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<br />UNITED STATES
<br />DEPARTMENT OF THE INTERIOR
<br />GEOLOGICAL SURVEY
<br />
<br />MAP OF FLOOD-PRONE AREAS
<br />
<br />FRISCO QUADRANGLE
<br />COLORADO-SUMMIT CO.
<br />7,5 MINUT.E SERIES (TOPOGRAPHIC)
<br />SE/4 DILLON l~' aU"DRANOLE
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<br />
<br />EXPLANATION
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<br />. Approximate boundaries of flood-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 'on topography and potential use of the flood plains.
<br />The 89th Congress, in House Document 46.-5, 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 />M.ore 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 />1978
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<br />Flood boundaries were estimated from:
<br />Regional stage-frequency relations.
<br />
<br />6000 7000 FEEl
<br />,
<br />
<br />4000
<br />--
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<br />5000
<br />
<br />1000 0 1000 2000 3000
<br />E:::::t.---.t=t.t:-:::L..-.--- ..l....-
<br />I 5 0
<br />F=-~'-==--~ ~'J'=.<E'
<br />
<br />_1 KllOMET[R
<br />
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<br />
<br />EJ
<br />
<br />SE/4 DILLON 15' QUADRANGLE
<br />
<br />CONTOUR INTERVAL 40 fEET
<br />DATUM IS MEAN SEA L[VEl
<br />
<br />FRISCO. COLO.
<br />
<br />QU,I,OR,I,NGlE LOCATION
<br />
<br />PREPARED BY THE U.S. GEOLOGICAL SURVEY
<br />
<br />N3930-W1060017.5
<br />Base by U.S. Geological Survey
<br />1970
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