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May. 31, 2017 The National Academies of Sciences, Engineering, and Medicine

A Watershed Approach to Mitigating Stormwater Impacts

A Watershed Approach to Mitigating Stormwater Impacts

The Transportation Research Board’s (TRB's) National Cooperative Highway Research Program (NCHRP) Research Report 840: A Watershed Approach to Mitigating Stormwater Impacts provides a practical decision-making framework that will enable state departments of transportation (DOTs) to identify and implement offsite cost-effective and environmentally beneficial water quality solutions for stormwater impacts when onsite treatment and/or mitigation is not possible within the right-of-way. The multi-year research effort was led by the Low Impact Development Center, Inc. along with Geosyntec Consultants, Michael Baker International, and an interdisciplinary research team. The research includes the development of the Watershed Based Stormwater Mitigation Toolbox (WBSMT), a Microsoft Excel-based program to facilitate the characterization of the project watershed and the identification of mitigation options at the planning level. The WBSMT uses readily available national datasets and can be used to evaluate common stormwater pollutants of concern. It can easily be adapted for evaluating targeted regional and local datasets and complex and emerging watershed protection issues, such as ecosystem services. The research report and the WBSMT can be found at:

http://www.trb.org/NCHRP/Blurbs/175861.aspx