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

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



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



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




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 unconfined sand and gravel

1898

1995


Semi confined sand and gravel discharge areas
Semi-confined Sand and Gravel Discharge Areas unconfined sand and gravel

1898

1995






Conclusion
Conclusion unconfined sand and gravel

  • 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 Comments unconfined sand and gravelThank you


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