spillway

Fluctuations in the lake due to floods are controlled by an immense spillway dam built of concrete.
The Wonder Book of Knowledge|Various
The spillway is so arranged that as the level of the water in the lake rises the discharging capacity increases.
The Panama Canal|Frederic Jennings Haskin
The spillway, too, if enlarged by explosives, would make a nasty hole to build up.
Boy Scouts in the Canal Zone|G. Harvey Ralphson
The spillway is a concrete-lined opening cut through a hill of rock near the center of the dam.
Boy Scouts in the Canal Zone|G. Harvey Ralphson

Behind was the bubbling, leaping flow of the spillway itself, and Gatun Dam.
Raiders Invisible|Desmond Winter Hall

British Dictionary definitions for spillway

spillway

/ (ˈspɪlˌweɪ) /

noun

a channel that carries away surplus water, as from a damAlso called: wasteweir, spill

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

spillway

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British Dictionary definitions for spillway