spill·way

[spil-wey]
noun
a passageway through which surplus water escapes from a reservoir, lake, or the like.

Origin:
1885–90; spill1 + way1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
spillway (ˈspɪlˌweɪ) [Click for IPA pronunciation guide]
 
n
wasteweir, Also called: spill a channel that carries away surplus water, as from a dam

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Spillway is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a scrap or morsel of food left at a meal.
Encyclopedia Britannica
Encyclopedia

spillway

passage for surplus water over or around a dam when the reservoir itself is full. Spillways are particularly important safety features for earth dams, protecting the dam and its foundation from erosion. They may lead over the dam or a portion of it or along a channel around the dam or a conduit through it.

Learn more about spillway with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The spillway is designed to provide a safe path for the excess flows.
During that period, the hydro power was turned down causing excess water to go
  over the spillway.
Water that goes over a spillway as opposed to through a turbine picks up
  bubbles of nitrogen gas from the atmosphere.
Then, water from the spillway re-enters downstream of the dam.
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