FLOOD10116

• County: Douglas
• Community: Douglas County
• Stream Name: Dad Clark Gulch
• Basin: South Platte
• Title: FHAD - Dad Clark Gulch
• Date: 2/1/1980
• Prepared For: Douglas County
• Prepared By: UDFCD
• Floodplain - Doc Type: Floodplain Report/Masterplan

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TABLE 2
WATERSHED AND HYDROGRAPH PARAMETERS

13 subareas and about 3,700 cfs using one subarea. The 0100 val ues
calculated for the downstream end of each of the 13 subareas are summar-ized
in Table 2A along with Q100 values calculated for the entire basin
(treated as a single subarea) and 0100 values for three key confluences
of the various reaches of Dad Clark Gulch considered in this analysis.
Typical hydrographs computed at the downstream end of six of the subareas
are shown in Figures 3, 4 and 5 in the Appendix of this report.

TABLE 2A
Length to PEAK FLOW RATES
Sub- Area Length Centroid Slope % Kt C Ct
p
Basin _(Sq. Mi.) ~-l (Mi .) % Imp. CALCULATED
---~~
0100(1)
1000 .526 2.14 .88 2.2 37 .0920 .400 .233 SUB-BASIN (cfs)
2000 .204 .86 .31 4.0 58 .0850 .475 .143
2010 .495 1. 38 .48 3.6 57 .0855 .470 .168 1000 4446
2020 1.052 2.00 .88 4.0 36 .0920 .390 .202 2000 4434
3000 .745 1. 73 .70 3.2 32 .0931 .375 .204 2010 1799
3010 .281 1.40 .57 3.6 25 .0980 .340 .197 2020 1336
3020 .331 .95 .45 4.6 31 .0945 .370 .166 3000 3193
3030 .538 1.21 .57 4.4 22 .1000 .330 .189 3010 1015
4000 .985 1. 99 1. 04 2.7 30 .0950 .370 .233 3020 992
5000 .417 1.14 .47 3.3 41 .0900 .410 .174 3030 720
6000 .335 .87 .34 3.3 39 .0910 .405 .163 4000 2165
6010 .939 2.12 1.14 3.9 19 .1030 .320 .238 5000 1898
6020 .744 1.72 .81 4.6 29 .0950 .365 .196 6000 1735
Entire 6010 777
Basin 7.592 6.55 3.08 2.4 31 .0945 .370 .327 6020 941
Ent ire
Basin 3736
-----
(1) Additional calculated 0100 valves are as follows:
Confl uence of Sub-Basins 2010 & 3000, 0100 ~ 4700 cfs
Confl uence of Sub-Basins 3010 & 4000, 0100 ~ 3118 cfs
Confl uence of Sub-Basins 6010 & 6020, 0100 ~ 1632 cfs

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