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<br />I <br />, I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />CWCS HvdroloQV Worksheet <br /> <br />Pagel <br /> <br />Title of Study: <br />County: <br />Calculations By: <br /> <br />FIS - Boulder County and Incorporated Areas <br />Boulder <br />jag Date: <br /> <br />December 4, 2000 <br /> <br />Documentation <br />This workbook estimates 1 OO-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 />rsPi.::i; &,~th Platte, Northern Foothills Subregion <br /> <br />~ <br /> <br />Status of Regression Equations for this sub-region: <br /> <br />Accepted <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 />800.8 <br />0.478 <br /> <br />Limited by: <br />Minimum Drainage Area = <br />Maximum Drainage Area = <br /> <br />1 square miles <br />445 square miles <br /> <br />Discharge Calculations <br /> <br />Discharge Drainage 100-year <br /> PointlD Discharge Point Description Area (mi2) Discharge (cfs) <br /> S1 North SI. Vrain Creek - at Apple Valley Road 117.68 7,822 <br /> S2 North 51. Vrain Creek - at west Lyons corporate limits 121.60 7,946 <br />---~ <br /> .. ... <br /> .- -.. <br />-'- <br /> - -~-_.- - .-'- -- <br />--.~ u____ _____ - <br />----- --. -- <br />-._- -'- <br />-'--. -- <br />----- . <br />----.- - . --- ---.--.- <br />-'- - --- <br />------ --- <br />-- ------ . ___n'___ .. <br />-------- --- .. ----- - <br /> <br />12/4/00 <br />CWCB_Hydrology.xls <br />