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spillway

[spil-wey] /ˈspɪlˌweɪ/
noun
1.
a passageway through which surplus water escapes from a reservoir, lake, or the like.
Origin
1885-1890
1885-90; spill1 + way1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for spill-way

spillway

/ˈspɪlˌweɪ/
noun
1.
a channel that carries away surplus water, as from a dam Also 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
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Encyclopedia Article for spill-way

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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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