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. . . . . . . ,. . . . . . . . I. I. I . . . . ,. I. . I. . . . . . . . . . . . . I. . . . '. . . I. '. . I. . . . '. . . - CWCB HvdroloQv Worksheet Page 6 Title of Study: County: Calculations By: FIS - Gunnison County, Colorado and Incorporated Areas Gunnison jrs Date: January 14, 2002 Documentation This workbook estimates 100-year discharges for approximate floodplains in Colorado using the following source: Browning, T.W. 1999. Guidelines for Determining l00-year Flood Flows for Approximate Floodplains in Colorado, Version 4.0. Colorado Water Conservation Board. January. River Basin I COL-5: Colorado, Tomichl Creek Subregion Status of Regression Equations for this sub-region: 1...1 Draft Regression Equation Data Q=aAb Where: Q = Discharge (ets) 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 PointlD Drainage Area Description Area (mi") Discharge (cfs) 200 Tomichi Creek - U/S of Hot Springs Creek 276.87 1,310 201HS Hot Springs Creek - at mouth 57.67 Outside Bounds 20nc Tomichi Creek - U/S of Razor Creek 334.54 1,436 203RC Razor Creek - at mouth 68.28 Outside Bounds 203TC Tomichi Creek - U/S of Wood Gulch 402.82 1,572 205WG Wood Gulch - at mouth 18.11 Outside Bounds 205TC Tomichi Creek - U/S of Houston Gulch 420.93 1,606 207HG Houston Gulch - at mouth 14.70 Outside Bounds 211 Quartz Creek - U/S of Alder Gulch 118.06 865 212 Alder Gulch - at mouth 18.51 Outside Bounds 20TTC Tomichi Creek . U/S of Quartz Creek 435.63 1,634 213 Quartz Creek - at mouth 139.11 937 215TC Tomichi Creek - U/S of Cabin Creek 1005.37 2,455 215CC Cochetopa Creek - at mouth 407.34 1,581 217CC Cabin Creek - at mouth 16.34 Outside Bounds 21TTC Tomichi Creek . U/S of LonQ Gulch 1021.71 2,474 218 Long Gulch - at mouth 26.17 Outside Bounds 219 Tomichi Creek - U/S of Chance Creek 1059.20 2,518 1/1412002 CWCB_Hydrology.xls