Hydrologic effects of possible changes in water-supply withdrawals from, and effluent recharge to, the Kirkwood-Cohansey aquifer system, Winslow Township, Camden County, New Jersey

First posted March 7, 2023 For additional information, contact: Director, New Jersey Water Science CenterU.S. Geological Survey3450 Princeton Pike, Suite 110Lawrenceville, NJ, 08648Contact Pubs Warehouse Winslow Township and the Camden County Municipal Utility Authority (CCMUA) developed a plan to shut down sewage-treatment facility associated effluent infiltration transfer CCMUA on Delaware River in Camden, Jersey. reduced groundwater withdrawals from Kirkwood-Cohansey aquifer system offset recharge lost with cessation of infiltration. The U.S. Survey, cooperation CCMUA, collected data evaluate conditions prior installed two continuous-record streamflow-gaging stations. Streamflow measurements also were made at low-flow partial-record sites, levels measured 17 wells high low water-level periods (May September 2010). A groundwater-flow model provides estimated changes base flow Great Egg Harbor under several groundwater-withdrawal scenarios.Water an observation well 480 feet (ft) lagoons during 1971–2010. downward trend water 1985 is attributed part increased impervious surfaces development area that began early 1970s. From late 2010, there was upward construction nearby increasing rate period. Recent historical four surface-water sites correlated same-day discharges three index stations estimate continuous record sites. Effects caused by reductions or could not be ascertained available statistical analysis methods used.Groundwater discharge streams (base flow) simulated Mullica Basins. Simulated monthly flows using 2008–10 withdrawal rates (Scenario 1) are generally about 1.5 million gallons per day (Mgal/d) greater than 2003–07 (Baseline Scenario) because 1.57 Mgal/d reduction average 2008–10. but without 2) very similar to, typically slightly lower than, Baseline Scenario flows.Three hypothetical future distributions existing simulated, each same as 2, different among wells. 3 4 all months, 5 less months. simulation results indicate offsets rate, resulting nearly unchanged near Blue Anchor (01410820).