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constructed in accordance with this chapter, based on specific terms and conditions of the • agreement. Stormwater management plan means a document containing material that describes how existing runoff characteristics will be maintained within a land development project, that describes controls for the management of the rate of Stormwater discharge, and that describes any best management practices provided for water quality protection. A stormwater management plan may include a narrative section, a map or site plan, pertinent calculations and specifications included with the plan. Stream buffer means an area of land at or near a tributary streambank and/or nontidal wetland that has an intrinsic water quality value due to the ecological and biological processes it performs or is otherwise sensitive to changes which may result in significant degradation to the quality of state waters. Subdivision means the division, including resubdivision, of any lot, tract or parcel of land into two (2) or more lots, tracts or parcels, for the purpose, whether immediate or future, of sale or building development. Water dependent facility refers to land development that cannot exist outside the stream buffer and must be located on a shoreline because of the intrinsic nature of its operation, including, without limitation: intake and outfall structures of water and sewage treatment plants and storm sewers; water -oriented recreation areas; and boat docks and ramps. Watershed means a defined land area drained by a river, stream or drainage ways, or system of • connecting rivers, streams, or drainage ways such that all surface water within the area flows through a single outlet. Wetlands, non -tidal means wetlands other than tidal wetlands that are inundated or saturated by surface or groundwater at a frequency and duration to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions, as defined by the U.S. Environmental Protection Agency pursuant to section 404 of the federal Clean Water Act. Sec. 10-6 Designation of program authority; powers and duties. (a) The city council hereby designates the department of neighborhood development services as the program authority for articles II, III, and IV. (b) The program authority shall administer and enforce the provisions of this chapter, acting by and through authorized city officials and employees. (c) The program authority shall establish reasonable regulations and interpretive guidelines for the administration of this chapter. Such regulations and guidelines shall be consistent with this chapter and all applicable federal and state statutes and regulations (including, without limitation, the provisions of Va. Code § 10.1-570 and § 10.1-603.7, and they shall be subject to the approval of city council. (d) Within one year of the date of adoption of this chapter the program authority shal I assure that the erosion and sediment control program set forth in article II is administered by a certified •