Agenda - 03-10-1987 - Laserfiche WebLink

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177 RURAL BUFFER IMPLEMENTATION MEASURE Protected Watershed II (PW II) Descrietion The Protected Watershed II (PW II) is a zoning classifi- cation in the Orange County Zoning Ordinance. It is an overlay zone. That is, its requirements are added to the requirements of another zoning classification that has been applied to the land. The purpose of the district is to regulate the use of Land and structures on that land in watersheds which drain to reservoirs supplying drinking water to the people of Orange County. • Both the permitted use of Land and regulation of Lot sizes in the PW II will be determined by the . underlying zoning classification. The PW II regulations will further define how these uses are permitted. These regulations cover several areas. They establish required. buffers along peren- nial streams . Stream buffers are located at the outer edge of identified floodplains and are measured in width as fifty (50) feet plus four (4) times the average rise in elevation measured perpendicularly 250 feet from the center of the stream. The maximum buffer width is limited to 150 feet. Uses within the stream buffer are limited to above ground and buried local distribution utility lines, farms, neighborhood utility facilities, public or private streets, bridges, and railroad rights-of-way. Existing vegetation in the stream buffer cannot be removed. Vegetation on the remainder of a lot in PW II is to remain undisturbed to the maximum extent possible. In order to promote infiltration of stormwater runoff into the soil, a Limit is placed on the area of a Lot that can be made impervious to the infiltration of water. This limit is set at 12% of the lot area when public water and sewer are not available and 30% of the lot area when they are available. Lots for non-residential uses are required to be larger in a PW II district . Commercial lots must be at least 80,000 square feet and industrial lots must be 200,000 square feet . Industrial uses are limited to light industrial uses. All new developments in PW II must install stormwater control measures to control the first one--half inch (112") of runoff from impervious surfaces. This initial runoff con- tains most of the pollutants that accumulate on-site. Its control on-site prevents their entering the water supply. Aeelication The PW II district has been applied to the watersheds of the Cane Creek and University Lake reservoirs, and to the zoned portion of the Upper Eno basin which includes the proposed Seven Mile Creek reservoir. Refetgnces Orange County Zoning Ordinance, Articles 4.2.28, and 6.23.