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Low Impact Development Decision-Making to Evaluate Impacts of BMP Selection

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

Citation:  21st Century Watershed Technology: Improving Water Quality and Environment Conference Proceedings, 21-24 February 2010, Universidad EARTH, Costa Rica  701P0210cd.(doi:10.13031/2013.29422)
Authors:   John C Hayes, Charles V Privette, III, Elizabeth Tempel, David Willis, Matthew Huber
Keywords:   Low impact development, best management practice, post construction, water quality, LID

As upstate South Carolina continues to develop, stormwater runoff must be managed for its quantity and quality. Therefore, an incentive-based program to encourage developers to use low impact development (LID) designs is being developed for Greenville County. To achieve this goal, various best management practices (BMPs) were researched for their effectiveness and feasibility, and a post construction index (PCI) was developed to rate development. The PCI helps address questions about the benefit of small structures scattered around a development as compared to larger structures located near the outlet point and also considers economics of BMPs. The PCI is related to available parameters to scientifically anchor the PCI and make it directly related to stormwater runoff and water quality characteristics that reflect benefits of structural, non-structural, management and maintenance practices. The PCI is a function of nine (9) defined sub-factors with each having a range from zero to a maximum score of 5, 10, 15 or 20. Total scores for all sub-factors are used to differentiate between the water quality impacts of legacy, conventional, and innovative housing developments/LID designs.

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