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​Post-Construction Site

​MS4s are required to develop and implement a post construction program with the ultimate goal of preventing or reducing pollutant runoff from new development and redevelopment sites.  These are sites that disturb one or more acres or are part of a larger common plan of development or sale. The developers are required to provide best management practices, such as vegetated swales, extended detention basins, or other water quality treatment measures, that must be included in the construction of those projects. Post-construction runoff controls, best management practices, help to reduce pollutant loads from being transported off of a developed site, as well as decreasing the quantity of water being delivered to water bodies during storm events.