A spillway is a structure used to provide the controlled releas... - dofaq.co
spillway

A spillway is a structure used to provide the controlled releas...

wikipedia - 13 Feb 2017
A spillway is a structure used to provide the controlled release of flows from a dam or levee into a downstream area, typically the riverbed of the dammed river itself. In the UK they may be known as overflow channels. Spillways ensure that the water does not overflow and damage or destroy the dam.

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