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<br />. <br />. <br />. <br />. <br />'. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />I. <br />'I. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />'. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />Title of Study: <br />County: <br />Calculations By: <br /> <br />USGS HvdroloQv Worksheet <br /> <br />Page 1 <br /> <br />FIRM - Montezuma County Unincorporated Areas <br />Montezuma <br />jag Date: <br /> <br />November 7, 2000 <br /> <br />Documentation <br />This workbook estimates 100-year discharges for approximate floodplains in Colorado using the following <br />source: <br />Vaill, J.E. 2000. Analysis of the Magnitude and Frequency of Floods in Colorado. U.S. <br />Geological Survey Water Resources Investigations Report 99-4190. Denver, Colorado. <br /> <br />11n100 <br />uSGs_Hydrology.xls <br /> <br />[~ <br /> <br />Retum Interval <br />Iloo-year <br /> <br />G <br /> <br />River Basin <br /> <br />I Southwest <br /> <br />Regression Equation Data <br />Q=aA.X' <br /> <br />Where: <br />Q = <br />A = <br />x= <br /> <br />a = <br />b = <br />c = <br /> <br />Discharge (cis) <br />Drainage Area (square miles) <br />1 <br /> <br />coefficient = <br />eoefficient = <br />coefficient = <br /> <br />118.400 <br />0.715 <br />1 <br /> <br />Limited by: <br />Minimum Drainage Area = <br />Maximum Drainage Area = <br /> <br />5.5 square miles <br />988 square miles <br /> <br />Discharge Calculations <br /> <br />Discharge Drainage Not 100-year <br />Point 10 Discharge Point Description Area (mi') Required Discharge (cis) <br />SJ1 Yellow Jacket Canyon, North Trib. - at entrance to Canyo 10.49 636 <br />SJ2 Yellow Jacket Canyon - at entrance to Canyon, dls Iim~ c 9.89 609 <br />SJ3 Yellow Jacket Canyon - immediately U/S of confluence wi 32.49 1,426 <br />SJ4 Brumley Draw. at mouth 8.79 560 <br />SJ5 Dawson Draw - immediately U/S of confluence with Bruml 3.89 Outside Bounds <br />SJ6 Dawson Draw - at entrance to Canyon, dls lim~ of floodpl 19.14 9n <br />SJ7 Dawson Draw - at mouth 21.93 1 ,on <br />SJ8 Sandstone Canyon - at dls lim~ of u/s floodplain designat 33.76 1,466 <br />SJ9 Sandstone Canyon. at mouth 57.51 2,146 <br />SJ10 Yellow Jacket Canyon - immediately u1s of confluence wi 90.64 2,971 <br />SJ11 Negro Canyon - at u/s Iim~ of floodplain designation 11.89 695 <br />SJ12 Negro Canyon - at mouth 18.39 950 <br />SJ13 Yellow Jacket Canyon - immediately u/s of confluence wi 174.42 4,743 <br />SJ14 Hovenweep Canyon - at mouth 39.80 1,649 <br />SJ15 Yellow Jacket Canyon. immediately u1s of confluence wi 196.15 5,159 <br />SJ16 Bridge Canyon - at mouth 10.23 624 <br />