Sediment is a water pollutant transported by storm water runoff. Storm water runoff is the major cause of impaired water quality in Georgia's streams, rivers, and lakes. Sediment harms fish and other aquatic life and can interfere with the recreational use of any water body. Many sedimentation problems are the result of inadequate erosion and sedimentation controls on constructions sites. Best Management Practices (BMPs) are designed to control soil erosion and sedimentation for 25-year, 24-hour rainfall events. BMPs are required under Georgia Erosion and Sedimentation Act and are enforced by the City of Covington.