FLOOD08485

• 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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TABLE IV
DRAINAGE BASIN PARAMETERS FOR SWMM

KENNEYS RUN

Kenneys Run: The hydrologic analysis for the Kenneys Run drainage basin
involved dividing the basin into 48 sub-basins and utilizing the E.P.A.'s Storm
Water Management Model (SWMM) with modifications developed by the Missouri River
Division, Corps of Engineers. SWMM was calibrated from a hydrologic analysis
based on CUHP, completed as part of this study. The results were checked for
reasonableness and the condition of the existing drainage system was incorporated
into the final watershed routing. Figure 1 shows the basin and sub-basin
boundaries. Figure 4 shows the discharge-probabil ity profiles. Figure 5 shows
typical 100-year flood hydrographs.

Basin

(ft)
Width

1 2500
2 2700
3* 1100
4 5400
5 1600
6 4000
7 6100
8 2000
9 1200
10 3050
11 4350
12 1680
13 1800
14 5300
15 3000
16 1100
17 1200
18 1200
19 2200
20 3600
21 700
22 2700
23 1500
24 2200
25 2000
26 2600
27 5500
28 2550
29 1560
30 1030
31 4500
32 1400
33 2530
34 4000
35 1000
36 1740
37 1300
38 3200
39 1900
40 1900
41 1800
42 1000
43 800
44 2200
45 1570
46 2200
47 2400
48 1870

Total Number of Subcatchments:

The basin parameters are tabulated in Table IV. Rainfall data and design
storms were determined as outlined for the Tucker Gulch analysis without the
application of areal rainfall reductions. Infiltration losses for the SWMM model
were also based on Horton's Equation as described for Tucker Gulch.

Detailed documentation of the hydrologic analysis is available at the offices
of the Urban Drainage and Flood Control District.

Hydraulic Analysis

A hydraulic analysis was completed along the channel of the studied streams
to determine water surface elevations for the 10- and 100-year runoff events.
This hydraulic analysis was completed using the HEC-2 Water Surface Profile
Computer Program developed by the Army Corps of Engineers (Reference 11).

Cross section data was obtained photogrammetrica11y by digitizing sections of
the stream and floodplain. These sections were taken from the same photography
flown for the topographic mapping used in this study (~eference 3). The digit-
ized sections were supplemented with cross sections taken from this mapping
as needed. All bridge and culvert data was obtained from actual field measure-
ments.

(ac)
Area

140
152
30
100
34
230
140
40
63
50
80
65
50
122
15
20
40
33
110
100
20
50
50
30
93
30
165
88
56
71
207
90
78
320
28
48
46
110
57
52
54
61
30
51
18
41
22
15

48

(ft/ft) (Existing)
Slope Ia

.30
.09
.10
.30
.16
.11
.30
.19
.10
.11
.30
.20
.09
.30
.30
.09
.30
.30
.30
.11
.30
.11
.10
.25
.07
.25
.04
.05
.03
.06
.09
.13
.04
.05
.07
.18
.14
.14
.07
.14
.10
.04
.25
.10
.08
.08
.07
]8

(Future)
Ia

2%
13%
10%
3%
2%
10%
2%
2%
2%
10%
2%
2%
2%
3%
2%
2%
2%
2%
2%
16%
2%
25%
2%
2%
22%
2%
10%
11%
40%
30%
2%
2%
40%
10%
28%

2%
37%
10%
3%
30%
10%
2%
28%
23%
10%
2%
40%
32%
3%
40%
40%
2%
40%
2%
40%
2%
40%
40%
40%
60%
70%
37%
52%
40%
30%
6%
2%
60%
52%
45%
16%
27%
4%
48%
2%
48%
75%
2%
70%
65%
60%
40%
80%

8%

27%
2%
48%
2%
48%
63%
2%
70%
65%
26%
5%
70"L

Total tributary area (acres): 3595

*Area is tributary to Golden Reservoir and was excluded from the SWMM model.

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