Retention ponds why do we need them? My sub-division has two. Can’t the water just get drained to the river?
In: Engineering
Houses and streets don’t absorb as much water as trees, grass, bare dirt, whatever. So when it rains more water washes downhill from a subdivision than a natural area.
That higher flow causes erosion. To stop it, the water is sent into a detention pond and is allowed to drain at a rate similar to what it would have drained before construction.
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