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FLOOD08485
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Last modified
1/25/2010 7:14:42 PM
Creation date
10/5/2006 3:41:05 AM
Metadata
Fields
Template:
Floodplain Documents
County
Jefferson
Community
Golden
Stream Name
Tucker Gulch, Kenneys Run
Basin
South Platte
Title
Flood Hazard Area Delineation
Date
1/1/1983
Prepared For
Jefferson County / Arapahoe County
Prepared By
UDFCD
Contract/PO #
&&
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Location <br /> <br />Tucker Gulch Mouth <br /> <br />Tucker Gulch u/s of <br />Cressmans Gulch <br /> <br />Tucker Gulch u/s of <br />Highway 93 <br /> <br />Cressmans Gulch Mouth <br /> <br />Cressmans Gulch u/s <br />of Hi ghway 93 <br /> <br />Kenneys Run Mouth <br /> <br />West Fork Kenneys <br />Run u/s 20th St. <br /> <br />West Fork Kenneys <br />Run u/s Trib. No.1 <br /> <br />West Fork Kenneys <br />Run u/s Hwy. 6 <br /> <br />West Fork Kenneys <br />Run u/s Deadman Gulch <br /> <br />West Fork Kenneys <br />Run u/s Trib. No.2 <br /> <br />Tri b. No. 1 <br /> <br />North Fork Trib. No.1 <br /> <br />South Fork Trib. No.1 <br /> <br />Deadman Gulch <br /> <br />Trib. No.2 <br /> <br />East Fork Kenneys <br />Run Mouth <br /> <br />East Fork Kenney s <br />Run u/s Jackson St. <br /> <br />Eas t Fork Kenney s <br />Run u/s Boys School Rd. <br /> <br />Johnson Road Tributary <br />to East Fork Kenneys Run <br /> <br />TABLE I <br />SUMMARY OF DISCHARGES <br /> <br />TUCKER GULCH <br /> <br />Drainage <br />Area 10-yr. <br /> <br />11. 43 820 <br /> <br />9.62 640 <br /> <br />9.51 640 <br />1.48 23D <br /> <br />1.16 150 <br /> <br />KENNEY S RUN <br />5.62 1620 <br /> <br />3.43 770 <br /> <br />1. 50 560 <br /> <br />1. 30 400 <br /> <br />0.88 270 <br /> <br />0.33 110 <br />1.00 170 <br />0.26 50 <br />0.64 110 <br />O. 30 90 <br />O. 36 90 <br /> <br />1. 78 720 <br /> <br />1. 44 720 <br /> <br />0.50 430 <br /> <br />0.76 <br /> <br />Discharge <br />50-yr. <br /> <br />1900 <br /> <br />1600 <br /> <br />1580 <br />510 <br /> <br />360 <br /> <br />3300 <br /> <br />1610 <br /> <br />1070 <br /> <br />840 <br /> <br />570 <br /> <br />190 <br />460 <br />140 <br />290 <br />200 <br />240 <br /> <br />1230 <br /> <br />1200 <br /> <br />730 <br /> <br />100-yr. <br /> <br /> TABLE I I <br /> DRAINAGE BASIN PARAMETERS FOR CUHP* <br /> TUCKER GULCH <br /> (mi2) (mil (mi) (ft/ft) (Existing) (Future) <br />Basin Area L Lea Slope ~5.i.. ~ ~~~ <br />T-17 9.02 7.16 3.75 .06** 2% .55 .47 no change <br />T-89 0.60 1.53 0.68 .055 10% .26 .27 23% .22 .31 <br />C-12 1.16 2.97 1.46 .06** 3% .38 .34 4% .37 .33 <br />C-3 0.32 1.14 0.44 .050 4% .25 .27 20% .19 .27 <br />T-10 0.33 1.23 0.57 .039 20% .20 .27 24% .20 .30 <br /> <br />2800 <br /> <br />2300 <br /> <br />2300 <br />710 <br /> <br />490 <br /> <br />*CUHP - Colorado Urban Hydrograph Procedure <br />**Maximum slope of .06 was assumed for steep basins for use with CUHP. <br />la - percent impervious area <br /> <br />4020 <br /> <br />2010 <br /> <br />CUHP Equations <br /> in which, <br />Ct = K (LL )0.18 Kt = time coefficient related to I <br /> t ca a <br /> S 0.24 L = hydraulic length of basin in (miles) <br /> 0 <br /> Lca = centroidal length of basin in (miles) <br />Cp = P K AO.15 So average stream slope in (ft/ft) <br /> t = <br /> C (LL )0.3 Ct = unit hydrograph coefficient reflecting <br />tp = <br /> t ca time to peak <br /> P = peaking coefficient related to la <br />qp = 640 C drainage area of basin in (mi.2) <br /> p A = <br /> tp Cp = unit hydrograph coefficient reflecting <br /> peak di scharge <br />Tp = t + 0.5 t tp = time to peak of unit hydrograph from <br /> p u midpoint of unit rainfall in (hours) <br /> qp = unit peak of unit hydrograph in (cfs/mi.2) <br />Qp = qp A <br /> tu = time of unit rainfall duration in (hours) <br /> Tp = time to peak of unit hydrograph in (hours) <br /> Qp = peak discharge of unit hydrograph in (cfs) <br /> 9 <br /> <br />1370 <br /> <br />1100 <br /> <br />740 <br /> <br />250 <br />620 <br />190 <br />390 <br />260 <br />330 <br /> <br />1500 <br /> <br />1400 <br /> <br />850 <br /> <br />530 <br />
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