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<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 />I. <br />. <br />. <br />. <br />:. <br />I. <br />. <br />. <br />. <br />I. <br />I. <br />. <br />I. <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 3 <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 />11nJOO <br />uSGS_Hydrology.xls <br /> <br />G <br /> <br />Return Interval <br />liDO-year <br /> <br />El <br /> <br />River Basin <br /> <br />1_ <br /> <br />Regression Equation Data <br />Q=aAbX< <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 />coefficient = <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 1 OO-year <br />Point 10 Discharge Point Description Area (mi') Required Discharge (cis) <br />SJ33 Hartman Draw Tributary. at mouth 7.51 501 <br />SJ34 Hartman Draw . immediately u/s of confluence with Hart 24.99 1,182 <br />SJ35 Hartman Canyon - at mouth 34.12 1,4n <br />SJ36 Alkali Canyon Tributary (northwest) - at mouth 4.88 Outside Bounds <br />SJ37 Alkali Canyon Tributary (southwest) . at mouth 2.96 Outside Bounds <br />SJ38 Alkali Canyon Tributary - at mouth 7.87 517 <br />SJ39 Alkali Canyon - immediately uls of confluence with Alkali 5.93 423 <br />SJ40 Alkali Canyon - immediately uls of confluence with Narra 15.39 836 <br />SJ41 Narraguinnep Canyon . at mouth 21.55 1,064 <br />SJ42 Alkali Canyon. at mouth 47.19 1,863 <br />SJ43 Mud Creek. at mouth 35.01 1,505 <br />SJ44 Mc Elmo Creek - immediately uls of confluence with Alka 151.02 4,279 <br />SJ45 Mc Elmo Creek - immediately uls of confluence with Mud 228.86 5,760 <br />SJ46 Trail Canyon. at mouth 12.80 733 <br />SJ47 Mc Elmo Creek - at mouth (ColoradolUtah state line) 346.37 7,747 <br />SJ48 Rincon Canyon - at Colorado/Utah state line 13.69 769 <br />