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<br />. <br />. <br />. <br />I. <br />i. <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 />. <br />. <br />. <br />I. <br />,. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />USGS HvdroloQv Worksheet <br /> <br />Page 1 <br /> <br />Title of Study: <br />County: <br />Calculations By: <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 />River Basin <br /> <br />I Southwest <br /> <br />Return Interval <br />!l00-year <br /> <br />G <br /> <br />[~ <br /> <br />Regression Equation Data <br />Q=aA.Xc <br /> <br />Where: <br />Q= <br />A = <br />X= <br /> <br />Discharge (cis) <br />Drainage Area (square miles) <br />1 <br /> <br />coefficient = <br />coefficient = <br />coefficient = <br /> <br />118.400 <br />0.715 <br />1 <br /> <br />a = <br />b = <br />c = <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 (mi2) Required Discharge (cis) <br />SJ1 Yellow Jacket Canyon, North Trib. - at entrance to Canyo 16.66 885 <br />SJ2 Yellow Jacket Canyon - at entrance to Canyon, d1s limit c 18.46 952 <br />SJ3 Yellow Jacket Canyon - immediately u/s of confluence wi 54.09 2,054 <br />SJ4 Brumley Draw - at mouth 17.66 922 <br />SJ5 Dawson Draw - immediately u/s of confluence with Bruml 9.50 592 <br />SJ6 Dawson Draw - at entrance to Canyon, d1s limit of floodpl 41.46 1,698 <br />SJ7 Dawson Draw - at mouth 48.84 1,909 <br />SJ8 Sandstone Canyon - at d1s limit of u/s floodplain designat 28.80 1,309 <br />SJ9 Sandstone Canyon - at mouth 59.60 2,201 <br />SJ10 Yellow Jacket Canyon - immediately u/s of confluence wi 136.07 3,972 <br />SJ11 Negro Canyon - at u/s limit of floodplain designation 22.58 1,100 <br />SJ12 Nearo Canyon - at mouth 38.24 1,603 <br />SJ13 Yellow Jacket Canyon - immediately u/s of confluence wi 219.85 5,597 <br />SJ14 Hovenweep Canyon - at mouth 46.70 1,849 <br />SJ15 Yellow Jacket Canyon - immediately u/s of confluence wi 268.44 6,456 <br />SJ16 Bridge Canyon. at mouth 17.49 916 <br /> <br />11moo <br />uSGs_Hydrology.xls <br /> <br />- <br />