Urban environments are full of impermeable surfaces. Without enough soil for stormwater to soak into, rain turns into run-off, carrying with it all the dirt, oil, and pollutants it picks up. To keep the run-off from turning into a flood, developers often use retention and detention ponds to collect and slowly release stormwater–sometimes with added measures to filter sediment and pollutants first. In this Practical Engineering video, Grady walks us through the logic of these artificial ponds and a few of the many ways they work. (Video and image credit: Practical Engineering)
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