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<br />SPRINGFIELD 156 MI. r
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<br />(HIGBEE
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<br />The purpose of the flood. prone area map~ is to shO\". to administrators, planner,;.;, and
<br />gineers concerned with future land developments those areas that are subject to flooding.
<br />he U.S. Geological Survey \vas requested by the 89th Congress to prepare these maps as
<br />xpressed in House Document 465. The flood-prone areas have been delineated hy tI}p'
<br />E'ological Survey on the basis of readily available information.
<br />Flood.prone area maps were f:::ueated .or thllse areas that meet the foHowing criteria.:
<br />) Urban areas wbcr(~ the upstream drainage area exceeds 25 square miles, (2) rural area.<;
<br />, humid regions wht'. e the upstream drainag'€ area exc('eds 100 square miles, and (;l) rural
<br />reas in semiarid regions where the upstream drainage nrea exceeds 250 square miles.
<br />The flood-prone arc~s shown on this map have a 1 in 100 chance on the average of Iwing'
<br />Hlndated during any year. Flood areas have been delineatpu without cllll,.ideration of
<br />resent or future flood-colltrol storage that may reduct> flood lev~.ls.
<br />F10(..J-ilazard reports pro\'ide the detailE'd flood infurwation that i:" needed (OJ' CC(lllOlIlic
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