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Monitoring of Prospective Bridge Deck Runoff BMPs: Bioretention and Bioswale at Mango Creek/I-540

项目名称：	Monitoring of Prospective Bridge Deck Runoff BMPs: Bioretention and Bioswale at Mango Creek/I-540
摘要：	North Carolina Department of Transportation (NCDOT) is required by the National Pollutant Discharge Elimination System (NPDES) stormwater program to mitigate stormwater runoff from its facilities. NC Senate Bill 2008-107 further mandates runoff from bridge decks be evaluated and treated using best methods. Bioretention and bioswales show promise for stormwater treatment in the linear highway environment. Two bioretention cells and a bioswale were constructed in a Department of Transportation (DOT) maintained right-of-way underneath a bridge deck at the intersection of Mango Creek and I-540. One bioretention cell was sized correctly per North Carolina Department of Environment and Natural Resources (NCDENR) requirements, while the other has half the bowl storage and surface area that is required for its drainage area. The bioretention cells and bioswale were constructed using advanced practices, including internal water storage, engineered fill media, and specialized vegetation. Undersized bioretention cells have a high potential to be used as retrofits. However, little is known about their relative performance when compared to full-sized bioretention cells. This grant may allow NCDOT and NCDENR to award undersized bioretention cells a portion of the credit that full-sized cells receive. Also, this research will evaluate bioswale hydrologic and water quality performance. No research has been completed on bioswales in North Carolina. Monitoring of these practices began in November 2009 under NCDOT grant HWY-2009-29, but is forced to be completed by June 30, 2010. This grant proposal will allow continued monitoring of the bridge deck runoff quality, the undersized bioretention cells, and bioswale beyond FY 2010, essentially for a full year. Completing the data collection will allow the researchers to make appropriate conclusions about performance of each system.
状态：	Active
资金：	56237.00
资助组织：	North Carolina Department of Transportation
项目负责人：	Kirby, John W
执行机构：	North Carolina State University, Raleigh
开始时间：	20100816
实际结束时间：	20110815
主题领域：	Highways；Hydraulics and Hydrology；I15: Environment