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CONVEYANCE SYSTEM . Open channel , pipe or tile that is not a Public Drainage <br /> System . A portion of a conveyance system is defined as " regional " if it carries flows from <br /> a drainage area of greater than 200 acres . <br /> CRITICAL DURATION FLOOD EVENT. The 100 - year precipitation or snow melt <br /> event with a duration resulting in the maximum 100 - year return period water surface <br /> elevation . The CRITICAL DURATION FLOOD EVENT is generally either the 100 - year , <br /> 24 hour rainfall event as found in NOAA Atlas 14 or the ten - day snow melt event <br /> assumed to be 7 . 2 inches of runoff occurring on frozen ground ( CN = 100 ) ; however , <br /> other durations ( e . g . , 6 - hour) may result in the maximum 100 - year return period water <br /> surface elevation . <br /> DETENTION BASIN . Any natural or man - made depression that stores stormwater <br /> runoff temporarily . <br /> DEVELOPMENT. Any land - disturbing activity resulting in creation or reconstruction <br /> of impervious surface including , but not limited to , municipal road construction . Normal <br /> farming practices part of an ongoing farming operation shall not be considered a <br /> DEVELOPMENT. <br /> DRAINAGE SYSTEM. A system of open channel , pipe or tile , to drain property , <br /> including laterals , improvements , and improvements of outlets , which may or may not <br /> be a public system under the jurisdiction of a watershed district under M . S . Chs . 10313 , <br /> 103D , or 103E . <br /> EMERGENCY OVERFLOW (EOF) . A primary overflow to pass flows above the <br /> design capacity around the principal outlet safely downstream without causing flooding . <br /> RR (1CIC) NI 0 hin CMIhWnIT C (1ICITR (1I D1 A hl A nnhpnnf PA 16000 h/1I_ nr oryi i � i � tont <br /> LI 11 %00 W-b-a t <br /> > or <br /> > <br /> r► nvor , ancd nnnQf n in� inn nh � � inrr <br /> EXCAVATION. The displacement or removal of soil , sediment or other material . <br /> FILTRATION. A stormwater quality BMP that uses either natural media such as soil <br /> or vegetation or manufactured media to trap pollutants such as nutrients and particles in <br /> surface water . <br /> nf 0 <br /> on ♦ Anil fni 'W or ornsivo nn Ant rli :L s n <br /> FLOODPLAIN. The beds proper and areas adjoining a .,,bedy-wetland , lake or <br /> watercourse tht nro i a nu� ndntedwhich have been or hereafter may be covered by the <br /> d1ir " no thin <br /> re ional flood . <br /> 6 <br />