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I. . . . . . . . . . . . . . . I: . . . . . . . . . . . . . . . . . . . . I. . . . . . . . . . . . . I. . . . CWCS HvdroloQV Worksheet Page 7 Title of Study: County: Calculations By: FIS - Gunnison County, Colorado and Incorporated Areas Gunnison jrs Date: January 14,2002 Documentation This workbook estimates loo-year discharges for approximate floodplains in Colorado using the following source: Browning, TW. 1999. Guidelines for Determining 100-year Flood Flows for Approximate Floodplains in Colorado, Version 4.0. Colorado Water Conservation Board. January. River Basin I eOL-S: Colorado, Tomichi Creek SUbregion Status of Regression Equations for this sub-region: I~ Draft Regression Equation Data Q=aAb Where: Q = Discharge (cis) A = Drainage Area (square miles) a = coefficient = b = coefficient = 84.7 0.487 Limited by: Minimum Drainage Area = Maximum Drainage Area = 100 square miles 1070 square miles Discharge Calculations Drainage Drainage 100-year Point 10 Drainage Area Description Area (mi") Discharge (cis) 220 Chance Creek - at mouth 18.50 Outside Bounds 221 Tomichi Creek - U/S of the Town of Gunnison 1093.20 Outside Bounds 222 Stubbs Gulch - at mouth 23.94 Outside Bounds 223 Gold Basin Creek - U/S of Stubbs Gulch 12.54 Outside Bounds 224 Gold Basin Creek - at mouth 41.78 Outside Bounds 1/1412002 CWCB_Hydrology.x1s