New York Codes, Rules and Regulations › Title 21 - Miscellaneous › Chapter XVIII - Delaware River Basin Commission › Subchapter E - Water Code › Part 890 - Conservation, Development And Utilization Of Delaware River Basin Water Resources › Allocation of Water Resources › Section 890.9 - Schedule of phased reductions in diversions, releases and flow objectives during drought

Current through Register Vol. 46, No. 28, July 10, 2024
(a)
Criteria defining conditions.
For purposes of water management pursuant to section
						3.3 and article 10 of the compact,
						diversions of water from the Delaware River Basin by the City of New York and
						State of New Jersey, compensating reservoir releases from the New York City
						Delaware Basin Reservoirs, reservoir releases from Beltzville Reservoir, Blue
						Marsh Reservoir, and other reservoirs under the jurisdiction or control of the
						commission, and streamflow objectives at the USGS gaging stations located at
						Montague, New Jersey, and Trenton, New Jersey, shall be governed by a schedule
						based upon a differentiation among "normal", "drought warning", and "drought"
						conditions defined by the combined storage in the Cannonsville, Pepacton and
						Neversink Reservoirs as set forth in Figure 1 entitled "Operation Curves for
						Cannonsville, Pepacton and Neversink Reservoirs". The division of the
						drought-warning zone into upper and lower halves shall be defined as a
						physically equal division, or 20 billions of gallons in each zone.
(b)
Schedule of
					 reductions.
The schedules of phased reductions set forth in Tables 1
						and 2 shall govern (1) the maximum allowable rates of diversion of waters from
						the Delaware River Basin by the City of New York and State of New Jersey; (2)
						the minimum compensating releases to be made by the City of New York from its
						reservoirs in the upper Delaware Basin; and the streamflow objectives at the
						USGS gaging stations located at Montague, New Jersey and Trenton, New
						Jersey.
TABLE 1
Interstate Operation Formula for Reductions In
						Diversions, Releases, and Flow Objectives During Periods of
						Drought
NYC Storage
									 Condition
NYC Div.
									 mgd
NJ Div.
									 mgd
Montague Flow
									 Objective cfs
Trenton Flow
									 Objective cfs
Normal
800
100
1750
3000
Upper Half- Drought Warning
680
85
1655
2700
Lower Half- Drought Warning
560
70
1550
2700
Drought
520
65
1100-1650*
2500-2900*
Severe Drought (to be negotiated based
								  on conditions)
*
Varies with time of year and location of salt front as
						shown on Table 2.
TABLE 2
Flow Objectives for Salinity Control During Drought
						Periods
Seven-day
								  Average
Flow Objective,
									 Cubic Feet Per Second At:
Location of "Salt Front,"
								  River-mile
*
Dec-Apr
May-Aug
Sept-Nov
Dec-Apr
May-Aug
Sept-Nov
Upstream of R.M. 92.5
1600
1650
1650
2700
2900
2900
Between R.M. 87.0 and R.M. 92.5
1350
1600
1500
2700
2700
2700
Between R.M. 82.9 and R.M. 87.0
1350
1600
1500
2500
2500
2500
Downstream of R.M. 82.9
1100
1100
1100
2500
2500
2500
* Measured in statute miles along the navigation channel
						from the mouth of Delaware Bay.
During "drought" conditions as defined by Figure 1, the
						streamflow objectives at the Montague and Trenton gaging stations shall be
						established as set forth in Table 2, in accordance with the seven-day average
						location of the 250 mg/l isochlor (the "salt front") in the Delaware
						Estuary.
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(c)
Diversion allowances and release requirements.
(1) The City of New York may divert waters
					 from the Delaware Basin at maximum rates equivalent to the quantities set forth
					 in Table 1.
(2) The State of New
					 Jersey may divert waters from the Delaware River Basin, from the Delaware River
					 or its tributaries in New Jersey, at maximum rates equivalent to the quantities
					 set forth in Table 1.
(3) The City
					 of New York shall release water from one or more of its storage reservoirs in
					 the upper Delaware Basin in quantities designed to maintain the minimum basic
					 rates of flow at the USGS gaging station located at Montague, New Jersey, as
					 set forth in Tables 1 and 2.