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

. Clear Creek County Hydrology Study
Colorado Water Conservation Board
USGS Regression Equations for the Mountains Region
Obtained from "Analysis of the Magnitudes and Frequency of Floods in Colorado" 1996 (DRAFT)
Clear Creek at Silver Plume
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 44.9 0.423 465
5 Q=17.9(A)^,677*(S+ 1 )^2,739 44.9 0.423 618
10 Q=23.0(A)^.685*(S+ 1 )^2.364 44.9 0.423 717
50 Q=34.5(A)^.700*(S+ 1 )^1.768 44.9 0.423 923
100 Q=39,5(A)^,706*(S+1)^1.577 44.9 0.423 1011
500 Q=51.5(A)^,715*(S+1)^1.209 44.9 0.423 1198
Fall River at Confluence with 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 23.4 0.368 263
. 5 Q=17.9(A)^.677*(S+ 1 )^2.739 23.4 0.368 357
10 Q=23,O(A)^.685*(S+ 1 )^2.364 23.4 0.368 418
50 Q=34.5(A)^,700*(S+ 1 )^1.768 23.4 0,368 546
100 Q=39.5(A)^,706*(S+ 1 )^1.577 23.4 0.368 600
500 Q=51.5(A)^,715*(S+ 1)^1.209 23.4 0.368 717
West Fork Clear Creek at u/s end of Empire
(Approx, 1,000' u/s of Lion Creek confluence with West Fork)
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 41.3 0.424 441
5 Q=17.9(A)^.677*(S+ 1 )^2,739 41,3 0.424 585
10 Q=23.0(A)^.685*(S+ 1 )^2.364 41.3 0.424 679
50 Q=34.5(A)^. 700*(S+ 1 )^1. 768 41.3 0.424 872
100 Q=39.5(A)^.706*(S+ 1 )^1.577 41.3 0.424 954
500 Q=51.5(A)^. 715*(S+ 1 )^1.209 41.3 0.424 1129

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