12-12-2022 City Council Packet - Laserfiche WebLink

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elevation. The CRITICAL DURATION FLOOD EVENT is generally either the 100-year, 24 hour rainfall event as found in NOAA Atlas 14 or the ten-day snow melt event assumed to be 7.2 inches of runoff occurring on frozen ground (CN=100); however, other durations (e.g., 6-hour) may result in the maximum 100-year return period water surface elevation. DETENTION BASIN. Any natural or man-made depression that stores stormwater runoff temporarily. DEVELOPMENT. Any land -disturbing activity resulting in creation or reconstruction of impervious surface including, but not limited to, municipal road construction. Normal farming practices part of an ongoing farming operation shall not be considered a DEVELOPMENT. DRAINAGE SYSTEM. A system of open channel, pipe or tile, to drain property, including laterals, improvements, and improvements of outlets, which may or may not be a public system under the jurisdiction of a watershed district under M.S. Chs. 10313, 103D, or 103E. EMERGENCY OVERFLOW (EOF). A primary overflow to pass flows above the design capacity around the principal outlet safely downstream without causing flooding. EXCAVATION. The displacement or removal of soil, sediment or other material. FILTRATION. A stormwater quality BMP that uses either natural media such as soil or vegetation or manufactured media to trap pollutants such as nutrients and particles in surface water. IffAll Ell I E W&A"M.. _ r FLOODPLAIN. The beds proper and areas adjoining a wateFbedy wetland, lake or watercourse that are have been or hereafter may be covered by the during the regional flood. FLOODWA-Y FRINGE. That portion of the floodplain outside of the floodway. Flood fringe is synonymous with the term FLOODWAY FRINGE used in the Flood Insurance study for Anoka County,Th, he -area -beam the fleerl,e a y and the be undaryyTtheTo0 mod. 2