Length of time that a pollutant remains within a section of a stream or river. The residence time is determined by the streamflow and the volume of the river reach or the average stream velocity and the length of the river reach. An on-site system designed to treat and dispose of domestic sewage. A typical septic system consists of a tank that receives waste from a residence or business and a drain field or subsurface absorption system consisting of a series of percolation lines for the disposal of the liquid effluent. A channel or conduit that carries wastewater and storm water runoff from the source to a treatment plant or receiving stream.
Sanitary sewers carry household, industrial, and commercial waste.
Storm sewers carry runoff from rain or snow. Combined sewers handle both. Any person with a vested interest in the TMDL development. See the definition for Water quality standard. Discharge that occurs in a natural channel.