07/25/2007 Env Bd Packet - Laserfiche WebLink

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• • • Detention basin - any natural or man -made depression that stores storm - water runoff temporarily. Development - any proposal to subdivide land, any land disturbing activity or creation of impervious surface, including but not limited to, municipal road construction or improvement and construction or reconstruction of stormwater conveyance systems, except that plowing as part of an en- goingongoing farming operation shall not be considered development. District - the Rice Creek Watershed District established under the Minnesota Watershed Law, Minnesota Statutes Chapter 103D. Drainage system - a system of a ditch or tile, or both, to drain property, including laterals, improvements, and improvements of outlets. method of determining flood sews Excavation - the displacement or removal of sediment or other material. Floodplain - the area adjoining a watercourse or natural or man -made water basin, including the area around lakes, marshes and lowlands, that is inundated during a 100 -year flood. Floodway - the channel of the watercourse, the bed of water basins, and those portions of the adjoining floodplains that must be kept free of encroachment so that the 100 -year flood may be carried without increasing the 100 -year flood elevation by more than 0.5 feet. Floodway fringe - the area between the floodway and the boundary of the 100 -year flood. Governmental project - projects sponsored or paid for by a governmental agency. Landlocked basin - a basin that does not have a natural outlet at or below the 100 -year flood elevation, as determined by the 100 -year ten -day runoff event. Low floor - the lowest level of a structure, usually the basement or walk -out level. Major drainageway - any drainageway having a tributary area of 200 acres or greater. Mill and overlay — removal of the top layer of bituminous pavement of a roadway or street by n • - it lt• LL- i t- • 1•W-• • kt- bituminous or concrete pavement. Municipality - any city or township wholly or partly within the Rice Creek Watershed District. NPDES Permit — General permit authorization to discharge storm water associated with construction activity under the national Pollutant Disch. r• Elimi i• n stem NPDES). issued by the Minnesota Pollution Control Agency. DRAFT DOCUMENT 6