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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I. . . . . . '. . . . I. I. . . . . . . . . . ... CWCS HvdroloQv Worksheet Page 2 Title of Study: County: Calculations By: FIS - Gunnison County, Colorado and Incorporated Areas Gunnison jrs Date: January 14, 2002 Documentation This workbook estimates 1 OO-year discharges for approximate floodplains in Colorado using the following source: Browning, T.W. 1999. Guidelines for Determining 1oo-year Flood Flows for Approximate Floodplains in Colorado, Version 4.0. Colorado Water Conservation Board. January. River Basin 1 COL-3: Colorado, Lower GIlnnison River Subregion Status of Regression Equations for this sub-region: El Draft Regression Equation Data Q=aAb Where: Q = Discharge (cis) A = Drainage Area (square miles) a = coefficient = b = coefficient = 180.8 0.578 Limited by: Minimum Drainage Area = Maximum Drainage Area = 2 square miles 8000 square miles Discharge Calculations Drainage Drainage 100-year PointlD Drainage Area Description Area (mi") Discharge (cfs) 418 Goose Creek - U/S of Tovlar Peak 9.72 673 419 Cebolla Creek. at mouth 380.48 5,606 420 Lake Fork Gunnison River - U/S of Yeager Gulch 332.70 5,187 421 YeaQer Gulch - at mouth 1.38 Outside Bounds 422 Indian Creek - at mouth 8.07 604 423 Lake Fork Gunnison River - U/S of Indian Creek 341.36 5,265 4261C Indian Creek - U/S of Gunnison River 27.55 1,229 426LF Lake Fork Gunnison River - U/S of Little Willow Creek 393.08 5,712 425 Lake Gulch - uls of T 48 N R 3 W, Section 22 2.76 325 430 Lona Draw - U/S of T 47 N R 4 W, Section 26\ 3.41 367 431 Willow Creek. U/S of Armitaae Springs 13.49 813 432 Willow Creek - U/S of T 48 N R 4 W, Section 35 17.81 955 440 Stream by CR25 - U/S of T 48 N R 4 W, Section 3 5.85 502 450 Pine Creek - U/S of T 47 N R 4 W, Section 20 3.21 355 451 Poison Draw - U/S ofT 47 N R 4 W, Section 17 3.88 396 452 Pine Creek - U/S of Sheep Creek 11.62 746 453 Sheep Creek - at mouth 5.58 488 454 IPine Creek - U/S of T 48 N R 4 W, Section 8 20.18 1,027 1/1412002 CWCB_Hydrology.xls