Waterline

Maximum liquid level in a sewer pipe/structure during normal operating cycles.

Watershed

(1) A defined geographical area, usually delineated by high ground, that drains to a watercourse. (2) Region or area contributing to the supply of a stream or lake; drainage area, drainage basin, catchment area.

Weatherability

The properties of a plastic material that allows it to withstand natural weathering; hot and cold temperatures, wind, rain and ultraviolet rays.

WEF

Water EnvironmentThe surroundings or conditions (physical, chemical, mechanical) in which a material exists. Federation

Weir Manhole

A manhole that contains a weir used to measure flow.