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<br />SEDALlA QUADRANGLE
<br />COLORADO - DOUGLAS CO.
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<br />UNITED STATES
<br />DEPARTMENT OF THE INTERIOR
<br />GEOLOGICAL SURVEY
<br />
<br />MAP OF
<br />
<br />FLOOD-PRONE AREAS
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<br />10'5'00'
<br />39'30"
<br />"12OO'mN. 28
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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 infonna-
<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 areas in humid regions where the
<br />upstream drainage basin exceeds 100 square miles, (3) rural areas in semiarid r~gions 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 />(lood 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 />or State, local, and private agencies.
<br />
<br />1973
<br />
<br />!
<br />.
<br />
<br />1 MilE
<br />--'
<br />
<br />EXPLANATION
<br />
<br />6CXXl 1000 fUT
<br />~ . ==::::::J
<br />I KILOMETER
<br />-::=:=
<br />
<br />;000
<br />
<br />Flood boundaries were estimated from:
<br />Regional stage-frequency relations.
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<br />El
<br />
<br />SEDALlA. COLO.
<br />NW/4 CASTLE ROCK QUADRANGLE
<br />N3922 5 W10452 5/7 "
<br />Base by U.S. Geological Survey
<br />1965
<br />
<br />CONTour, IN\ERVAL 20' r,El
<br />DAfUM IS MI AN SEA LEvn
<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 />QUADRANGLE LOCATION
<br />
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