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Where an underground drainpipe exits from belowground and discharges to the soil surface or a waterbody.  It also describes the process of uncovering or exposing some or all of the water flow from a previously covered stream, river, or drainage system.


The delay or holding of the flow of water and water-carried wastes in a pipe system. This can be caused by a restriction in the pipe, a stoppage or a dip. Detention also means the time water is held or stored in a basin or a wet well.

Discharge Permits

Permit granted by the missouri department of natural resources allowing the discharge of pollutants into a body of water. The point source must meet technology based limitations, and conform to specific water quality standards established for the receiving waters.


Refers to The Metropolitan St. Louis Sewer District or MSD. The District is organized pursuant to Article VI, Section 30 of the Missouri State Constitution that empowers the people in the City of St. Louis and St. Louis County “to establish a metropolitan district for functional administration of services common to the area.”


Department of Natural Resources: a Missouri state government agency responsible for the administration and enforcement of state water pollution control policies and laws.

Downspout Disconnection

The process of separating roof downspouts from the home’s lateral line, and thus the sewer system, redirecting roof runoff onto pervious surfaces, most commonly a lawn.

Drain Layer

A person trained and licensed to build or repair drains.

Drainage Facility

Any system of artificially constructed drains, including open channels and separate stormwater sewers used to convey stormwater, surface water or groundwater, either continuously or intermittently to natural watercourses.

Dry Weather Overflows

Discharges from a wastewater system in dry weather into a receiving stream rather than a treatment plant, usually as a result of a blockage or break in the system. Also called a non-capacity-related SSO.