Where a consent decree adequately met the requirements of the Clean Water Act, the action was diligently prosecuted by United States.The 7th U.S. Circuit Court of Appeals affirmed a decision by U.S. District Judge George M. Marovich.Because the Chicago area is largely covered by concrete and other impenetrable surfaces, the ground is unable to fully absorb the water from heavy rains. The excess water goes into a combined stormwater and sewer system. When the system overflows, the water escapes through outfalls located on …