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" L ',.: <br /> the Neuse Basin, the Upper Eno sub-basin contains Lake <br /> Orange, Corporation Lake, and Lake Ben Johnson. These lakes <br /> serve Hillsborough, Efland, and portions of Alamance County. <br /> University Lake, draining the Morgan Creek sub-basin, and the <br /> Cane Creek Reservoir, both in the Cape Fear Basin, serve as <br /> water supply to Chapel Bill and surrounding areas. <br /> Because these areas contribute to the public health and <br /> safety in the form of drinking water supplies special land <br /> use protection measures are necessary for the areas' <br /> protection. Measure designed to ensure high water quality are <br /> discussed in later sections of the Land Use Element. <br /> Stream Systems - [section deleted] <br /> Floodplains - Floodplains are those areas which will be <br /> inundated by water in a specific storm event generally <br /> referred to as a "100-year flood" . Such a storm has a one <br /> percent probability of occurring in a given year. <br /> Floodplains can be further divided into two areas on the <br /> basis of hazard potential. The floodway is the area within <br /> and adjacent to the stream banks required to discharge the <br /> 100-year flood without raising the water surface elevation <br /> more than one foot above base flood level at any point. <br /> Obstacles in the floodway can disrupt this function, <br /> increasing the potential for flood damage. The floodway <br /> fringe is the area bordering the floodway which will be <br /> inundated during a flood and hold the floodwaters until they <br /> can be carried away in the floodway channel. <br /> In addition to the 100-year flood, consideration is also <br /> given the 500-year flood prone area. A 500-year flood is one <br /> with a probability of one in five hundred of occurring during <br /> a given year. The relative probability of these two storm <br /> events suggests fewer constraints, thus minimal or less land <br /> use regulation in the 500-year flood prone area. <br /> The U.S. Army Corps of Engineers prepared maps at a scale of <br /> 1"=1000' for_ Orange County showing both the 100 and 500-year <br /> floodway fringes for all streams draining more than one <br /> square mile of land. Orange County applied and was admitted <br /> to the federal Flood Insurance Program and subsequently <br /> adopted a Flood Damage Prevention Ordinance on March 2, 1981. <br /> This ordinance constitutes a major regulatory tool affecting <br /> the use of land constrained by flood hazards. <br /> 2.2 text 5 <br />