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Great Falls of the Passaic River at Paterson, N.J

Great Falls of the Passaic River at Paterson, N.J.

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Hydrologic Changes Winslow Twp

Project Title:Hydrologic Changes Winslow Twp
Project Number: LJ00E5F
Project Chief:
Project Start Date: 01-MAR-2010
Project End Date: 31-MAY-2011

Project Objectives

  1. Ascertain the current hydrologic conditions relative to stream baseflow and related water-table elevations in the headwaters of the Great Egg Harbor River in the vicinity of the Kirkwood-Cohansey water supply wells and the waste- water recharge facility in Winslow Township, Gloucester County New Jersey.
  2. Predict likely changes in stream baseflow and water table elevation resulting from possible changes in water-supply withdrawals from the Kirkwood-Cohansey aquifer system and concurrent changes to inputs to waste water recharge lagoons.
  3. Determine the best well pumping or sequencing plan for Winslow Township Municipal Utilities Kirkwood-Cohansey water-supply wells to minimize depletion of stream baseflow.

Statement of Problem

The Kirkwood-Cohansey aquifer system underlies Winslow Township. Under natural conditions, water from the Kirkwood-Cohansey discharges to the perennial streams of the Great Egg Harbor River basin. This is referred to as the baseflow of the stream. Withdrawals by wells from the Kirkwood-Cohansey intercept ground water that would have discharged to a stream. In addition, if withdrawals are of sufficient intensity, the flow gradients near a stream can be reversed, inducing direct infiltration from the stream.

The infiltration of waste water from recharge lagoons will result in a rise in the water-table in the vicinity of the facility and, in the long term, will result in an increase in the ground-water discharge to streams in the vicinity.

The Township of Winslow, the Camden County Municipal Utilities authority, and the New Jersey Pinelands Commission have signed a Memorandum of Understanding that links the decommissioning of a waste-water recharge lagoon system with changes to the Kirkwood-Cohansey withdrawal rates. These parties have requested assistance from USGS to understand the hydrologic changes that may result from this action.

Strategy and Approach

The project is divided into 3 tasks. The 1st task is to set up a monitoring network of streamflow measurements and ground-water level measurements. The 2nd task is to use a ground-water flow model to predict likely hydrologic changes. The 3rd task is to prepare a report summarizing the findings.

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Page Last Modified: Monday, 14-Jan-2013 11:10:41 EST