Retention ponds why do we need them? My sub-division has two. Can’t the water just get drained to the river?
In: Engineering
Retention ponds help with pollution as well as cooling the water.
All of the storm sewers in your development lead to your retention ponds. When it rains (or snow melts), small rocks, road salt/ash, oil from the asphalt, oil and antifreeze that may have leaked from vehicles, trash are all washed down into the storm sewer the retention ponds collects most of this pollution and prevents it from entering nearby creeks and streams.
Have you ever noticed after a summer rainstorm steam rising from the road and driveways. This is because the 70 degree rainwater is hitting the hot asphalt and some of it evaporates. What doesn’t evaporate is heated and flows into the storm sewer. The retention ponds allows the hot water coming off the roads to cool down so the hot water doesn’t go directly to the creeks and streams and kill fish and temperature sensitive organisms.
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