Collecting it also reduces runoff of storm water to the nearby Potomac River.

VOA: special.2011.07.08

"Excessive runoff from this storm will cause flooding of small creeks and streams" and affect low-lying areas.

CNN: Flash flooding bears down on Chicago

The students designed a progressive urban environment that can handle large amounts of storm-water runoff by using green technologies and major roadways as storm-water filtration and transport surfaces.

WHITEHOUSE: The White House

The Trust has advocated effectively for a Green Streets approach to managing storm water runoff.

WHITEHOUSE: Champions of Change Blog