Retention ponds why do we need them? My sub-division has two. Can’t the water just get drained to the river?
In: Engineering
No, the subdivision has a lot of hard surfaces that weren’t there before. More runoff is generated in the developed area than the undeveloped one. In order to reduce the potential for flooding downstream retention and detention features are developed to release the water slowly to prevent overwhelming local waterways.
In addition if the hold water most of the year it can help firefighting efforts to have accessible surface water in the case of wildfires and earthquakes.
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