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<br />UNITED STATES
<br />DEPARTMENT OF THE INTERIOR
<br />GEOLOGICAL SURVEY
<br />
<br />MAP OF FLOOD-P,RONE..,A,REAS
<br />
<br />CASTOR GULCH QUADRANGLE
<br />COLORADO-MOFFAT CO,
<br />7,5 MINUTE SERIES (TOPOGRAPHIC)
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<br />EXPLANATION
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<br />Approximate boundaries of fJood~prone areas are shown on this map. There is, on the average, .
<br />about 1 chance in 100 that the designated areas will be inundated in any year, This information is
<br />important to public agencies and private citizens concerned with future land developments.
<br />The flood~prone areas have been delineated through use of readily available information on past
<br />floods rather than from detailed field surveys and inspections. In general, the delineated areas are
<br />for natural conditions and do not take into consideration the possible effects of existing or proposed
<br />flood control structures except where those effects could be evaluated. Flood areas have been iden-
<br />tified for: (1) urban areas where the upstream drainage basin exceeds 25 square miles, (2) rural
<br />areas in humid regions where the upstream drainage basin exceeds 100 square miles, (3) rural areas
<br />in semiarid regions where the upstream drainage basin exceeds 250 square miles, and (4) smaller
<br />drainage basins. depending Qn topography and potential use of the flood plains.
<br />The 89th Congress. in House Document 465, recommended the preparation of flood-prone area
<br />maps to assist in minimizing flood losses by quickly identifying the areas of potential flood hazards.
<br />More detailed flood information may be required for other purposes such as structural designs, eco-
<br />nomic studies, or formulation of land-use regulations, Such detailed information may be obtained
<br />from the U.S. Geological Survey, other Federal agencies, or State,local. and private agencies.
<br />
<br />I
<br />1
<br />
<br />SCALE L24000
<br />o
<br />
<br />J MILE
<br />
<br />CONTOUR INTERVAL 40 F[ET
<br />DOTTED liNES REPRESENT 20.FOOT CONTOURS
<br />NATIONAL GEODETIC VERTICAL DATUM OF 1929
<br />
<br />B
<br />
<br />Flood boundaries were estimated from:
<br />Regional st&ge.frequency relations.
<br />
<br />'"
<br />
<br />5
<br />
<br />KllOMETRE
<br />
<br />.......... 0---< t---f 0---< ..........
<br />
<br />PREPARED BY THE U. S. GEOLOGICAL SURVEY
<br />
<br />QU"DR"NGLE lOCA.TIQN
<br />
<br />-N402<',5-WI0730/7,5
<br />Base by U.S. Geological Sur,,'ey
<br />1966
<br />
<br />
<br />A$
<br />
<br />CASTOR GULCH, COLO.
<br />
<br />,
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<br />1978,
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