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<br />UNITED STATES
<br />DEPARTMENT OF THE INTERIOR
<br />GEOLOGICAL SURVEY
<br />
<br />'- 13 "'" TO INTf:RSTATE :15 .5063/ SW
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<br />MAP OF FLOOD-PRONE AREAS
<br />
<br />COAL CREEK QUADRANGLE
<br />COLORADO
<br />7,5 MINUTE SERIES (TOPOGRAPHIC)
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<br />Approximate boundaries of flood-prone areas are shown on this map. There is, on the
<br />average, about 1 chance in 100 that the designated areas will be inundated in any year.
<br />This information is important to public agencies and private citizens concerned with future
<br />land developments.
<br />The flood-prone areas have been delineated through use of readily available informa-
<br />tion on past floods rather than from detailed field surveys and inspections. In general.
<br />the delineated areas are for natural conditions and do not take into consideration the pos-
<br />sible effects of existing or proposed flood control structures except where those effects
<br />could be evaluated. Flood areas have been identified for: (1) urban areas where the up-
<br />stream drainage basin exceeds 25 square miles, (2) rural areM in humid regions where the
<br />upstream drainage basin exceeds 100 square miles, (3) rural areas in semiarid regions where
<br />the upstream drainage basin exceeds 250 square miles, and (4) smaller drainage basins,
<br />depending on topography and potential use of the flood plains.
<br />The 89th Congress, in House Document 465, recommended the preparation of flood-prone
<br />area maps to assist in minimizing flood losses by quickly identifying the areas of potential
<br />flood hazards. More detailed flood information may be required for other purposes such
<br />as structural designs, economic studies, or formulation of land-use regulations. Such de-
<br />tailed information may be obtained from the U.S. Geological Survey, other Federal agencies,
<br />o~StatE7, lo~~~! and pri~te~2'~n~i~t.- .,...,.... _ _ ___ __ _ _
<br />
<br />SCALE 124000
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<br />EXPLANATION
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<br />woo
<br />
<br />2000 3000
<br />
<br />4000
<br />
<br />5000
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<br />6000
<br />
<br />'000 0
<br />............. .........
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<br />Flood boundaries were estimated from:
<br />Regional stage-frequency relations.
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<br />I KllOMETEf?
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<br />CONTOUR INTERVAL 10 FEET
<br />DATUM 1$ MEAN SEA LEVEL
<br />Prepared by the U,S. Department of the Interior,
<br />Geological Survey, in cooperation with the
<br />U.S. Department of Housing and Urban Development.
<br />Federal Insurance Administration.
<br />
<br />COAL CREEK, COLO.
<br />N 393 7, 5-Wl 043 7 ,5( 7.5
<br />Base by U.S. Geological Survey
<br />1966
<br />
<br />QUADRANGLE LOCATION
<br />
<br />1973
<br />
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