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Rehabilitation of an Urban Washington, DC Watershed via Stream Daylighting, Restoration, Groundwater Recharge, Erosion Control and Community Outreach.

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  TMDL 2010: Watershed Management to Improve Water Quality Proceedings, 14-17 November 2010 Hyatt Regency Baltimore on the Inner Harbor, Baltimore, Maryland USA  711P0710cd.(doi:10.13031/2013.35738)
Authors:   Kevin M Donnelly, Aurore M Larson, Rocky Powell, Keith D Tate, Sepehr Baharlou
Keywords:   groundwater recharge, baseflow, bioretention, stream restoration, storm water BMP, water quality, rehabilitation, sediment, seepage wetlands, erosion

The Broad Branch watershed is a highly urbanized sub-watershed of Rock Creek located in Washington DC. Urbanization has affected the overall health of its streams and led to erosion and degradation of many of its tributaries. This project involves the restoration of approximately 1,600 linear feet of stream, which drains an approximately 170-acre sub-watershed and is currently piped beneath property owned by the National Parks Service and the District of Columbia. The stream restoration work will involve the use of storm water infiltration BMPs, and streambed protection to simulate a natural watercourse while slowing stormwater flows, allowing for more groundwater recharge and restoring the natural stream. The daylighting of the stream and the realignment of the existing streambed will be included in the restoration work. Groundwater recharge features, such as bioretention cells and regenerative step pools, are also included in the design.

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