This manual lists various BMPs and design standards, which are acceptable in Pennsylvania to manage stormwater and prevent pollution of waters of the Commonwealth. Stormwater management plans and the BMPs designed according to these standards when properly applied, implemented and maintained, will achieve the Department’s water quality mandates established in 25 Pa. Code Chapter 93 and required by the federal Clean Water Act, federal NPDES regulations, the Pennsylvania Storm Water Management Act and the Pennsylvania Clean Streams Law. The proper utilization and implementation of these BMPs will protect and maintain existing uses and the level of water quality necessary to protect the existing uses, and will protect and maintain the water quality of high quality and exceptional value waters of the Commonwealth.