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

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Of note is that the peak flows under existing conditions
indicate that the road embankment at Bradley Road and the
spi llway on detention pond #5 would be overtopped in a lOO-year
storm. The RBD and SLA hydrology showed that the ponds would
contain the 100-year flows. This has significant impact on the
culverts and channels that were recently constructed since they
were designed to contain the 100-year flows and elIminate
Inundation of new development.

13.0 JIMMY CAMP TRIBUTARY HYDROLOGY

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13.2

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Watershed Description

The watershed for Jimmy Camp TrIbutary (JCT) is located
southeast of Widefield to the north and west of Marksheffel
Road. The headwaters of the drainage are east of BIg Johnson
Reservoir and north of Fontaine Boulevard. This tributary has
been named the FontaIne Tributary in the 1987 Jimmy Camo Creek
!:laster jJralnage Plannil]g Study (Reference 31). The location is
more spE!cificaIly shown on Figure 13.1.

The watershed is currently undeveloped for the most part, with
a small amount of development occurring southeast of
MarksheEfel Road and along Fontaine Boulevard. The watershed
consists primarIly of rolling terrain with rangeland slopes
varyIng from less than 1% to over 4%. There are several small
stock p,'nds in the basIn, but for the most part the channel is
relatively undefined, particularly In the area where it crosses
Marksheffel Road just upstream of the confluence with Jimmy
Camp Creek. Soils In the basin are classified as mostly type
llBl1 and I'C'I with moderate infiltration rates.

PrevIous studies include the FTS. -=- El Paso County (Reference
19), thE! Flood Hazard Analvses -=- PortIons of Jimmy Camo Creek
~Dd TrIhllt~ries by the SCS (Reference 32) and the JImmy Camp
Creek !:!,aster Dralna~ planning, Study by Wilson and Co.
(Reference 31).

This tributary has never been studied for floodplain mapping
purposes and the only detailed analysis was completed as part
of the master drainage planning study.

Previous Studies

A comparison of flows from the previous studies is provided in
Table 13.1. The detai.ls of the 1975 hydrologic analysis are
not available, although the total 100-year discharge at the
lower end of the study on Jimmy Camp Creek immediately
upstream of this tributary was estimated to be 14,500 cfs.

In 1976, the U. S. Army Corps of Engineers studied the lower
portions of the Jimmy Camp Creek watershed (Reference 10) and

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