101

178

110

2/4/18

2/5/18

389

2,870

3,330

2/3/18

101

179

110

2/5/18

596

124

2/6/18

390

720

2,780

3,890

2/4/18

101

178

110

2/6/18

590

160

2/7/18

389

750

2,591

3,730

2/5/18

178

110

2/7/18

627

2/8/18

387

680

2,883

3,950

2/6/18

101

172

110

2/8/18

676

213

2/9/18

383

889

3,458

4,730

101

173

110

2/9/18

700

337

2/10/18

384

1,037

3,009

4,430

101

175

110

2/10/18

319

2/11/18

386

319

3,005

3,710

2/9/18

101

175

110

2/11/18

355

2/12/18

386

355

5,299

6,040

2/10/18

175

110

2/12/18

849

426

2/13/18

384

1,275

6,111

7,770

2/11/18

101

176

110

2/13/18

1,074

532

2/14/18

387

1,606

5,537

7,530

2/12/18

101

175

110

2/14/18

1,135

550

2/15/18

386

1,685

5,539

7,610

2/13/18

101

170

110

2/15/18

1,657

550

2/16/18

381

2,207

7,912

10,500

Tables 1, 3–10, 13 35

2/7/18 2/8/18

Controlled releases from powerplant reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Controlled releases Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Pepacton

Cannonsville

Neversink

Col. 1

Col. 2

Col. 3

Col. 4

2/14/18

101

173

110

2/16/18

1,488

550

2/15/18

101

176

110

2/17/18

1,631

550

2/16/18

101

176

110

2/18/18

1,632

2/17/18

101

176

110

2/19/18

2/18/18

101

176

110

2/20/18

2/19/18

101

179

127

2/20/18

101

179

2/21/18

101

178

2/22/18

101

2/23/18

2/24/18

2/25/18

Date

Amount

Date

New York City reservoirs

Powerplants

Computed uncontrolled

Total

IERQ bank releases

Directed

Other

Col. 7

Col. 8

Col. 9

Col. 10

Col. 11

Col. 12

2/17/18

384

2,038

12,278

14,700

2/18/18

387

2,181

9,732

12,300

727

2/19/18

387

2,359

7,654

10,400

1,630

745

2/20/18

387

2,375

9,138

11,900

1,629

745

2/21/18

387

2,374

14,339

17,100

2/21/18

1,452

851

2/22/18

407

2,303

15,790

18,500

190

2/22/18

1,421

851

2/23/18

470

2,272

14,958

17,700

189

2/23/18

1,446

851

2/24/18

468

2,297

13,835

16,600

261

190

2/24/18

1,447

851

2/25/18

552

2,298

20,650

23,500

234

674

190

2/25/18

1,470

851

2/26/18

1,098

2,321

26,381

29,800

405

1,052

190

2/26/18

1,567

851

2/27/18

1,647

2,418

17,635

21,700

602

1,355

190

2/27/18

1,630

851

2/28/18

2,147

2,481

12,772

17,400

2/26/18

699

1,497

190

2/28/18

1,632

851

3/1/18

2,386

2,483

10,231

15,100

2/27/18

696

1,499

190

3/1/18

1,264

851

3/2/18

2,385

2,115

12,800

17,300

2/28/18

699

1,502

190

3/2/18

492

851

3/3/18

2,391

1,343

14,466

18,200

3/1/18

699

1,501

190

3/3/18

500

851

3/4/18

2,390

1,351

11,159

14,900

3/2/18

699

1,491

190

3/4/18

501

851

3/5/18

2,380

1,352

9,268

13,000

3/3/18

699

1,493

190

3/5/18

500

851

3/6/18

2,382

1,351

7,867

11,600

3/4/18

699

1,493

189

3/6/18

500

851

3/7/18

2,381

1,351

7,568

11,300

3/5/18

699

1,496

189

3/7/18

495

762

3/8/18

2,384

1,257

7,659

11,300

3/6/18

699

1,496

190

3/8/18

1,106

301

3/9/18

2,385

1,407

6,308

10,100

3/7/18

699

1,496

190

3/9/18

594

3/10/18

2,385

594

5,281

8,260

3/8/18

699

1,496

190

3/10/18

3/11/18

2,385

5,175

7,560

3/9/18

699

1,491

167

3/11/18

319

3/12/18

2,357

319

5,394

8,070

3/10/18

670

1,298

190

3/12/18

882

479

3/13/18

2,158

1,361

4,761

8,280

3/11/18

664

947

110

3/13/18

1,161

426

3/14/18

1,721

1,587

3,992

7,300

36 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record. All provided measurements are the mean discharge in cubic feet per second (ft3/s) for 24 hours. Column (col.) 1 = Office of the Delaware River Master directed release. Col. 2 = 24 hours beginning 1200 of date shown. Col. 3 = 24 hours ending 2400, 1 day later. Col. 4 = 24 hours beginning 1500, 1 day later. Col 5 = 24 hours beginning 0000 of date shown. Col. 6 = 24 hours beginning 1600 of the date shown. Col. 7 = col. 2 + col. 3 + col. 4 in response to direction (col. 1). Col. 8 = col. 2 + col. 3 + col. 4 – col. 7. Col. 9 = col. 5 + col. 6. Col. 10 = col. 11 – col. 7 – col. 8 – col. 9. Col. 11 = 24 hours of calendar day shown. Col. 12 = Interim Excess Release Quantity (IERQ) bank releases. Th, thermal IERQ bank; —, not applicable] Controlled releases from powerplant reservoirs

Controlled releases from New York City Reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Date

Controlled releases

Amount Col. 1

Pepacton

Cannonsville

Neversink

Col. 2

Col. 3

Col. 4

Date

Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Date

New York City reservoirs Directed

Other

Col. 7

Col. 8

Powerplants

Computed uncontrolled

Total

Col. 9

Col. 10

Col. 11

IERQ bank releases

Col. 12

3/12/18

330

933

110

3/14/18

1,134

426

3/15/18

1,373

1,560

3,637

6,570

3/13/18

300

173

110

3/15/18

1,157

443

3/16/18

583

1,600

4,107

6,290

3/14/18

300

175

110

3/16/18

1,083

461

3/17/18

585

1,544

3,361

5,490

3/15/18

300

176

110

3/17/18

408

3/18/18

586

408

3,556

4,550

3/16/18

300

175

110

3/18/18

426

3/19/18

585

426

3,869

4,880

3/17/18

300

175

110

3/19/18

786

603

3/20/18

585

1,389

3,256

5,230

3/18/18

300

176

110

3/20/18

846

337

3/21/18

586

1,183

2,921

4,690

3/19/18

300

206

3/21/18

820

3/22/18

583

909

3,048

4,540

3/20/18

246

305

3/22/18

834

248

3/23/18

625

1,082

2,933

4,640

0 0

3/21/18

231

306

3/23/18

848

106

3/24/18

611

954

2,545

4,110

3/22/18

232

367

3/24/18

3/25/18

673

3,177

3,850

3/23/18

232

543

3/25/18

142

3/26/18

849

142

3,479

4,470

3/24/18

232

551

3/26/18

851

177

3/27/18

857

1,028

3,195

5,080

234

546

3/27/18

834

3/28/18

854

834

3,542

5,230

232

721

3/28/18

849

3/29/18

1,027

920

5,143

7,090

3/27/18

232

1,235

3/29/18

361

3/30/18

1,541

450

6,779

8,770

3/28/18

232

1,227

3/30/18

266

3/31/18

1,533

266

12,001

13,800

3/29/18

232

1,131

3/31/18

4/1/18

1,437

10,263

11,700

3/30/18

119

433

4/1/18

337

4/2/18

626

337

9,837

10,800

3/31/18

101

377

4/2/18

567

4/3/18

552

567

9,781

10,900

4/1/18

101

470

4/3/18

316

567

4/4/18

645

883

12,472

14,000

4/2/18

101

786

4/4/18

572

603

4/5/18

961

1,175

13,764

15,900

4/3/18

101

1,423

4/5/18

1,417

603

4/6/18

1,598

2,020

10,682

14,300

4/4/18

101

1,496

4/6/18

1,299

603

4/7/18

1,671

1,902

8,627

12,200

4/5/18

101

1,497

4/7/18

603

4/8/18

1,672

603

8,725

11,000

4/6/18

156

1,496

4/8/18

603

4/9/18

1,726

603

7,871

10,200

Tables 1, 3–10, 13 37

3/25/18 3/26/18

Controlled releases from New York City Reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Date

Controlled releases

Amount Col. 1

Pepacton

Cannonsville

Neversink

Col. 2

Col. 3

Col. 4

Date

Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Date

New York City reservoirs Directed

Other

Col. 7

Col. 8

Powerplants

Computed uncontrolled

Total

Col. 9

Col. 10

Col. 11

IERQ bank releases

Col. 12

4/7/18

192

1,494

4/9/18

767

603

4/10/18

1,760

1,370

6,300

9,430

4/8/18

192

1,494

4/10/18

753

603

4/11/18

1,760

1,356

5,424

8,540

4/9/18

192

1,494

4/11/18

276

550

4/12/18

1,760

826

4,604

7,190

4/10/18

192

1,485

4/12/18

496

4/13/18

1,751

496

4,483

6,730

4/11/18

193

1,485

4/13/18

408

4/14/18

1,752

408

4,300

6,460

4/12/18

193

1,490

4/14/18

301

4/15/18

1,757

301

4,612

6,670

4/13/18

192

1,502

4/15/18

461

4/16/18

1,768

461

6,901

9,130

4/14/18

192

1,508

4/16/18

829

585

4/17/18

1,782

1,414

15,404

18,600

4/15/18

201

1,504

120

4/17/18

824

621

4/18/18

1,825

1,445

14,930

18,200

4/16/18

223

1,439

176

4/18/18

1,139

603

4/19/18

1,838

1,742

11,820

15,400

4/17/18

845

110

4/19/18

1,154

603

4/20/18

1,009

1,757

10,234

13,000

4/18/18

289

331

110

4/20/18

603

4/21/18

730

603

9,567

10,900

4/19/18

674

226

110

4/21/18

426

4/22/18

1,010

426

8,764

10,200

4/20/18

696

1,231

110

4/22/18

390

4/23/18

2,037

390

7,003

9,430

4/21/18

696

1,493

110

4/23/18

747

284

4/24/18

2,299

1,031

5,450

8,780

4/22/18

696

1,493

128

4/24/18

1,137

142

4/25/18

2,317

1,279

5,354

8,950

4/23/18

696

1,493

142

4/25/18

1,306

4/26/18

2,331

1,395

7,374

11,100

4/24/18

696

1,493

158

4/26/18

208

4/27/18

2,347

297

8,356

11,000

4/25/18

696

1,494

158

4/27/18

177

4/28/18

2,348

177

8,775

11,300

0 0

4/26/18

696

1,493

164

4/28/18

4/29/18

2,353

8,647

11,000

4/27/18

696

1,493

162

4/29/18

4/30/18

2,351

7,760

10,200

4/28/18

696

1,494

167

4/30/18

5/1/18

2,357

7,370

9,780

4/29/18

696

1,493

172

5/1/18

322

230

5/2/18

2,361

552

6,777

9,690

4/30/18

696

1,497

172

5/2/18

324

5/3/18

2,365

413

6,342

9,120

5/1/18

696

1,504

172

5/3/18

1,004

106

5/4/18

2,372

1,110

5,148

8,630

5/2/18

577

1,502

172

5/4/18

633

5/5/18

2,251

722

4,337

7,310

38 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record. All provided measurements are the mean discharge in cubic feet per second (ft3/s) for 24 hours. Column (col.) 1 = Office of the Delaware River Master directed release. Col. 2 = 24 hours beginning 1200 of date shown. Col. 3 = 24 hours ending 2400, 1 day later. Col. 4 = 24 hours beginning 1500, 1 day later. Col 5 = 24 hours beginning 0000 of date shown. Col. 6 = 24 hours beginning 1600 of the date shown. Col. 7 = col. 2 + col. 3 + col. 4 in response to direction (col. 1). Col. 8 = col. 2 + col. 3 + col. 4 – col. 7. Col. 9 = col. 5 + col. 6. Col. 10 = col. 11 – col. 7 – col. 8 – col. 9. Col. 11 = 24 hours of calendar day shown. Col. 12 = Interim Excess Release Quantity (IERQ) bank releases. Th, thermal IERQ bank; —, not applicable] Controlled releases from powerplant reservoirs

Controlled releases from New York City Reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Date

Controlled releases

Amount Col. 1

Pepacton

Cannonsville

Neversink

Col. 2

Col. 3

Col. 4

Date

Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Date

New York City reservoirs Directed

Other

Col. 7

Col. 8

Powerplants

Computed uncontrolled

Total

Col. 9

Col. 10

Col. 11

IERQ bank releases

Col. 12

5/3/18

541

1,504

166

5/5/18

5/6/18

2,211

4,609

6,820

5/4/18

541

1,502

108

5/6/18

5/7/18

2,151

5,281

7,450

5/5/18

541

1,502

102

5/7/18

142

5/8/18

2,145

142

5,333

7,620

5/6/18

541

1,502

5/8/18

5/9/18

2,142

4,483

6,660

5/7/18

285

1,392

101

5/9/18

622

106

5/10/18

1,778

728

4,094

6,600

5/8/18

265

1,098

101

5/10/18

698

106

5/11/18

1,464

804

4,162

6,430

5/9/18

300

1,032

5/11/18

347

106

5/12/18

1,431

453

4,226

6,110

5/10/18

300

1,032

101

5/12/18

142

5/13/18

1,433

142

4,785

6,360

5/11/18

300

1,032

101

5/13/18

177

5/14/18

1,433

177

5,360

6,970

5/12/18

300

1,032

101

5/14/18

830

248

5/15/18

1,433

1,078

5,699

8,210

5/13/18

300

1,032

101

5/15/18

1,416

390

5/16/18

1,433

1,806

7,161

10,400

5/14/18

300

869

101

5/16/18

874

5/17/18

1,270

909

8,221

10,400

5/15/18

300

730

101

5/17/18

694

5/18/18

1,131

694

6,755

8,580

300

730

101

5/18/18

432

5/19/18

1,131

432

7,467

9,030

300

730

101

5/19/18

1,326

284

5/20/18

1,131

1,610

16,159

18,900

5/18/18

300

730

102

5/20/18

2,035

851

5/21/18

1,132

2,886

13,082

17,100

5/19/18

300

777

122

5/21/18

1,765

780

5/22/18

1,199

2,545

9,156

12,900

5/20/18

300

832

190

5/22/18

834

426

5/23/18

1,322

1,260

12,918

15,500

5/21/18

393

834

190

5/23/18

834

426

5/24/18

1,417

1,260

11,623

14,300

5/22/18

391

834

190

5/24/18

833

426

5/25/18

1,415

1,259

8,426

11,100

5/23/18

300

834

124

5/25/18

833

426

5/26/18

1,258

1,259

6,773

9,290

5/24/18

300

834

121

5/26/18

838

426

5/27/18

1,255

1,264

5,621

8,140

5/25/18

299

764

121

5/27/18

834

426

5/28/18

1,184

1,260

5,006

7,450

5/26/18

209

674

116

5/28/18

591

319

5/29/18

999

910

4,271

6,180

5/27/18

156

523

101

5/29/18

274

284

5/30/18

780

558

4,072

5,410

5/28/18

139

449

101

5/30/18

353

230

5/31/18

689

583

3,548

4,820

Tables 1, 3–10, 13 39

5/16/18 5/17/18

Controlled releases from New York City Reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Date

Controlled releases

Amount Col. 1

Pepacton

Cannonsville

Neversink

Col. 2

Col. 3

Col. 4

Date

Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Date

New York City reservoirs Directed

Other

Col. 7

Col. 8

Powerplants

Computed uncontrolled

Total

Col. 9

Col. 10

Col. 11

IERQ bank releases

Col. 12

5/29/18

139

449

101

5/31/18

353

195

6/1/18

689

548

3,253

4,490

5/30/18

139

438

108

6/1/18

331

213

6/2/18

685

544

3,691

4,920

5/31/18

139

461

110

6/2/18

195

6/3/18

710

249

4,471

5,430

6/1/18

138

461

110

6/3/18

205

177

6/4/18

709

382

3,499

4,590

6/2/18

139

458

110

6/4/18

352

160

6/5/18

707

512

3,301

4,520

6/3/18

139

458

110

6/5/18

425

160

6/6/18

707

585

3,038

4,330

6/4/18

139

459

110

6/6/18

506

177

6/7/18

708

683

2,689

4,080

6/5/18

139

459

110

6/7/18

508

106

6/8/18

708

614

2,358

3,680

6/6/18

139

459

110

6/8/18

409

6/9/18

708

427

2,005

3,140

6/7/18

139

459

110

6/9/18

124

6/10/18

708

124

1,938

2,770

6/8/18

139

461

110

6/10/18

6/11/18

710

1,900

2,610

6/9/18

139

464

110

6/11/18

261

6/12/18

713

270

1,737

2,720

6/10/18

139

449

110

6/12/18

246

6/13/18

698

317

1,635

2,650

6/11/18

139

458

110

6/13/18

234

6/14/18

707

252

1,651

2,610

6/12/18

139

461

110

6/14/18

261

6/15/18

710

314

1,436

2,460

6/13/18

139

461

108

6/15/18

231

6/16/18

708

266

1,466

2,440

6/14/18

227

139

433

101

6/16/18

100

6/17/18

227

446

118

1,259

2,050

6/15/18

135

415

6/17/18

316

6/18/18

649

334

1,317

2,300

6/16/18

145

133

518

101

6/18/18

387

6/19/18

145

607

422

1,296

2,470

191 (Th)

6/17/18

135

548

101

6/19/18

288

6/20/18

784

288

1,338

2,410

52 (Th)

6/18/18

135

412

101

6/20/18

220

6/21/18

559

220

1,282

2,150

6/19/18

290

135

412

101

6/21/18

213

6/22/18

290

358

248

1,154

2,050

6/20/18

259

136

412

101

6/22/18

148

6/23/18

259

390

219

1,132

2,000

6/21/18

338

135

412

101

6/23/18

6/24/18

338

310

1,157

1,850

6/22/18

275

135

410

101

6/24/18

6/25/18

275

371

1,436

2,100

6/23/18

208

135

410

101

6/25/18

6/26/18

208

438

113

1,651

2,410

40 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record. All provided measurements are the mean discharge in cubic feet per second (ft3/s) for 24 hours. Column (col.) 1 = Office of the Delaware River Master directed release. Col. 2 = 24 hours beginning 1200 of date shown. Col. 3 = 24 hours ending 2400, 1 day later. Col. 4 = 24 hours beginning 1500, 1 day later. Col 5 = 24 hours beginning 0000 of date shown. Col. 6 = 24 hours beginning 1600 of the date shown. Col. 7 = col. 2 + col. 3 + col. 4 in response to direction (col. 1). Col. 8 = col. 2 + col. 3 + col. 4 – col. 7. Col. 9 = col. 5 + col. 6. Col. 10 = col. 11 – col. 7 – col. 8 – col. 9. Col. 11 = 24 hours of calendar day shown. Col. 12 = Interim Excess Release Quantity (IERQ) bank releases. Th, thermal IERQ bank; —, not applicable] Controlled releases from powerplant reservoirs

Controlled releases from New York City Reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Date

Controlled releases

Amount Col. 1

Pepacton

Cannonsville

Neversink

Col. 2

Col. 3

Col. 4

Date

Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Date

New York City reservoirs

Powerplants

Computed uncontrolled

Total

IERQ bank releases

Directed

Other

Col. 7

Col. 8

Col. 9

Col. 10

Col. 11

Col. 12 0

6/24/18

190

135

410

101

6/26/18

104

6/27/18

190

456

139

1,505

2,290

6/25/18

184

135

410

101

6/27/18

110

6/28/18

184

462

163

1,661

2,470

6/26/18

135

410

101

6/28/18

6/29/18

646

125

2,889

3,660

6/27/18

135

408

101

6/29/18

438

142

6/30/18

644

580

2,816

4,040

6/28/18

135

408

101

6/30/18

453

167

7/1/18

644

620

2,026

3,290

6/29/18

135

535

101

7/1/18

532

213

7/2/18

771

745

1,534

3,050

121 (Th) 323 (Th)

6/30/18

135

718

121

7/2/18

545

301

7/3/18

974

846

1,240

3,060

7/1/18

156

668

121

7/3/18

550

365

7/4/18

945

915

960

2,820

296 (Th)

7/2/18

159

616

121

7/4/18

486

122

7/5/18

896

608

1,236

2,740

248 (Th)

159

551

121

7/5/18

273

179

7/6/18

831

452

1,077

2,360

181 (Th)

159

415

102

7/6/18

386

106

7/7/18

676

492

1,082

2,250

26 (Th)

7/5/18

138

415

101

7/7/18

206

187

7/8/18

654

393

1,153

2,200

3 (Th)

7/6/18

355

133

415

101

7/8/18

133

189

7/9/18

355

294

322

899

1,870

7/7/18

465

133

415

101

7/9/18

191

7/10/18

465

184

224

957

1,830

7/8/18

420

133

413

101

7/10/18

184

7/11/18

420

227

238

985

1,870

7/9/18

447

135

413

101

7/11/18

188

165

7/12/18

447

202

353

868

1,870

7/10/18

491

135

413

101

7/12/18

172

268

7/13/18

491

158

440

831

1,920

7/11/18

185

135

412

101

7/13/18

411

334

7/14/18

185

463

745

787

2,180

7/12/18

224

135

412

101

7/14/18

308

309

7/15/18

224

424

617

875

2,140

7/13/18

135

412

101

7/15/18

455

338

7/16/18

648

793

719

2,160

7/14/18

135

472

101

7/16/18

384

358

7/17/18

708

742

770

2,220

57 (Th)

7/15/18

135

565

7/17/18

284

358

7/18/18

799

642

899

2,340

150 (Th)

7/16/18

133

381

7/18/18

228

305

7/19/18

608

533

739

1,880

7/17/18

335

125

362

7/19/18

249

206

7/20/18

335

246

455

594

1,630

7/18/18

264

125

362

7/20/18

370

255

7/21/18

264

317

625

514

1,720

7/19/18

537

125

362

7/21/18

219

7/22/18

537

265

624

1,470

Tables 1, 3–10, 13 41

7/3/18 7/4/18

Controlled releases from New York City Reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Date

Controlled releases

Amount Col. 1

Pepacton

Cannonsville

Neversink

Col. 2

Col. 3

Col. 4

Date

Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Date

New York City reservoirs Directed

Other

Col. 7

Col. 8

Powerplants

Computed uncontrolled

Total

Col. 9

Col. 10

Col. 11

IERQ bank releases

Col. 12

7/20/18

125

362

7/22/18

189

7/23/18

581

256

1,633

2,470

7/21/18

125

360

7/23/18

205

209

7/24/18

579

414

4,507

5,500

7/22/18

125

360

7/24/18

1,021

550

7/25/18

509

1,571

8,650

10,800

7/23/18

125

360

7/25/18

1,598

411

7/26/18

579

2,009

14,312

16,900

7/24/18

125

360

7/26/18

1,603

493

7/27/18

579

2,096

13,625

16,300

7/25/18

111

362

139

7/27/18

795

454

7/28/18

612

1,249

7,539

9,400

7/26/18

125

430

190

7/28/18

605

206

7/29/18

745

811

5,234

6,790

7/27/18

153

526

190

7/29/18

737

106

7/30/18

869

843

3,678

5,390

7/28/18

167

549

190

7/30/18

666

283

7/31/18

906

949

2,705

4,560

7/29/18

170

549

189

7/31/18

650

840

8/1/18

908

1,490

2,172

4,570

7/30/18

170

549

190

8/1/18

840

213

8/2/18

909

1,053

5,278

7,240

7/31/18

170

549

190

8/2/18

839

246

8/3/18

909

1,085

6,066

8,060

8/1/18

170

549

190

8/3/18

803

197

8/4/18

909

1,000

19,191

21,100

8/2/18

170

549

190

8/4/18

838

262

8/5/18

909

1,100

17,891

19,900

8/3/18

196

551

190

8/5/18

843

298

8/6/18

937

1,141

10,322

12,400

8/4/18

692

554

190

8/6/18

840

440

8/7/18

1,436

1,280

6,994

9,710

8/5/18

699

664

190

8/7/18

835

394

8/8/18

1,553

1,229

6,308

9,090

8/6/18

696

931

190

8/8/18

688

365

8/9/18

1,817

1,053

11,030

13,900

8/7/18

701

1,032

190

8/9/18

380

362

8/10/18

1,923

742

12,435

15,100

8/8/18

699

1,327

190

8/10/18

472

255

8/11/18

2,216

727

7,957

10,900

8/9/18

699

1,494

190

8/11/18

522

130

8/12/18

2,383

652

9,365

12,400

8/10/18

699

1,501

190

8/12/18

424

281

8/13/18

2,390

705

8,405

11,500

8/11/18

699

1,502

190

8/13/18

607

323

8/14/18

2,391

930

9,979

13,300

8/12/18

699

1,504

190

8/14/18

841

372

8/15/18

2,393

1,213

16,194

19,800

8/13/18

640

1,505

190

8/15/18

840

401

8/16/18

2,335

1,241

13,824

17,400

8/14/18

1,507

189

8/16/18

835

400

8/17/18

1,783

1,235

10,282

13,300

42 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record. All provided measurements are the mean discharge in cubic feet per second (ft3/s) for 24 hours. Column (col.) 1 = Office of the Delaware River Master directed release. Col. 2 = 24 hours beginning 1200 of date shown. Col. 3 = 24 hours ending 2400, 1 day later. Col. 4 = 24 hours beginning 1500, 1 day later. Col 5 = 24 hours beginning 0000 of date shown. Col. 6 = 24 hours beginning 1600 of the date shown. Col. 7 = col. 2 + col. 3 + col. 4 in response to direction (col. 1). Col. 8 = col. 2 + col. 3 + col. 4 – col. 7. Col. 9 = col. 5 + col. 6. Col. 10 = col. 11 – col. 7 – col. 8 – col. 9. Col. 11 = 24 hours of calendar day shown. Col. 12 = Interim Excess Release Quantity (IERQ) bank releases. Th, thermal IERQ bank; —, not applicable] Controlled releases from New York City Reservoirs

Controlled releases from powerplant reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Date

Controlled releases

Amount Col. 1

Pepacton

Cannonsville

Neversink

Col. 2

Col. 3

Col. 4

Date

Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Date

New York City reservoirs

Powerplants

Computed uncontrolled

Total

IERQ bank releases

Directed

Other

Col. 7

Col. 8

Col. 9

Col. 10

Col. 11

Col. 12

8/15/18

1,508

189

8/17/18

840

489

8/18/18

1,793

1,329

12,878

16,000

8/16/18

599

1,508

150

8/18/18

836

437

8/19/18

2,257

1,273

18,170

21,700

8/17/18

378

1,507

190

8/19/18

839

432

8/20/18

2,075

1,271

15,154

18,500

8/18/18

1,504

189

8/20/18

834

222

8/21/18

1,753

1,056

11,491

14,300

8/19/18

1,493

190

8/21/18

839

8/22/18

1,742

928

9,730

12,400

8/20/18

1,494

190

8/22/18

840

8/23/18

1,783

893

9,124

11,800

8/21/18

667

1,494

190

8/23/18

702

8/24/18

2,351

755

6,404

9,510

8/22/18

699

1,494

190

8/24/18

732

8/25/18

2,383

785

4,662

7,830

8/23/18

699

1,491

190

8/25/18

637

8/26/18

2,380

691

3,599

6,670

8/24/18

699

1,504

190

8/26/18

634

8/27/18

2,393

720

3,087

6,200

8/25/18

699

1,502

190

8/27/18

770

261

8/28/18

2,391

1,031

2,818

6,240

8/26/18

699

1,501

189

8/28/18

866

387

8/29/18

2,389

1,253

2,528

6,170

8/27/18

699

1,497

190

8/29/18

1,066

373

8/30/18

2,386

1,439

2,105

5,930

8/28/18

699

1,494

190

8/30/18

867

236

8/31/18

2,383

1,103

1,894

5,380

8/29/18

699

1,482

192

8/31/18

591

236

9/1/18

2,373

827

1,820

5,020

8/30/18

699

1,453

192

9/1/18

616

177

9/2/18

2,344

793

2,303

5,440

8/31/18

699

1,375

190

9/2/18

834

9/3/18

2,264

887

1,859

5,010

9/1/18

699

1,290

190

9/3/18

746

241

9/4/18

2,179

987

1,684

4,850

9/2/18

645

1,194

190

9/4/18

742

256

9/5/18

2,029

998

1,423

4,450

583

1,145

190

9/5/18

705

205

9/6/18

1,918

910

1,632

4,460

575

1,157

190

9/6/18

618

127

9/7/18

1,922

745

1,603

4,270

9/5/18

577

1,148

190

9/7/18

313

9/8/18

1,915

353

2,212

4,480

9/6/18

580

1,143

190

9/8/18

431

9/9/18

1,913

470

1,787

4,170

9/7/18

574

1,140

190

9/9/18

372

9/10/18

1,904

411

2,555

4,870

9/8/18

575

1,140

190

9/10/18

863

9/11/18

1,905

941

14,054

16,900

9/9/18

574

1,137

190

9/11/18

1,406

161

9/12/18

1,901

1,567

10,232

13,700

Tables 1, 3–10, 13 43

9/3/18 9/4/18

Controlled releases from powerplant reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Controlled releases Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Pepacton

Cannonsville

Neversink

Col. 1

Col. 2

Col. 3

Col. 4

9/10/18

575

1,151

190

9/12/18

1,456

145

9/11/18

575

1,148

190

9/13/18

1,208

252

9/12/18

574

1,140

190

9/14/18

1,441

235

Date

Amount

Date

New York City reservoirs

Powerplants

Computed uncontrolled

Total

IERQ bank releases

Directed

Other

Col. 7

Col. 8

Col. 9

Col. 10

Col. 11

Col. 12

9/13/18

1,916

1,601

7,283

10,800

9/14/18

1,913

1,460

7,127

10,500

9/15/18

1,904

1,676

6,410

9,990

9/13/18

577

1,247

190

9/15/18

1,444

124

9/16/18

2,014

1,568

5,318

8,900

9/14/18

684

1,494

190

9/16/18

1,450

284

9/17/18

2,368

1,734

4,388

8,490

9/15/18

698

1,497

190

9/17/18

1,451

381

9/18/18

2,385

1,832

6,183

10,400

9/16/18

699

1,499

190

9/18/18

1,452

319

9/19/18

2,388

1,771

10,741

14,900

9/17/18

699

1,437

192

9/19/18

845

230

9/20/18

2,328

1,075

8,497

11,900

9/18/18

699

1,222

190

9/20/18

1,458

9/21/18

2,111

1,530

6,199

9,840

9/19/18

699

1,001

190

9/21/18

1,341

147

9/22/18

1,890

1,488

4,762

8,140

9/20/18

699

804

190

9/22/18

606

9/23/18

1,693

659

7,168

9,520

9/21/18

699

693

190

9/23/18

605

9/24/18

1,582

659

5,659

7,900

9/22/18

701

693

192

9/24/18

1,000

9/25/18

1,586

1,054

7,340

9,980

9/23/18

701

750

190

9/25/18

1,486

9/26/18

1,641

1,542

22,617

25,800

9/24/18

699

1,239

192

9/26/18

1,386

370

9/27/18

2,130

1,756

20,414

24,300

9/25/18

699

1,491

190

9/27/18

1,016

186

9/28/18

2,380

1,202

20,318

23,900

9/26/18

701

1,493

190

9/28/18

979

369

9/29/18

2,384

1,348

21,068

24,800

9/27/18

699

1,494

190

9/29/18

1,447

334

9/30/18

2,383

1,781

13,936

18,100

9/28/18

699

1,496

190

9/30/18

1,448

364

10/1/18

2,385

1,812

10,503

14,700

9/29/18

699

1,501

190

10/1/18

1,313

504

10/2/18

2,390

1,817

7,793

12,000

9/30/18

699

1,502

190

10/2/18

348

514

10/3/18

2,391

862

18,047

21,300

10/1/18

699

1,502

190

10/3/18

1,029

828

10/4/18

2,391

1,857

13,952

18,200

10/2/18

699

1,502

190

10/4/18

1,503

814

10/5/18

2,391

2,317

11,492

16,200

10/3/18

699

1,505

190

10/5/18

1,495

555

10/6/18

2,394

2,050

9,056

13,500

10/4/18

701

1,502

190

10/6/18

1,173

525

10/7/18

2,393

1,698

7,609

11,700

10/5/18

699

1,502

190

10/7/18

544

446

10/8/18

2,391

990

6,389

9,770

44 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record. All provided measurements are the mean discharge in cubic feet per second (ft3/s) for 24 hours. Column (col.) 1 = Office of the Delaware River Master directed release. Col. 2 = 24 hours beginning 1200 of date shown. Col. 3 = 24 hours ending 2400, 1 day later. Col. 4 = 24 hours beginning 1500, 1 day later. Col 5 = 24 hours beginning 0000 of date shown. Col. 6 = 24 hours beginning 1600 of the date shown. Col. 7 = col. 2 + col. 3 + col. 4 in response to direction (col. 1). Col. 8 = col. 2 + col. 3 + col. 4 – col. 7. Col. 9 = col. 5 + col. 6. Col. 10 = col. 11 – col. 7 – col. 8 – col. 9. Col. 11 = 24 hours of calendar day shown. Col. 12 = Interim Excess Release Quantity (IERQ) bank releases. Th, thermal IERQ bank; —, not applicable] Controlled releases from New York City Reservoirs

Controlled releases from powerplant reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Date

Controlled releases

Amount Col. 1

Pepacton

Cannonsville

Neversink

Col. 2

Col. 3

Col. 4

Date

Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Date

New York City reservoirs Directed

Other

Col. 7

Col. 8

Powerplants

Computed uncontrolled

Total

Col. 9

Col. 10

Col. 11

IERQ bank releases

Col. 12

10/6/18

699

1,497

190

10/8/18

555

10/9/18

2,386

555

5,969

8,910

10/7/18

699

1,499

190

10/9/18

471

10/10/18

2,388

471

5,291

8,150

10/8/18

699

1,497

190

10/10/18

530

10/11/18

2,386

530

6,614

9,530

10/9/18

699

1,497

190

10/11/18

817

10/12/18

2,386

817

17,497

20,700

10/10/18

699

1,499

190

10/12/18

826

10/13/18

2,388

826

12,486

15,700

10/11/18

699

1,499

190

10/13/18

830

10/14/18

2,388

830

10,082

13,300

10/12/18

699

1,496

190

10/14/18

830

10/15/18

2,385

830

8,185

11,400

10/13/18

699

1,497

190

10/15/18

826

10/16/18

2,386

826

7,588

10,800

10/14/18

699

1,494

190

10/16/18

879

10/17/18

2,383

879

6,838

10,100

10/15/18

699

1,502

190

10/17/18

874

10/18/18

2,391

874

5,835

9,100

10/16/18

698

1,508

190

10/18/18

604

10/19/18

2,396

608

5,046

8,050

10/17/18

698

1,508

190

10/19/18

462

10/20/18

2,396

466

4,538

7,400

10/18/18

698

1,502

190

10/20/18

356

10/21/18

2,390

356

4,374

7,120

10/19/18

698

1,497

192

10/21/18

425

10/22/18

2,387

425

4,248

7,060

10/20/18

699

1,497

190

10/22/18

500

10/23/18

2,386

500

3,664

6,550

10/21/18

701

1,497

190

10/23/18

379

10/24/18

2,388

379

3,473

6,240

10/22/18

699

1,496

190

10/24/18

449

10/25/18

2,385

449

3,356

6,190

10/23/18

699

1,496

190

10/25/18

390

10/26/18

2,385

390

3,095

5,870

10/24/18

699

1,493

190

10/26/18

474

10/27/18

2,382

494

3,374

6,250

699

1,491

190

10/27/18

498

10/28/18

2,380

498

8,022

10,900

699

1,491

190

10/28/18

494

10/29/18

2,380

498

8,522

11,400

10/27/18

699

1,497

190

10/29/18

605

489

10/30/18

2,386

1,094

8,120

11,600

10/28/18

699

1,501

190

10/30/18

754

802

10/31/18

2,390

1,556

6,754

10,700

10/29/18

699

1,499

190

10/31/18

756

479

11/1/18

2,388

1,235

5,857

9,480

10/30/18

699

1,501

190

11/1/18

745

631

11/2/18

2,390

1,376

6,194

9,960

10/31/18

699

1,499

190

11/2/18

769

674

11/3/18

2,388

1,443

18,469

22,300

Tables 1, 3–10, 13 45

10/25/18 10/26/18

Controlled releases from powerplant reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Controlled releases Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Pepacton

Cannonsville

Neversink

Col. 1

Col. 2

Col. 3

Col. 4

11/1/18

699

1,497

190

11/3/18

776

907

11/2/18

701

1,501

198

11/4/18

751

881

11/3/18

729

1,566

190

11/5/18

1,285

11/4/18

699

1,504

190

11/6/18

11/5/18

699

1,501

190

11/6/18

699

1,501

11/7/18

699

11/8/18

11/9/18

Date

Amount

Date

New York City reservoirs

Powerplants

Computed uncontrolled

Total

IERQ bank releases

Directed

Other

Col. 7

Col. 8

Col. 9

Col. 10

Col. 11

Col. 12

11/4/18

2,386

1,683

19,331

23,400

11/5/18

2,400

1,632

13,468

17,500

883

11/6/18

2,485

2,168

14,547

19,200

1,599

889

11/7/18

2,393

2,488

18,319

23,200

11/7/18

1,598

891

11/8/18

2,390

2,489

13,821

18,700

190

11/8/18

1,599

898

11/9/18

2,390

2,497

11,013

15,900

1,502

190

11/9/18

1,088

895

11/10/18

2,391

1,983

16,126

20,500

699

1,504

190

11/10/18

600

851

11/11/18

2,393

1,451

15,756

19,600

699

1,507

190

11/11/18

566

851

11/12/18

2,396

1,417

11,987

15,800

11/10/18

699

1,508

190

11/12/18

573

887

11/13/18

2,397

1,460

12,643

16,500

11/11/18

699

1,508

190

11/13/18

1,218

885

11/14/18

2,397

2,103

15,200

19,700

11/12/18

699

1,505

190

11/14/18

1,582

788

11/15/18

2,394

2,370

11,636

16,400

11/13/18

699

1,501

190

11/15/18

1,585

883

11/16/18

2,390

2,468

10,242

15,100

11/14/18

699

1,501

190

11/16/18

1,141

688

11/17/18

2,390

1,829

10,281

14,500

11/15/18

699

1,501

190

11/17/18

1,604

657

11/18/18

2,390

2,261

8,749

13,400

11/16/18

699

1,502

190

11/18/18

1,599

847

11/19/18

2,391

2,446

8,063

12,900

11/17/18

699

1,501

190

11/19/18

1,448

716

11/20/18

2,390

2,164

8,646

13,200

11/18/18

699

1,501

190

11/20/18

1,025

847

11/21/18

2,390

1,872

10,038

14,300

11/19/18

699

1,501

190

11/21/18

1,279

883

11/22/18

2,390

2,162

8,148

12,700

11/20/18

699

1,501

190

11/22/18

1,281

883

11/23/18

2,390

2,164

6,446

11,000

11/21/18

701

1,499

190

11/23/18

1,269

882

11/24/18

2,390

2,151

5,759

10,300

11/22/18

701

1,497

190

11/24/18

1,269

880

11/25/18

2,388

2,149

11,763

16,300

11/23/18

701

1,496

190

11/25/18

1,420

851

11/26/18

2,387

2,271

15,742

20,400

11/24/18

699

1,496

190

11/26/18

1,582

888

11/27/18

2,385

2,470

26,845

31,700

11/25/18

699

1,497

190

11/27/18

1,580

887

11/28/18

2,386

2,467

24,047

28,900

11/26/18

699

1,501

190

11/28/18

1,580

961

11/29/18

2,390

2,541

16,969

21,900

11/27/18

699

1,502

190

11/29/18

1,587

887

11/30/18

2,391

2,474

13,335

18,200

46 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued

Table 10. Controlled releases from reservoirs in the upper Delaware River Basin and segregation of flow of Delaware River at Montague, New Jersey, for the year ending November 30, 2018.—Continued [Delaware River Master daily operations record. All provided measurements are the mean discharge in cubic feet per second (ft3/s) for 24 hours. Column (col.) 1 = Office of the Delaware River Master directed release. Col. 2 = 24 hours beginning 1200 of date shown. Col. 3 = 24 hours ending 2400, 1 day later. Col. 4 = 24 hours beginning 1500, 1 day later. Col 5 = 24 hours beginning 0000 of date shown. Col. 6 = 24 hours beginning 1600 of the date shown. Col. 7 = col. 2 + col. 3 + col. 4 in response to direction (col. 1). Col. 8 = col. 2 + col. 3 + col. 4 – col. 7. Col. 9 = col. 5 + col. 6. Col. 10 = col. 11 – col. 7 – col. 8 – col. 9. Col. 11 = 24 hours of calendar day shown. Col. 12 = Interim Excess Release Quantity (IERQ) bank releases. Th, thermal IERQ bank; —, not applicable] Controlled releases from New York City Reservoirs

Controlled releases from powerplant reservoirs

Segregation of flow, Delaware River at Montague, New Jersey

Directed

Controlled releases Lake Wallenpaupack

Rio Reservoir

Col. 5

Col. 6

Pepacton

Cannonsville

Neversink

Col. 1

Col. 2

Col. 3

Col. 4

Dec. 2017

5,326

2,373

5,616

1,820

—

4,582

Jan. 2018

862

2,416

4,815

2,044

—

8,229

10,893

Feb. 2018

3,762

7,570

3,576

—

28,437

Mar. 2018

14,252

28,186

4,068

—

20,030

Apr. 2018

9,660

37,089

3,024

—

May2018

11,862

32,294

3,917

Jun. 2018

2,205

4,116

13,335

3,159

Date

Amount

Date

New York City reservoirs

IERQ bank releases

Powerplants

Computed uncontrolled

Total

Col. 9

Col. 10

Col. 11

Col. 12

Directed

Other

Col. 7

Col. 8

—

5,323

4,486

4,660

54,151

68,620

—

1,092

8,183

19,122

170,393

198,790

14,081

—

14,908

42,518

238,494

295,920

12,536

—

46,506

32,566

182,478

261,550

12,744

12,609

—

49,773

25,353

258,084

333,210

—

19,546

7,376

—

48,073

26,922

208,265

283,260

—

6,859

2,260

—

2,205

18,405

9,119

61,961

91,690

243

Monthly and annual totals

Jul. 2018

3,793

4,209

13,804

3,452

—

14,626

7,637

—

3,793

17,672

22,263

83,252

126,980

1,405

Aug. 2018

14,907

37,808

5,845

—

23,399

9,004

—

58,560

32,403

277,337

368,300

Sept. 2018

19,556

36,297

5,710

—

30,308

5,317

—

61,563

35,625

228,592

325,780

Oct. 2018

21,669

46,463

5,892

—

10,244

18,310

—

74,024

28,554

237,812

340,390

Nov. 2018

21,008

45,100

5,708

—

36,754

24,930

—

71,816

61,684

389,440

522,940

12,186

129,790

308,377

48,215

—

211,254

129,535

—

12,413

473,969

340,789

2,390,259

3,217,430

1,648

Total

Tables 1, 3–10, 13 47

48 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 Table 13. Daily mean discharge of the Delaware River at Montague, New Jersey (U.S. Geological Survey site number 01438500), for report year ending November 30, 2018. [Data from U.S. Geological Survey (2019d). All values, except for the year’s total discharge volume, are in cubic feet per second (ft3/s). The total discharge volume is given in cubic feet per second accumulated daily ([ft3/s]-d). e, estimated; —, not applicable]

Day

Dec.

Jan.

Feb.

Mar.

Apr.

May

June

July

Aug.

Sept.

Oct.

Nov.

1,950

2,540e

4,870

15,100

11,700

9,770

4,490

3,060

5,020

14,700

9,480

1,940

2,740e

4,560e

17,300

10,800

9,690

4,920

3,050

7,240

5,440

12,000

9,960

1,930

2,850e

3,920e

18,200

10,900

9,120

5,430

3,040

8,060

5,010

21,300

22,300

1,850

2,910e

3,090e

14,900

14,000

8,630

4,590

2,790

21,100

4,820

18,200

23,400

1,800

3,140e

3,330

13,000

15,900

7,310

4,520

2,690

19,900

4,450

16,200

17,500

1,830

3,500e

3,890

11,600

14,300

6,820

4,330

2,300

12,400

4,460

13,500

19,200

2,010

3,660e

3,730

11,300

12,200

7,450

4,080

2,170

9,710

4,270

11,700

23,200

2,130

3,530e

3,950

11,300

11,000

7,620

3,680

2,110

9,090

4,480

9,770

18,700

2,010

3,390e

4,570e

10,100

10,200

6,660

3,140

1,760

13,900

4,170

8,910

15,900

1,960

3,230e

4,430

8,260

9,430

6,600

2,770

1,710

15,100

4,870

8,150

20,500

1,860

3,050

3,710

7,560

8,540

6,430

2,610

1,730

10,900

16,900

9,530

19,600

1,820

3,800

6,040

8,070

7,190

6,110

2,720

1,720

12,400

13,700

20,700

15,800

1,730e

13,000

7,770

8,280

6,730

6,360

2,650

1,760

11,500

10,800

15,700

16,500

1,630e

16,500

7,530

7,300

6,460

6,970

2,610

2,000

13,300

10,500

13,300

19,700

1,570e

9,980

7,610

6,570

6,670

8,210

2,550

1,950

19,800

9,990

11,400

16,400

1,560e

7,280

10,500

6,290

9,130

10,400

2,530

2,160

17,400

8,900

10,800

15,100

2,080

6,390e

14,700

5,490

18,600

10,400

2,030

2,220

13,300

8,490

10,100

14,500

2,170

6,130e

12,300

4,550

18,200

8,580

2,260

2,340

16,000

10,400

9,100

13,400

2,220

5,620e

10,400

4,880

15,400

9,030

2,420

1,880

21,700

14,900

8,050

12,900

2,310

4,950

11,900

5,230

13,000

18,900

2,340

1,630

18,500

11,900

7,400

13,200

2,100

4,130

17,100

4,690

10,900

17,100

2,070

1,720

14,300

9,840

7,120

14,300

1,990

4,110

18,500

4,540

10,200

12,900

1,970

1,470

12,400

8,140

7,060

12,700

1,980

6,220

17,700

4,640

9,430

15,500

1,900

2,470

11,800

9,520

6,550

11,000

3,120

21,000

16,600

4,110

8,780

14,300

1,740

5,540

9,510

7,900

6,240

10,300

4,190

14,500

23,500

3,850

8,950

11,100

1,980

10,900

7,830

9,980

6,190

16,300

3,390e

10,200

29,800

4,470

11,100

9,290

2,260

16,900

6,670

25,800

5,870

20,400

2,820e

7,930

21,700

5,080

11,000

8,140

2,130

16,400

6,200

24,300

6,250

31,700

2,360e

6,790

17,400

5,230

11,300

7,450

2,300

9,760

6,240

23,900

10,900

28,900

2,260e

6,320

—

7,090

11,000

6,180

3,450

7,210

6,170

24,800

11,400

21,900

2,260e

5,930e

—

8,770

10,200

5,410

3,820

5,830

5,930

18,100

11,600

18,200

2,370e

5,550e

—

13,800

—

4,820

—

5,010

5,380

—

10,700

—

Total1

67,200

200,870

295,100

261,550

333,210

283,250

90,290

127,280

368,750

325,750

340,390

522,940

Mean2

2,168

6,480

10,539

8,437

11,107

9,137

3,010

4,106

11,895

10,858

10,980

17,431

1The year’s total is 3,216,580 cubic feet per second accumulated daily. 2The combined mean is 8,813cubic feet per second.

References Cited 49

References Cited Delaware River Basin Commission, 2013, Delaware River Basin Water Code, with amendments through December 4, 2013: Delaware River Basin Commission 18CFR part 410, 175 p., accessed February 18, 2020, at https://www.nj.gov/drbc/library/documents/watercode.pdf. Nystrom, E.A., 2018, Bathymetry of Ashokan, Cannonsville, Neversink, Pepacton, Rondout, and Schoharie Reservoirs, New York, 2013–15 (ver. 1.2, November 2018): U.S. Geological Survey Scientific Investigations Report 2017–5064, 29, p., accessed January 23, 2019, at https://doi.org/10.3133/sir20175064. Parties of the 1954 U.S. Supreme Court Decree, 2017, Appendix A—Flexible Flow Management Program in FFMP 2017 operations plan, New Jersey v. New York, 347 U.S. 995: U.S. Geological Survey website, 24 p., accessed August 16, 2024, at https://webapps.usgs.gov/ odrm/documents/ffmp/Appendix_A_FFMP-20180716- Final.pdf. [Decree parties are the States of Delaware, New Jersey, New York, and Pennsylvania, and New York City.] Parties of the 1954 U.S. Supreme Court Decree, 2018, Modification and reissuance of appendix A to the 2017 Agreement for a Flexible Flow Management Program, New Jersey v. New York, 347 U.S. 995: U.S. Geological Survey website, 2 p., accessed August 16, 2024, at https://webapps.usgs.gov/odrm/documents/ffmp/Signed- AppA-Mod-20180716.pdf. [Decree parties are the States of Delaware, New Jersey, New York, and Pennsylvania, and New York City.] Russell, K.L., Andrews, W.J., DiFrenna, V.J., Norris, J.M., and Mason, R.R., Jr., 2024, Report of the River Master of the Delaware River for the period December 1, 2016– November 30, 2017: U.S. Geological Survey Open-File Report, 2024–1022, 109 p., accessed August 16, 2024, at https://doi.org/10.3133/ofr20241022.

U.S. Geological Survey [USGS], 2019a, USGS 01417000 East Branch Delaware River at Downsville NY: USGS National Water Information System database, accessed January 23, 2019, at https://waterdata.usgs.gov/nwis/ dv?cb_00060=on&format=html&site_no= 01417000&referred_module=sw&period=&begin_date= 2016-12-01&end_date=2017-11-30. U.S. Geological Survey [USGS], 2019b, USGS 01425000 West Branch Delaware River at Stilesville NY: USGS National Water Information System database, accessed January 23, 2019, at https://nwis.waterdata.usgs.gov/ nwis/dv?cb_00060=on&format=html&site_no= 01425000&referred_module=sw&period=&begin_date= 2016-12-01&end_date=2017-11-30. U.S. Geological Survey [USGS], 2019c, USGS 01436000 Neversink River at Neversink NY: USGS National Water Information System database, accessed January 23, 2019, at https://nwis.waterdata.usgs.gov/nwis/dv?cb_00060= on&format=html&site_no=01436000&referred_module= sw&period=&begin_date=2016-12-01&end_date= 2017-11-30. U.S. Geological Survey [USGS], 2019d, USGS 01438500 Delaware River at Montague NJ: USGS National Water Information System database, accessed January 23, 2019, at https://nwis.waterdata.usgs.gov/nwis/dv?cb_00060= on&format=html&site_no=01438500&referred_module= sw&period=&begin_date=2016-12-01&end_date= 2017-11-30. U.S. Geological Survey [USGS], 2019e, USGS 01460440 Delaware and Raritan Canal at Port Mercer NJ: USGS National Water Information System database, accessed January 23, 2019, at https://nwis.waterdata.usgs.gov/ nwis/dv?cb_00060=on&format=%20html&site_no= 01460440&referred_%20module=sw&period=&begin_date= 2016-12-01&end_%20date=2017-11-30.

50 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Glossary The following definitions apply to various terms and procedures used in the operations documented in this report.

L3—Conservation releases when New York City combined reservoir storage is in the drought watch (L3) storage zone.

balancing adjustment An operating procedure used by the Office of the Delaware River Master to correct for inaccuracies inherent in the design of releases from New York City reservoirs to meet the flow objective at Montague, New Jersey. The balancing adjustment calls for more water to be released when previous directed releases (or lack of releases) were insufficient to meet the Montague flow objective. The balancing adjustment calls for less water to be released when previous directed releases were higher than required to meet the Montague flow objective. The balancing adjustment, based on provisional data, is computed as 10 percent of the difference between the cumulative forecasted directed release and the actual directed release required. The balancing adjustment is applied to the following day’s release design. The maximum daily balancing adjustment is intentionally limited to preclude unacceptably large variations in the adjusted flow objective. Beginning July 15, 2018, the cumulative values and the adjustment are computed only when directed releases are greater than New York City reservoir conservation releases.

L4—Conservation releases when New York City combined reservoir storage is in the drought warning (L4) storage zone.

capacity Total useable volume in a reservoir between the point of maximum depletion and the elevation of the lower crest of the spillway. conservation releases Controlled releases from the Pepacton, Cannonsville, and Neversink Reservoirs designed to maintain specified minimum flows in stream channels immediately below the reservoirs (tailwaters). The following conservation rate zones are defined in the 2017 Flexible Flow Management Program as follows: L1—Spill mitigation when New York City combined reservoir storage is in the spill mitigation (L1) storage zone. L2—Conservation releases when New York City combined reservoir storage is in the normal (L2) storage zone.

L5—Conservation releases when New York City combined reservoir storage is in the drought (L5) storage zone (also referred to as “Drought Emergency”). contents Refer to “Storage.” controlled releases Controlled releases from reservoirs passed through outlet valves in the dams or turbines in powerplants. These releases do not include spillway overflow at the reservoirs. directed releases Controlled releases from New York City reservoirs in the upper Delaware River Basin, designed by the Office of the Delaware River Master to meet the Montague flow objective. diversions The out-of-basin transfer of water by New York City from the Pepacton, Cannonsville, and Neversink Reservoirs of New York State in the upper Delaware River Basin through the East Delaware, West Delaware, and Neversink Tunnels, respectively, to the New York City water-supply system. Also, the out-of-basin transfer of water by New Jersey from the Delaware River through the Delaware and Raritan Canal. Excess Release Quantity As defined by the Decree, the excess release quantity of water is “equal to 83 per cent [sic] of the amount by which the estimated consumption during such year is less than the City’s estimate of the continuous safe yield during such year of all its sources obtainable without pumping.” The excess release quantity shall not exceed 70 billion gallons, and the seasonal period for release of the excess quantity begins on June 15 and concludes on the following March 15.

Glossary 51 51 Flexible Flow Management Program (FFMP) A set of rules for the management of storage, diversions, releases, and flow targets relating to the apportioning of water from the Delaware River Basin under the 1954 U.S. Supreme Court Decree and unanimously agreed to by the Decree Parties (Delaware, New Jersey, New York, New York City, and Pennsylvania). Interim Excess Release Quantity An Interim Excess Release Quantity (IERQ) was defined in the 2017 Flexible Flow Management Program (Russell and others, 2024). The IERQ is computed as 83 percent of the difference between the highest year’s consumption of the New York City water-supply system during the period 2002–2006 (1,257 million gallons per day) and New York City’s current estimate of continuous safe yield of the New York City water-supply system of 1,290 million gallons per day, obtainable without pumping. The IERQ resets to 10.0 billion gallons (15,468 cubic feet per second accumulated daily) on June 1st of each year of the Agreement or upon return to normal conditions after drought. The IERQ shall be used as defined below: Trenton Equivalent Flow Objective: 6.09 billion gallons (9,423 cubic feet per second accumulated daily) of the IERQ, upon request by the Lower Basin States or the Delaware River Basin Commission, New York City shall release from the IERQ water in sufficient quantities to maintain a flow at Trenton of 3,000 cubic feet per second during basinwide normal conditions for the period commencing on June 1 and continuing through May 31. New York City shall make releases from the IERQ as provided above until the aggregate quantity of the IERQ is exhausted.

Thermal Mitigation: 1.62 billion gallons (2,500 cubic feet per second accumulated daily) of the IERQ will be banked and is available during basinwide normal conditions to support mitigation of thermal events that may adversely impact the cold-water fishery below the New York City Delaware River Basin Reservoirs. Use of the water for any single event will be informed by the current and forecasted basin conditions and the thermal mitigation guidance as developed by the Decree Parties. Releases for Thermal Mitigation shall be made at the direction of the New York State Department of Environmental Conservation and administered by the Office of the Delaware River Master (ODRM) and the New York City Department of Environmental Protection (NYCDEP) with notification made to all Decree Parties. Rapid Flow Change Mitigation: 0.65 billion gallons (1,000 cubic feet per second accumulated daily) of the IERQ will be banked and is available during basinwide normal conditions to mitigate potentially ecologically harmful conditions caused by rapid reductions in the New York City Delaware River Basin reservoir directed releases because of the requirements of the Montague flow objective in Section 2.a. Use of the water for any single event will be informed by the current basin conditions and the guidance for its use as developed by the Decree Parties. Releases to mitigate rapid flow changes shall be made at the direction of the ODRM and NYCDEP, with notification to all Decree Parties. NJ Diversion Amelioration: 1.65 billion gallons (2,545 cubic feet per second accumulated daily) of the IERQ will be banked and reserved for use during drought conditions (basinwide or lower basin), to supply New Jersey’s increased diversion when the New Jersey Diversion Offset Bank, as described below in Section 4.d., has been exhausted. Once the New York City reservoirs enter into drought watch, the combined storage of the city’s Delaware River Basin reservoirs shall be computed as the actual storage volume minus the New Jersey Diversion Amelioration Bank and New Jersey Diversion Offset Bank volumes for determining storage zones.

52 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018 Interim Excess Release Quantity Extraordinary Needs Bank: From section 3.d of the 2017 Flexible Flow Management Program (FFMP2017): “In addition to the hydrologic criteria described in Section 2.5.6.A. [sic] of the water code [Delaware River Basin Commission, 2013] and subject to other provisional uses of the Interim Excess Release Quantity (IERQ) as provided herein, the Decree Parties [Delaware, New Jersey, New York, New York City, and Pennsylvania], the DRBC and the River Master may at any time review extraordinary water needs to support such research, aquatic-life, or other water-use activity as may be approved by the DRBC. Upon unanimous agreement, the Decree Parties may bank all or a portion of the IERQ remaining at such time, and such portion shall be placed in an IERQ Extraordinary Needs Bank and used to provide for such extraordinary water needs. Such quantity as may be so banked shall be deducted from the agreed upon IERQ. Any unused Extraordinary Needs Bank water shall be returned to IERQ” (Parties of the 1954 U.S. Supreme Court Decree, 2017). key gaging stations Specific sites on the East Branch Delaware River, West Branch Delaware River, Neversink River, Delaware and Raritan Canal, and mainstem Delaware River where continuous, systematic observations of gage height and discharge are made. Data from these stations are used year-round in Office of the Delaware River Master operations.

Montague flow objective In section 2a of the 2017 Flexible Flow Management Program (FFMP2017), “Except with respect to limitations provided herein in Section 5, releases from the City Delaware Basin Reservoirs shall be in quantities designed to maintain, during Normal storage conditions, a minimum basic rate of flow at the gaging station of the U.S. Geological Survey * * * at Montague, N. J. of 1,750 cubic feet per second (cfs), as directed by the River Master in accordance with Section VII. [sic] of the Decree. During Basinwide Drought Watch, Drought Warning, and Drought Emergency, in accordance with Section 5 of this Agreement and Section 2.5.3.B. [sic] and Tables 1 and 2 of the Delaware River Basin Water Code * * *, the Montague flow objective shall vary based upon the time of year and location of the salt front, and minimum compensating releases shall be made by the City of New York from its reservoirs in the upper Delaware Basin” (Parties of the 1954 U.S. Supreme Court Decree, 2017). The Delaware River Basin Water Code can be found in Delaware River Basin Commission (2013). point of maximum depletion The minimum water-surface level or elevation below which a reservoir ceases to continue making delivery of quantities of water for all purposes for which the reservoir was designed. This elevation is referred to as the minimum full-operating level. storage Usable volume of water in a reservoir. Unless otherwise indicated, volume is computed based on the level of the pool above the point of maximum depletion. uncontrolled runoff Streamflow excluding controlled releases. In the context of this report, uncontrolled runoff excludes controlled releases from the Pepacton, Cannonsville, and Neversink Reservoirs; Lake Wallenpaupack; and Rio Reservoir, but include spillway overflow at these dams.

Appendix 1. Modification and Reissuance of Appendix A of the 2017 Agreement for a Flexible Flow Management Program 53

Appendix 1. Modification and Reissuance of Appendix A of the 2017 Agreement for a Flexible Flow Management Program An agreement affecting the Amended Decree of the U.S. Supreme Court in New Jersey v. New York, 347 U.S. 995 (1954), for managing diversions and releases under the Decree, was consented to by all of the Decree Parties: the State of Delaware, the State of New Jersey, the State of New York, the Commonwealth of Pennsylvania, and the City of New York. The agreement is a 10-year, two-part program that was signed and went into effect October 23, 2017 (Parties of the 1954 U.S. Supreme Court Decree, 2017). A modification and reissuance of “Appendix A” (Operations Plan) of the FFMP2017 on July 16, 2018, added clarification to the text, tables, and graphics, with operations fundamentally unchanged (Parties of the 1954 U.S. Supreme Court Decree, 2018). A copy of the modification agreement and the associated operations plan are included as appendix 1 here, respectively; the original page numbers were removed to avoid confusion. The documents are available through the U.S. Geological Survey website (https://webapps.usgs.gov/odrm/documents/ffmp/Signed-AppA-Mod-20180716.pdf and https://webapps.usgs.gov/odrm/documents/ffmp/Appendix_A_FFMP-20180716-Final.pdf).

54 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Appendix 1. Modification and Reissuance of Appendix A of the 2017 Agreement for a Flexible Flow Management Program 55

56 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

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58 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

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60 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

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62 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

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64 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

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66 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

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68 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

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70 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

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72 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

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74 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

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76 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

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78 Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

Appendix 1. Modification and Reissuance of Appendix A of the 2017 Agreement for a Flexible Flow Management Program 79

For more information about this report, contact: Delaware River Master, Office of the Delaware River Master, U.S. Geological Survey. Visit our website at: https://webapps.usgs.gov/odrm/ Publishing support provided by the Reston Publishing Service Center

Russell and others—Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018—OFR 2025–1051

ISSN 0196-1497 (print) ISSN 2331-1258 (online) https://doi.org/10.3133/ofr20241051

Report of the River Master of the Delaware River for the Period December 1, 2017–November 30, 2018

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