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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 />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br /> <br />CWCB Hvdroloav Worksheet <br /> <br />Page 1 <br /> <br />Title of Study: <br />County: <br />Calculations By: <br /> <br />FIS - Pitkin County, Colorado and Incorporated Areas <br />Pitkin <br />GGS Date: May 11, 2001 <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 />COL-!: Colorado, Upper Colorado River Subregion <br />Status of Regression Equations for this sub-region: <br /> <br />... <br /> <br />Draft <br /> <br />Regression Equation Data <br />Q=aAb <br /> <br />Where: <br />Q = Discharge (ets) <br />A = Drainage Area (square miles) <br />a = coefficient = <br />b = coefficient = <br /> <br />79.5 <br />0.724 <br /> <br />Limited by: <br />Minimum Drainage Area = <br />Maximum Drainage Area = <br /> <br />1 square miles <br />950 square miles <br /> <br />Discharge Calculations <br /> <br />Drainage Drainage 100-year <br />ArealD Drainage Area Description Area (mi") Discharge (ets) <br />1 Brush Cr @ Snowmass Village east corp. boundary 14.50 551 <br />2 Castle Cr @USGS Gaging Station No. 09074800 32.20 982 <br />3 Hunter Cr @ USGS Gaging Station No. 09073700 6.18 297 <br />4 Hunter Cr @ USGS Gaging Station No. 09074000 41.10 1,172 <br />5 Ivanhoe Cr @ USGS Gaging Station No. 09077600 9.12 394 <br />6 NF Fryingpan R. @ USGS Gaging Station No. 09078500 42.00 1,190 <br />7 Owl Cr @ USGS Gaging Station NO. 09076520 6.60 312 <br /> <br />5/11/01 <br />CWCB_Hydrology.xls <br />