FLOOD09431

• County: Statewide
• Community: State of Colorado
• Stream Name: All
• Basin: Statewide
• Title: Hydrologic Summary FlS State of Colorado
• Date: 4/1/1981
• Prepared For: FEMA
• Prepared By: Camp Dresser & McKee
• Floodplain - Doc Type: Educational/Technical/Reference Information

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used to compute the lOa-year flow were applied. The SOO-year flow was

extrapolated based upon the resulting frequency-discharge curve of the 10-,

50- and lOa-year flow rates. Peak discharges have been presented in

Table 1.

No existing hydrologic information was found for Forked Gulch, Sand Creek
or Southeast Canon Drainage, therefore COM developed these flows using the
Soil Conservation Service method. This method was applied in order to
achieve a consistency of methodology for the Arkansas River tributaries in
Canon City. The resulting peak flow rates were submitted to FEMA and CWCB
in the form of a letter (March 16, 1981). The individual stream basins
were delineated and the methods as outlined in Reference 9 were applied.
Peak flow rates for Forked Gulch, Sand Creek and Southeast Canon Drainage
have also been presented in Table 1. /

Town of Del Norte, Colorado

The stream studied in Del Norte, Colorado was the Rio Grande River. The
literature search revealed no existing flood flow information for use,in
the flood insurance study for Del Norte, and therefore CDM developed new
hydrologic data. A stream gage station analysis as outlined in
Reference 15 was applied to the USGS gage station at Del Norte. The
resulting frequency-discharge curve is shown in Figure 3. These peak flow
rates were recommended for use in the flood insurance study in Del Norte,
(reference CDM's letter to FEMA, May 14, 1980, Appendix A). The peak flow
rates have been summarized in Table 1.

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