Zoning Dictionary

Category: Water Related Terms

Storm Sewers

Subterranean piping constructed for the purpose of handling run-off from severe or heavy periods of precipitation. Sewers that carry storm water and surface water, street wash and other wash waters, or drainage, but not domestic wastewater or industrial wastes.

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Stormwater

The net increase in run-off from urban development due to water not being able to seep into the ground because of impervious surfaces, such as roofs and roads.

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Stormwater Network

A system of stormwater pipes, open channels, devices and associated ancillary structures used for the purpose of conveying, diverting, storing, treating, or discharging stormwater.

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Stream Channel

An area which demonstrates evidence of the passage of water. The depression between the banks worn by the regular and usual flow of the water. The channel need not contain water year-round. This definition does not include irrigation ditches, canals, storm or surface water runoff devices, or other entirely artificial watercourses.

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Streamflow Diversion

The impoundment and diversion of streamflow to pipes or channels, for the purpose of offstream use of water.

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Streamflow Regulation

The retention of portion of streamflow in a pond or reservoir for some period of time, for subsequent release downstream.

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Sub-watershed

A line dividing waters flowing into watercourses which are ultimately part of the same watershed.

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Surface Water

Water on the earth’s surface exposed to the atmosphere as rivers, lakes, streams, and oceans.

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Surface Water

Any freshwater waterbody located above the ground surface including lakes, rivers, streams, springs, water impounded by dams and wetlands.

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