What Is Stormwater?

Stormwater is runoff generated by rain or snowmelt from impervious areas or surfaces such as paved streets, parking areas, and building rooftops, or from pervious surfaces when more rain is falling than can soak into the ground. Impervious surfaces do not allow the rainfall to soak into the soil surface, causing the rainfall to become runoff. This runoff can enter a storm sewer system, which ends up in local streams, creeks, rivers, lakes, and coastal waters.

Why Worry about It?

Storm Drain Cover and a Sanitary Sewer Cover

There is a major difference between what is beneath each of these manhole covers.



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