What is the primary focus of a SWM plan?

The primary focus of a Storm Water Management (SWM) plan is to manage post-construction runoff. This is crucial because once construction is completed, the landscape and impervious surfaces such as rooftops, driveways, and roads can significantly alter the natural flow of water. Without proper management, this runoff can lead to increased flooding, erosion, and degradation of water quality in nearby streams and rivers.

An effective SWM plan is designed to control the quantity and quality of stormwater runoff that is generated after a construction project, ensuring that it mimics the pre-existing conditions as much as possible. This involves implementing various best management practices (BMPs) that can capture, filter, and treat the stormwater before it is discharged into local water bodies. This focus on managing post-construction runoff is vital in protecting water resources and maintaining the health of the surrounding ecosystem.

While preventing soil erosion, improving landscaping, and enhancing aquatic habitat are important considerations in broader environmental management efforts, they are not the primary objectives of a SWM plan, which specifically targets the challenges presented by runoff after construction.