FLOOD00672

• County: Clear Creek
• Title: Hydrologic Analysis Clear Creek
• Date: 2/1/1998
• Prepared For: Clear Creek County
• Prepared By: CWCB
• Floodplain - Doc Type: Floodplain Report/Masterplan

. West Fork Clear Creek at d/s end of Empire
(Approx. 600' d/s of Bard Creek confluence with West Fork)
Recurrence Mean
Interval Regression D.A. Slope Peak Flow
(years) Equation (sq. mi.) (ft/ft ) (cfs)
2 Q=11,O(A)^.663*(S+ 1 )^3.465 55.3 0.413 521
5 Q=17.9(A)^.677*(S+ 1 )^2.739 55.3 0.413 698
10 Q=23.0(A)^.685*(S+ 1 )^2.364 55.3 0.413 814
50 Q=34,5(A)^,700*(S+1)^1,768 55,3 0.413 1055
100 Q=39.5(A)^.706*(S+ 1 )^1.577 55.3 0.413 1158
500 Q=51,5(A)^.715*(S+1 )^1.209 55,3 0.413 1378
Clear Creek just upstream of the confluence with South Clear Creek
Recurrence Mean
Interval Regression D.A. Slope Peak Flow
(years) Equation (sq. mi.) (ft/ft) (cfs)
2 Q=11.0(A)^.663*(S+ 1 )^3.465 47.9 0.425 488
5 Q=17.9(A)^.677*(S+ 1 )^2.739 47.9 0.425 648
10 Q=23.0(A)^.685*(S+ 1 )^2.364 47.9 0.425 752
50 Q=34,5(A)^,700*(S+ 1 )^1,768 47.9 0.425 968
. 100 Q=39.5(A)^.706*(S+ 1 )^1.577 47,9 0.425 1060
500 Q=51.5(A)^,715*(S+1)^1,209 47.9 0.425 1257
Clear Creek just downstream of the confluence with South Clear Creek
Recurrence Mean
Interval Regression D.A. Slope Peak Flow
(years) Equation (sq. mi.) (ftIft) (cfs)
2 Q=11.0(A)^.663*(S+ 1 )^3,465 78.6 0.385 614
5 Q=17.9(A)^.677*(S+ 1 )^2.739 78.6 0.385 838
10 Q=23.0(A)^.685*(S+ 1 )^2.364 78,6 0.385 987
50 Q=34.5(A)^.700*(S+1 )^1.768 78.6 0,385 1302
100 Q=39.5(A)^.706*(S+ 1 )^1.577 78.6 0,385 1438
500 Q=51.5(A)^.715*(S+ 1)^1.209 78.6 0.385 1730

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