01632215

Monograph

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

This report provides a practical watershed-based decision-making framework and spreadsheet-based Watershed-Based Stormwater Mitigation Toolbox 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. Using the watershed approach developed by the U.S. Environmental Protection Agency, the framework accommodates varying degrees of extant watershed planning, is applicable in a variety of watershed types, and includes methods to demonstrate the net environmental benefit of potential water quality solutions. The Watershed-Based Stormwater Mitigation Toolbox considers conditions under which conventional onsite best management practices (BMPs) are infeasible or inadequate, contains conventional BMPs and mitigation options that augment conventional BMPs, offsite water quality solutions (e.g., outside of the project area or right-of-way), and solutions that mitigate water quality impacts from existing and new impervious surfaces.

Project 25-37

English

126p

2017

NCHRP Research Report

9780309446150

Print

Appendices; Figures; Glossary; References; Tables

Best practices; Decision support systems; Runoff; Water quality management; Watersheds

Environment; Highways; Hydraulics and Hydrology

TRIS, TRB, ATRI

Apr 5 2017 11:03PM