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Percent Impervious

The percentage of a given area that will not allow water to infiltrate. The greater the percentage of impervious cover, the more runoff that will occur.

Percolation

The flow of water within the soil profile once it has moved through the soil surface.

Permeable Pavement

Includes several methods and materials, such as blocks, concrete and asphalt, that allow water and air to move through the pavement and into the underlying soil.

Also known as Pervious Pavement or Porous Pavement.

Permittee

Anyone that holds a permit from an issuing agency. An industrial user required to maintain an industrial waste permit, issued by MSD, due to the quality or quantity of their wastewater or point of discharge into the MSD sewer system.

Pervious Pavement

Includes several methods and materials, such as blocks, concrete and asphalt, that allow water and air to move through the pavement and into the underlying soil.

Also known as Permeable Pavement or Porous Pavement.

Point of Discharge

Any discernible, 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.

Also known as Point Source.

Point Source

Any discernible, 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.

Also known as Point of Discharge.

Point Source Pollution

Pollution that enters the environment from a single point such as a factory, an oil or chemical spill, a municipal wastewater treatment plant, or a stormwater discharge pipe.

Pollutant

Any substance which, alone or in combination with other substances, if discharged to waters of the State in sufficient quantities, causes or is reasonably certain to cause any alteration of the physical, chemical or biological properties of such waters; or to create a nuisance; or to render such waters harmful, detrimental or injurious to public health, safety or welfare, or to domestic, industrial, agricultural, recreational, or other legitimate beneficial uses or to any organism, aquatic life, plant or animal.

Porous Pavement

Includes several methods and materials, such as blocks, concrete and asphalt, that allow water and air to move through the pavement and into the underlying soil.

Also known as Permeable Pavement or Pervious Pavement.

POTW

Publicly owned treatment works

Project Clear

MSD Project Clear is a long-term initiative to improve water quality and alleviate many wastewater concerns in the St. Louis region.  It will invest billions of dollars over a generation in planning, designing, and building community rainscaping, system improvements, and through an ambitious program of maintenance and repair.

Pump Station

Installation of pumps to lift wastewater to a higher elevation in places where flat land would require excessively deep sewer trenches. Also used to raise wastewater or stormwater from areas too low to drain into available collection lines.

Also known as Lift Station.