FLOOD04641

• County: Denver
• Community: All
• Stream Name: All
• Basin: South Platte
• Title: Proposed Hydrology for use in Hydraulic Analysis of FEMA Flood Studies and Restudies
• Date: 9/1/1989
• Prepared For: State of Colorado
• Prepared By: Resource Consultants
• Floodplain - Doc Type: Educational/Technical/Reference Information

r.

without adjustment. A summary of the basin parameters is
presented In Table 5.2.

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IABLE 5.2 SUMMARY OF FC BASIN PARAMETERS
DRAINAGE AREA CURVE NUMBER TIME OF
SUBBASIN muare mileu CN CONCENTRATION. Ie
1 2.357 75 0.76
2 1. 234 76 0.88
3 0.960 81 0.55
4 0.750 79 0.47

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The stage-discharge curve for the morning glory spillway at
Curr Reservoir was available in the LOMRFC (originally obtained
from the State Engineer's OffIce). It was incorporated in the
TR-20 model to accurately represent storage detention routing
through the structure. The conservative assumption that the
reservo:Lr stage was at the crest of the spillway at the begin-
ning of each storm event was included.

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The peak discharge resul ts for the 24-hour AMC II storm for the
points :lndIcated on Figure 5.1 are presented in Table 5.3. the
2,910 cfs value for the 100-year flood at Interstate 25 seems
reasonable when compared to the results of the previous two
studies.

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TABLE 2....l. -=- SUMMARY OF FC DISCHARGES BY RCI

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R€~OURC€ CON~UlTI\NT~ INC

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DRAINAGE AREA PEAK DISCHARGE(l) (cfs)
LOCATION (square mIles) 10 YR 50 YR 100 YR 500 YR
FC 1 3.59 650 1,100 1,400 NA (2)
FC 2 4.55 1,100 1,740 2,180 NA(2)
FC 2a 4.78 1,210 1,910 2,390 3,400
FC 2b 5.04 1,330 2,110 2,640 3,800
FC 3 5.30 1,470 2,320 2,910 4,150

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(1) These values result from the 24-hour AMC II storm.
(2) The 500..year discharge was not determined for poInts outside the
study rE!ach.

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6.0 TEMPLETON GAP HYDROLOGY

6.1

Watershed Description

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The Templeton Gap Drainage Basin (TG) is located in the north
central portion of Colorado Springs as shown in Fig 6.1. The
basin borders on the northern edge of the Sand Creek West Fork
and on the western border of Sand Creek MaIn Stem. The basin
consists of two channels that form a "wishbone" and carry
runoff in a general westward direction.

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