BioScience Dictionary

 
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Found Retention basin 1 time.

Displaying results 1 to 10.

1. Retention basin (retention dam)
A flood control structure that holds back flood water for a short period to take the peak off a downstream flood. The dam on a retention basin is usually provided with an opening too small to allow the full flood flow to pass. This restriction forces water to collect in the basin behind the dam, but as soon as the storm peak passes the basin quickly drains. Most of the time the basin is dry.