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

2

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

3

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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4

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0

6

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

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

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

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

Questions and CommentsQuestions and Comments

Thank youThank you