I don't know the specifics, but those retention ponds for new developments have a couple of conditions
art of the purpose of the pond is to retain any hazardous spills on the property so remediation can be done before it gets into the general drainage system.The size of the ponds are defined to hold only a certain amount of rain on that property. Â Any more than that and it flows into the general drainage system.At chemical plants and refineries, we had a similar system. Â We captured the first few inches of rain in a large tank, then let the rest of the storm water drainage flow off the site. Â If we had had any spills, leaks, etc., the first few inches of rain flushed it into the tank. Â The water would then be tested for contaminants. Â If clean, the water was drained into the general offsite drainage system. Â If it was contaminated, it was appropriately treated before being released. Â Some locations used large retention ponds and others used an above-ground storage tank.
@Retired_Engineer:
I understand the spill concerns for petroleum tank farms, not so much for
retail operations - those will be very small at best.
Ahh never mind you are talking storm water management as opposed to building permitting. Two different things but tied together somewhat. 4951