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"Storm sewer or drain " means a sewer which carries Stormwater, surface runoff, street
<br />wash water and drainage, but which excludes sanitary sewage.
<br />"Stormwater runoff' means that part of precipitation that travels over natural altered or
<br />impervious surfaces to the nearest stream, channel, conduit or impoundment and appears in
<br />surface waters.
<br />"Stormwater system " means all manmade facilities, structures and natural water courses
<br />used for collecting and conveying sormwater to ,through and from drainage areas to the points
<br />of final outlet, including but not limited to, the following: streets, curbs and gutters, inlets,
<br />conduits and appurtenant fetures, canals, creeks, channels, catchbasins, ditches, drains, sewers,
<br />streams, gulches, gullies, flumes, culverts, siphons, retention or retention basins, dams,
<br />floodwalls, levees, pumping stations and wetlands.
<br />"Subdivision" means the same as defined in section 33.1-22 of the City of Portsmouth's
<br />Subdivision Ordinance.
<br />"Total maximum daily load " or "TMDL " means the sum of the individual wasteload
<br />allocations for point sources, load allocations for nonpoint sources, natural background loading,
<br />and a margin of safety. TMDLs can be expressed in terms of either mass per time, toxicity, or
<br />other appropriate measure. The TMDL process provides for point source versus nonpoint source
<br />trade-offs.
<br />"Undeveloped property" means any parcel which has not been altered from its natural
<br />state to disturb or alter the topography or soils on the property in a manner which substantially
<br />reduces the rate of infiltration of Sormwater into the earth.
<br />"Virginia Stormwater Management Act" or "Act" means Article 2.3 (§62.1-44.15:24 et
<br />seq.) of Chapter 3.1 of Title 62.1 of the Code of Virginia.
<br />"Virginia Stormwater BMP Clearinghouse website " means a website that contains
<br />detailed design standards and specifications for control measures that may be used in Virginia to
<br />comply with the requirements of the Virginia Stormwater Management Act and associated
<br />regulations.
<br />"Virginia Stormwater Management Program " or "VSMP " means a program approved
<br />by the State Board after September 13, 2011, that has been established by a locality to manage
<br />the quality and quantity of runoff resulting from land-disturbing activities and shall include such
<br />items as local ordinances, rules, permit requirements, annual standards and specifications,
<br />policies, and guidelines, technical materials, and requirements for plan review, inspection,
<br />enforcement, where authorized in this article, and evaluation consistent with the requirements of
<br />this article and associated regulations.
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