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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 />. <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 2 <br /> <br />FIRM - Montezuma County Unincorporated Areas <br />Montezuma <br />jag Date: <br /> <br />November 7, 2000 <br /> <br />Documentation <br />This workbook estimates 1 OO-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 />11/7100 <br />usGS_Hydmlogy.xls <br /> <br />G <br /> <br />Retum Interval <br />liDO-year <br /> <br />G <br /> <br />River Basin <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 (cfs) <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 100-year <br />Point 10 Discharge Point Description Area (mi") Required Discharge (cis) <br />SJ17 Yellow Jacket Canyon. immediately uls of confluence wi 238.01 5,924 <br />SJ18 Yellow Jacket Canyon. at Colorado/Utah state line 248.74 6,114 <br />SJ19 StinkinoSprinas. at mouth 6.72 462 <br />SJ20 Kernan Canyon. at mouth 11.04 659 <br />SJ21 Simon Draw - immediately uls of confluence with Kernan 25.81 1,210 <br />SJ22 Ritter Draw - at mouth 51.33 1,978 <br />SJ23 Simon Draw - at mouth 6.85 469 <br />SJ24 Mc Elmo Creek. immediatelY uls of confluence with Sim 42.52 1,729 <br />SJ25 Mc Elmo Tributary (Armory) . at mouth 0.65 Outside Bounds <br />SJ26 Mc Elmo Tributary (Denny Lake) - at mouth 0.82 Outside Bounds <br />SJ27 Mc Elmo Tributary (Cortez) - at mouth 0.68 Outside Bounds <br />SJ28 Mc Elmo Creek - immediately uls of confluence with Mcl 92.14 3,006 <br />SJ29 Mc Elmo Tributary (Long Spur) . at mouth 8.59 551 <br />SJ30 Mc Elmo Tributary (Krueger Point) - at mouth 2.60 Outside Bounds <br />SJ31 Hartman Draw Tributary (northeast) . at mouth 1.88 Outside Bounds <br />SJ32 Hartman Draw Tributary (northwest) - at mouth 1.93 Outside Bounds <br />