It is a conveyance or system of conveyances that is:Designed or used to collect or convey stormwaterOwned by a state, city, town, village, or other public entity that discharges to waters of the U.S.Not a combined sewerNot part of a publicly owned treatment works (sewage treatment plant)Regulated conveyance systems include roads with drains, municipal streets, catch basins, curbs, gutters, storm d