Hydrologic and Hydraulic Modeling for Green Stormwater Practices

Authors:

  • Jim Garin, P.E., and Dana Gumb - New York City Department of Environmental Protection
  • Brian Henn and Sandeep Mehrotra, P.E. - Hazen and Sawyer

The Staten Island Bluebelt Program focuses on addressing flood problems that are a result of natural landscape, tidal factors and a lack of drainage infrastructure. Using Best Management Practices (BMPs), New York City Department of Environmental Protection (DEP) seeks to mitigate stormwater flooding and improve water quality in a cost-effective manner by employing natural hydrologic features in a gravity-driven system. To quantify the potential benefits of BMPs in Staten Island’s New Creek watershed, a robust one-dimensional model was developed using United States Army Corps of Engineers HEC software. The model was calibrated to historical rainfall and tidal data and supplied with watershed information from a GIS land use database. It was then possible to test a variety of improvements, and the model showed that incorporating BMPs could result in a significant decrease in storm event peak water surface.

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Horizons Spring 2017 (pdf)

Horizons showcases significant water, wastewater, reuse, and stormwater projects and innovations that help our clients to achieve their goals, and can help you achieve yours. Articles are written by top engineers and process group leaders, demonstrating and explaining the beneficial application of a variety of technologies and tools.

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