Barrage
From BAWiki
Definition
A low dam or wall across a stream to raise the upstream water level. Termed fixed crest weir when uncontrolled.
Dam that blocks the entire valley cross-section beyond the cross-section of the watercourse. It usually consists of the main barrier with reservoirs and lockers (shut-off structures) with dumps or storage basins.
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Source
Glossary of Coastal & Hydraulics Laboratory (CHL), US Army Corps of Engineers (USACE), Vicksburg, USA;
translated from DIN 4048-1 by Ale & Hannah Carrizo