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<br />." <br /> <br />'- <br /> <br />.j~~ <br />..,0 \ <br />OJ> <br />. <br /> <br />UNITED STATES <br />DEPARTMENT OF THE INTERIOR <br />GEOLOGICAL SURVEY <br /> <br />un <br /> <br />4171 <br /> <br />4269 <br /> <br />The purpose of the flood-prone area maps is to show to administrators, planners, and <br />engineers concerned with future land developments those areas that are subject to flooding. <br />The U.S. Geological Survey was requested by the 89th Congress to prepare these maps as <br />expressed in House Document 465. The flood.prone areas have been delineated by the <br />Geological Survey on the basis of readily available information. <br />Flood. prone area maps were delineated for those areas that meet the following criteria: <br />(1) Urban areas where the upstream drainage area exceeds 25 square miles, (2) rural areas <br />in humid regions where the upstream drainage area exceeds 100 square miles, and (3) rural <br />areas in semiarid regions where the upstream drainage area 'exceeds 250 square miles. <br />The flOod-prone areas shown on this map have a 1 in 100 chance on the average of being <br />inundated during any year. Flood areas have been delineated without consideration of <br />present or future flood-control storage that may reduce flood levels. <br />Flood-hazard reports provide the detailed flood information that is needed for economic <br />studies, for formulating zoning regulations, and for setting design criteria to minimize <br />future flood losses. When detailed infonnation, such as that contained in the flood-hazard <br />reports, is required, contact the U.S. Army, Corps of Engineers; the U.S. Geological Survey; <br />or the Tennessee Valley Authority in the areas of their jurisdiction. <br /> <br />MAP OF FLOOD-PRONE AREAS <br /> <br />7823 <br /> <br /> SCALE 1:24000 <br /> 1 0 <br /> , <br />1000 0 1000 2000 3000 4000 <br />~ ~ ~ <br /> 1 .5 0 <br /> ~ ~ ~ ~ ~ <br /> <br />1 MILE <br /> <br />5CJO <br /> <br />6000 70CXJ FEET <br />, <br /> <br />1 KILOMETER <br /> <br />CONTOUR INTERVAL 20 FEET <br />DATUM IS MEAN SEA LEVEL <br /> <br />1970 <br /> <br />7251 <br /> <br />GUNNISON QUADRANGLE <br />COLORADO-GUNNISON CO. <br />7.5 MINUTE SERIES (TOPOGRAPHIC) <br /> <br />35' <br /> <br />- <br /> <br />EXPLANATION <br /> <br />Flood boundaries were estimated from: <br />Regional stage-frequency relations. <br /> <br />B <br /> <br />GUNNISON, COLO. <br /> <br />QUADRANGLE LOCATION <br /> <br />Base by U.S. Geological Survey <br /> <br />1954 <br />