Why is stormwater runoff a problem?

As precipitation falls on undeveloped areas, it is primarily absorbed into the ground or slowly runs off into streams, rivers or other water bodies. However, development resulting in rooftops and paved areas prevents water from being absorbed and creates a faster rate of runoff. Developed areas generate up to 9 times as much runoff as undeveloped areas. This development often causes localized flooding or water quality issues. According to the 1996 National Water Quality Inventory, stormwater runoff is a leading source of stormwater pollution.

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