The above video discusses the engineering needed for retention ponds. Basically, the ponds don't just capture and store excessive rainfall, rather they exist to regulate water runoff during storms. Regulating the flow of water to prevent, or at least minimize, flooding.
I live in Florida which has enormous amounts of water areas coexisting with the land. There are retention ponds everywhere, in fact there is one a couple of hundred yards away from my humble abode. I've never given much thought to them and how they function -- they were just ponds plopped down in new developments. It is interesting to see what purpose they actually serve and how they function.
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