What’s the Difference between Detention and Retention?
https://www.conteches.com/knowledge-center/learn/the-stormwater-blog/what-s-the-difference-between-detention-and-retention/
WEBHowever, the terms have very different meanings. By definition, a detention BMP is an area where stormwater is temporarily stored, or detained, and is eventually allowed to drain slowly when water levels recede in the receiving channel. On the other hand, retention stormwater BMPs hold or retain stormwater on a more permanent basis.
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