• Corporate HQ, NY
  • Melville, NY
  • Iselin, NJ
  • Ossining, NY
  • Mount Laurel, NJ

Kincaid Lake Dam Hydrologic/Hydraulic Study


HAKS prepared a hydrologic and hydraulic study of the Kincaid Lake Dam and contributing drainage areas and structures to analyze its hydrologic and hydraulic functionality and capacity of the dam for the purpose of dam classification. The dam structure for the impoundment of Kincaid Lake is a concrete structure that is integral to a Gloucester County concrete bridge.  In coordination with the New Jersey Department of Environmental Protection Dam Safety section, HAKS prepared a detailed field investigation of the dam and its immediate upstream and downstream areas as well as several upstream contributing structures.  The downstream area of the Kincaid Lake Dam drains into a tributary of the Raccoon Creek, which then flows under the Harrisonville Road Bridge, which was the analysis point utilized by HAKS to determine the effect of the dam on downstream developed areas.

The analysis was prepared utilizing detailed information obtained in the field, published USGS Quadrangle Mapping and aerial photography.  The drainage sheds were established and corresponding curve number values and time of concentration for each utilizing TR-55 methodology.  The drainage shed information was then routed utilizing the U.S. Army Corps of Engineers’ HEC-HMS hydraulic model, which analyzed the capacity of the existing culvert within the dam as well as the flow capability of the overtopping emergency spillway.  The results of the analysis were routed and combined into a stream step backwater analysis of a portion of the Raccoon Creek utilizing an HEC-RAS model.  Alternative analyses were performed to compare the function of the existing dam structure to the downstream flows achieved during a breach/failure condition.  Based on these findings, HAKS prepared a detailed hydrologic and hydraulic report with a recommendation for the dam classification and the spillway design flow.