simulation of groundwater response to development: central passaic river basin, nj fatoumata barry...
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Simulation of groundwater Simulation of groundwater response to development:response to development:
CENTRAL PASSAIC RIVER BASIN, NJCENTRAL PASSAIC RIVER BASIN, NJ
Fatoumata BarryFatoumata Barry1,21,2, Duke Ophori, Duke Ophori11, Jeffrey L. Hoffman, Jeffrey L. Hoffman22 and and Robert CanaceRobert Canace22
11Department of Earth & Environment Studies, Montclair Department of Earth & Environment Studies, Montclair State University, Upper Montclair, NJ 07043State University, Upper Montclair, NJ 07043
22New Jersey Department of Environmental ProtectionNew Jersey Department of Environmental ProtectionP.O. Box 427, Trenton, NJ 08625P.O. Box 427, Trenton, NJ 08625
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Issues
Increased demand of water Due to population growth
Decline of water levels Due to increase withdrawals
Decreased recharge Due to urban development
Contamination Have limited withdrawal in some areas
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Objectives
Develop a regional GW flow model to simulate: flow paths contaminants paths contaminants source protection areas around wells
Delineate regional discharge and recharge areas
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Study Area
WAYNE TWP
BERNARDS TWP
HARDING TWP
WARREN TWP
PASSAIC TWP
LIVINGSTON TWP
MONTVILLE TWP
HANOVER TWP
PARSIPPANY-TROY HILLS TWP
CHATHAM TWP
FAIRFIELD BORO
MORRIS TWP
EAST HANOVER TWP
MILLBURN TWP
SUMMIT CITY
FLORHAM PARK BORO
LINCOLN PARK BORO
PEQUANNOCK TWP
MADISON BORO
WEST CALDWELL BORO
ROSELAND BORO
BERKELEY HEIGHTS TWP
CHATHAM BORO
NEW PROVIDENCE BORO
TOTOWA BORO
NORTH CALDWELL BORO
WEST ORANGE TOWNMORRISTOWN TOWN
FAR HILLS BORO
POMPTON LAKES BORO
ESSEX FELLS BORO
BOONTON TOWN
CALDWELL BORO
BERNARDSVILLE BORO
MORRIS PLAINS BORO
WATCHUNG BORO
LITTLE FALLS TWP
RIVERDALE BORO
OAKLAND BORO
CEDAR GROVE TWPMOUNTAIN LAKES BORO
HALEDON BORO
BRIDGEWATER TWP
KINNELON BORO
BRIDGEWATER TWP
VERONA BORO
FRANKLIN LAKES BORO
NORTH HALEDON BORO
BEDMINSTER TWP
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0
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3
1
Hackensack – Passaic River Basin
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FAIRFIELD
LINCOLN PARK
CHATHAM
TROY HILLS
MONTVILLE
SOUTHERN MILLBURN
NORTHERN MILLBURN
FLORHAM PARK
EAST HANOVER
CEDAR KNOLLS
PARSIPPANY
LONG HILLOAKWOOD
SUMMITGREEN VILLAGE
CANOE BROOK
SLOUGH BROOK
Model Design Conceptualization
Sandstone, Siltstone
Basalt
Silt, Clay (Semi-confining Unit)
BEDROCK(LAYER 3)
SURFACIAL
Sand and GravelLAYER 1
Layer 1
Layer 2
Layer 3
Sand and Gravel(LAYER 2)
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Model Design - Boundaries
Lateral: Western edge: Ramapo Fault (Granite
on West side of fault) Northern, Southern and Eastern edge:
Crest of the 2nd Watchung Mountain Vertical:
Top: Surface water Rivers, lakes, wetlands
Bottom: Bedrock
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Data InputData Input
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Input Data Sets
Aquifer Parameters: specified for each grid cell within each layer
Hydraulic Conductivity Transmissivity Storage coefficients Initial water levels Botton and Top elevations Vertical leakance to account for the hydraulic
connection between adjacent layers. Pumping Wells Observation Wells Recharge values River Data
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Flow Simulation
Modeling was done using the MODFLOW and MODPATH codes in the GMS package
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Simulation ResultsSimulation Results
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Steady State Calibration Surface and Heads of Unconfined Sand and Gravel comparison
Layer 1 Surface Elevation
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1990 Computed and Observed Water Level
0
50
100
150
200
250
300
350
400
450
500
550
0 50 100 150 200 250 300 350 400 450 500 550
Computed vs. Observed ValuesTrans. Head
Com
pute
d
Observed
0
50
100
150
200
250
300
350
400
450
500
550
0 50 100 150 200 250 300 350 400 450 500 550
Computed vs. Observed ValuesTrans. Head
Com
pute
d
Observed
Original
Calibrated
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InterpretationInterpretation
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Prepumpage (1898) versus Recent (1995) Wetlands in unconfined sand and gravel
1898 1995
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Unconfined Sand and Gravel Discharge Areas
1898 1995
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Semi-confined Sand and Gravel Discharge Areas
1898
1995
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Decline of Water Levels between 1898 and 1995
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Hanover Twp - Heads and Flow vectors 1929 -1974
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Hanover Twp - Heads and Flow vectors 1979 -1995
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East Hanover, Parsippany Twps - Capture Zones Analysis
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Conclusion
Benefit from the model Wetlands reduced from prepumping to
pumping conditions Discharge areas reduced after pumping started Temporal flow patterns easily visualized Decline of groundwater levels can be visualized Analytical and Numerical Capture zones
compared Analytical capture zones found to be
conservative
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Questions and CommentsQuestions and Comments
Thank youThank you