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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. I. I. I. . I. . . . . . I. . . . . . . . . Title of Study: County: Calculations By: USGS HvdroloQv Worksheet Page 4 FIRM - Montezuma County Unincorporated Areas Montezuma jag Date: November 7, 2000 Documentation This workbook estimates 1 OO-year discharges for approximate floodplains in Colorado using the following source: Vaill, J.E. 2000. Analysis of the Magnitude and Frequency of Floods in Colorado. U.S. Geological Survey Water Resources Investigations Report 99-4190. Denver, Colorado. 1 117100 USGS_Hydrology.xls G Return Interval liDO-year G River Basin I Southwest Regression Equation Data Q=aA'X' Where: Q= A = x= a = b = c = Discharge (cis) Drainage Area (square miles) 1 coefficient = coefficient = coefficient = 118.400 0.715 1 Limited by: Minimum Drainage Area = Maximum Drainage Area = 5.5 square miles 988 square miles Discharge Drainage Not 1CO-year Point 10 Discharge Point Description Area (mi') Required Discharge (cis) SJ49 East Me Elmo Creek. at Colorado/Utah state line 22.07 1,082 SJ50 Middle Mancos River. at mouth 12.45 718 SJ51 East Mancos River - immediately us! of confluence with ~ 11.99 699 SJ52 East Mancos River. at mouth 28.13 1,287 SJ53 West Mancos River - at mouth 42.86 1,739 SJ54 Chicken Creek - at mouth 25.78 1,209 SJ55 Mancos River - immediately U/S of confluence with Chick 80.11 2,719 SJ56 East Fork Mud Creek. at mouth 21.41 1,059 SJ57 West Fork Mud Creek. at mouth 6.12 432 SJ58 Mud Creek (Mancos) - at mouth 38.09 1,598 SJ59 Mancos River - immediately U/S of confluence with Mud ( 116.62 3,557 SJ60 East Canyon. at mouth 20.22 1,016 SJ61 Weber Canyon. immediately u/s of confluence with East 10.94 655 SJ62 Weber Canyon - at mouth 34.71 1,495 SJ63 Mancos River - immediately U/S of confluence with Webe 168.54 4,629 Discharge Calculations