The project has been completed and the final report submitted to AASHTO.
In 2008, the New Hampshire Department of Transportation was issued a number of Water Quality Certifications by the NH Department of Environmental Services (DES) that require a “No net increase” for pollutants in storm water leaving a proposed facility. To aid the applicant in meeting this requirement, DES has issued “Interim BMP Guidance to Satisfy Loading Analyses.” One concern was the applicability of the guidance to rural sections of highway where there is no proposed closed drainage system. The objective of this research proposal was to review the literature and other states’ guidance to come to a common understanding of how highway storm water treatment is modeled throughout the country, share best practices and develop guidance for effective storm water treatment on rural highways.
