It’s pouring outside. A slow-moving September thunderstorm dumps soaking rain, accompanied by flashes of lightning and cracks of thunder. Raindrops fall on driveways, rooftops and roads that flow towards the nearest storm drain, creating racing rivers of stormwater along the curb line. The water carries any leaves, oil, trash, and pet waste on the surface into storm sewers that flow to lakes and the Mississippi River without treatment. This stormwater pollution degrades water quality and ca...