NOTICE: has been archived.

The archive will be available at for approximately one year (through September 2020). If you use or are responsible for content here that is not yet available elsewhere, please contact the PWD Digital Team.

Glossary beginning with P

terms for which definitions are available

PA Act 167

Stormwater Management Act


Pennsylvania Department of Conservation and Natural Resources


Pennsylvania Department of Environmental Protection

peak discharge

the maximum rate of stormwater runoff from a specific storm event


Pennsylvania Environmental Council


Pennsylvania Fish and Boat Commission


an oxidized form of phosphorus, which may be organic or inorganic; inorganic phosphates are generally more likely to be available as nutrients for biological growth


a culvert, closed conduit, or similar structure (including appurtenances) that conveys stormwater

point source

pollution discharged from a single point, defined in the Clean Water Act as “any discernable, confined and discrete conveyance, including but not limited to any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal feeding operation, vessel, or other floating craft from which pollutants are or may be discharged.”


period after construction during which disturbed areas are stabilized, stormwater controls are in place and functioning, and all proposed improvements in the approved land development plan are completed


prior to commencing construction activities


techniques employed in stormwater Best Management Practices to provide storage or filtering to trap coarse materials and other pollutants before they enter the system


Philadelphia Water Department