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<br />. <br />. <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 />. <br /> <br />CWCS Hvdroloqv Worksheet <br /> <br />Page 1 <br /> <br />Title of Study: <br />County: <br />Calculations By: <br /> <br />FIS - Ouray County, Colorado <br />Ouray <br />ggs <br /> <br />Date: <br /> <br />May 3, 2001 <br /> <br />Documentation <br />This workbook estimates 1 OO-year discharges for approximate floodplains in Colorado using the following <br />source: <br />Browning, TW. 1999. Guidelines for Determining 100-year Flood Flows for Approximate <br />Floodplains in Colorado, Version 4.0. Colorado Water Conservation Board. January. <br /> <br />River Basin <br /> <br />~ <br />"'1 <br /> <br />eOl - 3: Colorado, Lower Gunnison River Subregion <br /> <br />Status of Regression Equations for this sub-region: Draft <br /> <br />Regression Equation Data <br />Q=aAb <br /> <br />Where: <br />Q = Discharge (cfs) <br />A = Drainage Area (square miles) <br />a = coefficient = <br />b = coefficient = <br /> <br />180.8 <br />0.578 <br /> <br />Limited by: <br />Minimum Drainage Area = <br />Maximum Drainage Area = <br /> <br />2 square miles <br />8000 square miles <br /> <br />Discharge Calculations <br />Drainage <br />Area 10 Drainage Area Description <br />1 PleasantllalleyCre(l~@_G()rlfiu~nce w/_~allasC!eek _______ <br />2 Dallas Creek @ USGS Dallas Cr Nr Ridgway Gage <br />_ .3___ Co",,~~reek @-::-col'1fluei1(;e-wTtJnCClmP<ighre - River_~ <br />4 Uncompagh_re_F1iver @ USGS ColonaGage___ _ <br />5 Dallas Creek @confluence with Uncompahgre River <br />6 Cow C...reek @~l.J~GSCow Creek Gage. <br />7 Pleasant Valley Creek_@ USGS /'oJo,,1 Gage ___ _ <br />8 Uncompaghre River @Colona(excluding_RidgewayResv.) <br /> <br />Drainage <br />Area (mi') <br />31.00 <br />97.20 <br />- ----- --- <br />111.00 <br />448.00 <br />-- --------- ----- <br />104.00 <br />45.40 <br />- "-------- ------- <br />8.17 <br />184.00 <br /> <br />100-year <br />Discharge (cfs) <br />1,316 <br />2,547 <br />2,750 <br />- ~-- --- <br />6,161 <br />2,649 <br />1,641 <br />609 <br />3,684 <br /> <br />5/3101 <br />CWCS_Hydrology.xls <br />