How does impervious cover impact volume of stormwater runoff?
Impervious cover increases the quantity of runoff by keeping stormwater from soaking into the ground naturally. Increased volumes and velocities of runoff then erode stream channels and reduce the health of existing streams. Because water runs more rapidly off of an impervious area, flooding becomes both more common and more intense downstream. Meanwhile, because less water is soaking into the ground, water tables can drop and streams and wells fed by groundwater can begin to dry up.

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1. What is impervious cover?
2. How does impervious cover impact volume of stormwater runoff?
3. Why is stormwater runoff polluted?
4. What can I do to reduce my impact on stormwater runoff?
5. Where can I find more information about stormwater?