Minnesota Public Radio slideshow:
Urban runoff a toxic brew
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In the Twin Cities, about 13 percent of the land -- more than 250,000 acres -- is covered with impermeable surfaces such as parking lots, roads and driveways. That contributes to huge problems with stormwater runoff. (MPR Photo/Dan Olson)

In the Twin Cities, about 13 percent of the land -- more than 250,000 acres -- is covered with impermeable surfaces such as parking lots, roads and driveways. That contributes to huge problems with stormwater runoff.

(MPR Photo/Dan Olson)
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