A channel or passage that allows excess water to flow from a dam, reservoir, or other water control structure to prevent overflow and potential structural damage. Spillways can be natural or artificially constructed.
From 'spill' (to overflow) + 'way' (a path or route). The term developed in 19th-century hydraulic engineering as dam construction became more sophisticated and the need for controlled water release became critical.
The spillway at Hoover Dam creates one of the most dramatic examples of human-controlled geography – when opened, it can release enough water to fill an Olympic swimming pool every second! These engineering marvels literally reshape how water moves across landscapes, creating new geographic realities.
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