wasteway

Excess water route

A wasteway is a channel or passage designed to carry excess water away from a dam, reservoir, or irrigation system.

It functions as a safety valve, preventing overflow or damage during periods of heavy flow: The wasteway diverted floodwaters around the main structure.

The term appears mainly in engineering and water management contexts.

spillway

spillway

Dam's water release structure

bypass · outlet · discharge · diversion · floodgate · headgate · tailrace · outfall · chute · apron

drainage

drainage

Liquid removal system

outflow · runoff · stormwater · effluent · sedimentation · greywater · leachate · gutter · catch basin · drain

irrigation

canal

Dug water passage

tailwater · excess water · distribution · flood irrigation · furrow · turnout · offtake · regulator · water rights · seepage

Opposites
water channel function

wastewayheadrace

Channel supplying waterwheel

irrigation canal · aqueduct · water main

channel hierarchy

wastewaymain channel

Principal navigable passage

headworks · intake

Family

way, waste, wasted, highway, wasteful, wasting, pathway, wastes, wasteland

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Used worldwide · Timeless · Concrete · Rated G