2005 BES Annual Meeting Presentation and Poster Abstracts
A cost-effective stormwater management plan for a urban watershed --Pond or Bioretention?
Jason Zhao, Ken Belt, Richard Pouyat, Upal Ghosh
Abstract: Alone with the increasing urbanization and the reduction of point source pollutants, urban stormwater runoff and non-point source (NPS) pollution has became the biggest pollution since late 1980ís. Many Best Management Practices to controls stormwater quality and quantity have been developed and implemented across the country. Besides conventional centralized Best Management Practice (BMP) such as detention ponds, distributed stormwater treatment BMPs are becoming more and more accepted. In this study we analyzed both conventional and distributed BMPs. Based on the characteristic of watershed 263, a detailed watershed-wised BMP management plan was proposed and optimized to minimize the cost. The optimized plan will cost only 50% of a more typical engineering based plan and meet the NPDES requirement. In this study we found that centralized BMPs such as wet pond or wetland are still the most cost-effective BMPs. Yet due to the scarcity of suitable land in highly urbanized area, distributed BMPs such as Bioretention play an important role in the strategy plan. We will discuss the pros and cons of Bioretention and how policy and latest research will affect the application of Bioretention in urban watershed.