Integrated Stormwater Management (iSWM)™

integrated Stormwater Management (iSWM)™ logo

Development and redevelopment by their nature increase the amount of imperviousness in our surrounding environment. This increased imperviousness translates into loss of natural areas, more sources for pollution in runoff, and heightened flooding risks. To help mitigate these impacts, more than 60 local governments are cooperating to proactively create sound storm water management guidance for the region through the integrated Stormwater Management (iSWM) program.

The iSWM Design Manual for Site Development and Design Manual for Construction are cooperative initiatives that assist cities and counties to achieve their goals of water quality protection, streambank protection, and flood control. They also help communities meet their construction and post-construction obligations under state storm water permits.