Definitions for "Urban Runoff"
That portion of precipitation that does not naturally percolate into the ground or evaporate, but flows via overland flow, underflow, or channels or is piped into a defined surface water channel or a constructed infiltration facility (Washington Department of Ecology, 1992).
Surface runoff from urbanized areas (such as streets, parking lots, retail malls, residential developments, subdivisions. etc.).
Water that runs off land in towns and cities.