Simulation of groundwater response to development central passaic river basin nj
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Simulation of groundwater response to development: CENTRAL PASSAIC RIVER BASIN, NJ. Fatoumata Barry 1,2 , Duke Ophori 1 , Jeffrey L. Hoffman 2 and Robert Canace 2 1 Department of Earth & Environment Studies, Montclair State University, Upper Montclair, NJ 07043

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Simulation of groundwater response to development: CENTRAL PASSAIC RIVER BASIN, NJ

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Simulation of groundwater response to development central passaic river basin nj

Simulation of groundwater response to development:CENTRAL PASSAIC RIVER BASIN, NJ

Fatoumata Barry1,2, Duke Ophori1, Jeffrey L. Hoffman2 and Robert Canace2

1Department of Earth & Environment Studies, Montclair State University, Upper Montclair, NJ 07043

2New Jersey Department of Environmental Protection

P.O. Box 427, Trenton, NJ 08625


Issues

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


Objectives

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


Study area

Study Area

Hackensack – Passaic River Basin


Model design conceptualization

Model Design Conceptualization

SURFACIAL

Sand and Gravel

LAYER 1

Silt, Clay

(Semi-confining Unit)

Sand and Gravel

(LAYER 2)

BEDROCK

(LAYER 3)

Sandstone, Siltstone

Basalt


Model design boundaries

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 input

Data Input


Input data sets

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


Flow simulation

Flow Simulation

  • Modeling was done using the MODFLOW and MODPATH codes in the GMS package


Simulation results

Simulation Results


Steady state calibration surface and heads of unconfined sand and gravel comparison

Steady State Calibration Surface and Heads of Unconfined Sand and Gravel comparison

Surface Elevation

Layer 1


1990 computed and observed water level

1990 Computed and Observed Water Level

Original

Calibrated


Interpretation

Interpretation


Prepumpage 1898 versus recent 1995 wetlands in unconfined sand and gravel

Prepumpage (1898) versus Recent (1995) Wetlands in unconfined sand and gravel

1898

1995


Unconfined sand and gravel discharge areas

Unconfined Sand and Gravel Discharge Areas

1898

1995


Semi confined sand and gravel discharge areas

Semi-confined Sand and Gravel Discharge Areas

1898

1995


Decline of water levels between 1898 and 1995

Decline of Water Levels between 1898 and 1995


Simulation of groundwater response to development central passaic river basin nj

Hanover Twp - Heads and Flow vectors 1929 -1974


Simulation of groundwater response to development central passaic river basin nj

Hanover Twp - Heads and Flow vectors 1979 -1995


Simulation of groundwater response to development central passaic river basin nj

East Hanover, Parsippany Twps - Capture Zones Analysis


Conclusion

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 comments thank you

Questions and CommentsThank you


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