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stormwater conveyance system" which means a pipe, ditch, vegetated swale, or other stormwater conveyance system constructed by man except for restored stormwater conveyance systems; (2) "Natural stormwater conveyance system" which means the main channel of a natural stream and the flood -prone area adjacent to the main channel; or (3) "Restored stormwater conveyance system" which means a stormwater conveyance system that has been designed and constructed using natural channel design concepts; restored stormwater conveyance systems include the main channel and the flood -prone area adjacent to the main channel. Stormwater detention means the process of temporarily impounding runoff and discharging it through a hydraulic outlet structure to a downstream conveyance system. Stormwater management facility means a control measure that controls stormwater runoff and changes the characteristics of that runoff including the quantity and quality, the period of release or the velocity of flow. Stormwater Pollution Prevention Plan or SWPPP means a document that is prepared in accordance with good engineering practices and that identifies potential sources of pollutants that may reasonably be expected to affect the quality of stormwater discharges. A SWPPP required under the VESMP for construction activities shall identify and require the implementation of control measures and shall include or incorporate by reference an approved erosion and sediment control plan, an approved stormwater management plan, and a pollution prevention plan. Stormwater runoff means runoff. Subdivision means the division of property into two or more lots. Surface waters means (1) all waters that are currently used, were used in the past, or may be susceptible to use in interstate or foreign commerce, including all waters that are subject to the ebb and flow of the tide; (2) all interstate waters including interstate wetlands; (3) all other waters such as interstate lakes, rivers, streams (including intermittent streams), mudflats, sandflats, wetlands, sloughs, prairie potholes, wet meadows, playa lakes, or natural ponds the use, degradation, or destruction of which would affect or could affect interstate or foreign commerce including any such waters (a) that are or could be used by interstate or foreign travelers for recreational or other purposes (b) from which fish or shellfish are or could be taken and sold in interstate or foreign commerce or (c) that are used or could be used for industrial purposes by industries in interstate commerce; (4) all impoundments otherwise defined as surface waters under this definition; (5) tributaries of waters identified in subdivisions (1) through (4) under this definition; (6) the territorial sea; and (7) wetlands adjacent to waters (other than waters that are themselves wetlands) identified in subdivisions (1) through (6) of this definition. Waste treatment systems, including treatment ponds or lagoons designed to meet the requirements of the CWA and the law, are not surface waters. Surface waters do not include prior converted cropland. Notwithstanding the determination of an area's status as prior converted cropland by any other agency, for purposes of the CWA, the final authority regarding CWA jurisdiction remains with the EPA. SWM means stormwater management. SWPPP means a Stormwater Pollution Prevention Plan. Temporary vehicularstream crossing means a temporary nonerodible structural span installed across a flowing watercourse for use by construction traffic. Structures may include bridges, round pipes or arches constructed on or through nonerodible material. Ten-year storm means a storm that is capable of producing rainfall expected to be equaled or exceeded on the average of once in 10 years. It may also be expressed as an exceedance probability with a 10% chance of being equaled or exceeded in any given year. Total maximum daily load or "TMDL" means the sum of the individual wasteload allocations for point sources, load allocations (LAs) for nonpoint sources, natural background loading, and a margin of safety. TMDLs can be expressed in terms of either mass per time, toxicity, or other appropriate measure. The TMDL process provides for point versus nonpoint source trade-offs. Page 9 of 27