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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 />i. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />I: <br />. <br />. <br />. <br />. <br />I. <br />. <br />. <br />. <br />. <br />I. <br />'. <br />... <br /> <br />CWCS HvdroloQV Worksheet <br /> <br />Pagel <br /> <br />Title of Study: <br />County: <br />Calculations By: <br /> <br />FIS - Gunnison County, Colorado and Incorporated Areas <br />Gunnison <br />jrs Date: January 14, 2002 <br /> <br />Documentation <br />This workbook estimates 100-year discharges for approximate floodplains in Colorado using the following <br />source: <br />Browning, T,W. 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 />I COL-3, Colorado, lower Gunnison RIver Subregion <br />Status of Regression Equations for this sub-region: <br /> <br />I~ <br /> <br />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 /> <br />Drainage Drainage 100-year <br />Point 10 Drainage Area Description Area (mi") Discharge (cfs) <br />100 Muddy Creek - uls of Lee Creek 89,53 2,429 <br />101 Lee Creek - at mouth 21,92 1,077 <br />102 Muddy Creek - uls of West Muddy Creek 133.98 3,066 <br />103 West Muddy Creek - at mouth 89.98 2,436 <br />104 Muddy Creek - uls of Anthratice Creek 257.57 4,474 <br />105 Anthratice Creek - at mouth 49,37 1,722 <br />110 Crystal Creek - uls of Gunnison County Line 101.60 2,613 <br />400 South Beaver Creek - at mouth 64.78 2,015 <br />401 Beaver Creek - at mouth 28.34 1,249 <br />402 Steuben Creek - at mouth 10.01 685 <br />403 Willow Creek - at mouth 74.33 2,181 <br />410 Middle Fork Powderhom Creek - at mouth 11,71 750 <br />411 West Fork Powderhom Creek - at mouth 45.19 1,636 <br />412 Dry Fork Powderhom Creek - at mouth 3.15 351 <br />414 Cebolla Creek - uls of Beaver Creek 256.76 4,466 <br />415 Beaver Creek - at mouth 15.19 871 <br />416MG Milkranch Gulch - at mouth 6.74 545 <br />416CC Cebolla Creek - uls of Goose Creek 342.08 5,271 I <br /> <br />1/1412002 <br />CWCB_Hydrology,xJs <br />