new jersey’snew jersey’s water supply critical area no. 2 ian snook njdep water management...
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New Jersey’s Water Supply Critical Area
No. 2
Ian SnookNJDEP
Water Management Advisory Committee6-20-2019
Presented to an advisory committee of the DRBC on June 20, 2019. Contents should not be published or re-posted in whole or in part without permission of DRBC.
NJ Critical Areas
&
Delaware Basin
&
Pinelands
USGS Circ. 1186
• Withdrawals
create
drawdown.
• Cannot
withdraw water
without
drawdowns.
• Drawdowns pull
in water.
• Systematic measurements
• Snapshot of groundwater levels NJ
coastal plain
• Every 5 years since 1978
• Basis for many NJDEP decisions
Water Levels from USGS Synoptics
Walker, 1983
<-80’
Magothy
1978
Raritan,
Potomac
1978
Walker, 1983
<-80’
WATER SUPPLY MANAGEMENT ACT
The Legislature finds and declares that the water resources
of the State are public assets …
that ownership of these assets is in the State as trustee of the
people; …
the water resources of the State and any water brought into
the State must be planned for and managed as a common
resource …
Critical Area Implementation
• Defined and delineated depleted zone and threatened margin of CA aquifers.
• Reductions in allocations were ordered• Reductions in pumping
• Reduce threat of saltwater intrusion
• Allocation reductions phased in as alternate water sources became available. • NJAW Tri County Pipeline 1998
CA2 reductions starting in 1998 NJ American Water Delran Intake and Tri-County
pipeline came online
20,000
25,000
30,000
35,000
40,000
45,000
19
90
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91
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92
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94
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95
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96
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Mill
ion
s o
f G
allo
ns
Critical Area 2 PRM Groundwater Withdrawals
CA 2 PRM Withdrawals
https://www.nj.gov/dep/njgs/geodata/dgs10-3.htm
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,0001
99
0
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91
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92
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93
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Mill
ion
Gal
lon
s
Critical Area 2 Withdrawals by Use Group
Agriculture/Irrigation Industrial/Commercial/Mining Potable Supply
https://www.nj.gov/dep/njgs/geodata/dgs10-3.htm
Elm Tree 2Camden CoLower PRM
Elm Tree 3Camden CoMiddle PRM
Hutton Hill 1Camden CoUpper PRM
CA
2 G
rou
nd
wat
er L
evel
s
250 MG/L Chloride 250 MG/L Chloride
PRM Aquifer
Lower
Middle
Upper
-Future water-supply in the southwestern portion of CA2 and the Delaware Bay region are constrained by the presence of the saltwater front that bulges nearly to the Delaware River in Gloucester County. GW flow in this region is to the NE, under the influence of the regional cone of depression in the aquifer in Camden County.
New Jersey Water Supply Plan 2017-2022
• The Critical Area Management Plan implemented in 1991 and still in progress, has achieved significant reductions in withdrawals from the PRM aquifer. Declining withdrawals coupled with conservation measure and regional water supply alternatives have greatly increased the aquifers water levels.
• In the unconsolidated and middle portions of the PRM aquifer in Burlington and Camden counties, water levels have shown recoveries of nearly 50% of the pre-1970 levels.