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FLOOD03877
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Last modified
1/25/2010 6:44:36 PM
Creation date
10/5/2006 12:09:06 AM
Metadata
Fields
Template:
Floodplain Documents
County
Fremont
Community
Florence
Basin
Arkansas
Title
FIS - Florence
Date
3/17/2002
Prepared For
Fremont County
Prepared By
FEMA
Floodplain - Doc Type
Historic FEMA Regulatory Floodplain Information
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<br />For the Arkansas River, peak dishcarges were obtained from <br />Reference 3, wherein peak dishcarges for the 10-, 50-, 100-, <br />and SOO-year recurrence materials were estimated using gage <br />data from the U.S. Geological Survey (USGS) gage stations <br />located on the Arkansas River at Canon City and Pueblo, <br />Colorado (USGS gage stations 70960 and 70995, respectively). <br />A Log-Pearson Type-II fit was utilized as outlined in <br />Reference 5 at each station. The results for each frequency <br />were then plotted with repect to drainage area (3,117 square <br />miles at the Canon City gage, and 4,666 square miles at the <br />Pueblo gage), and peak discharges for the Arkansas River at <br />Colorado Highway 115 determined (drainage area 3,546 square <br />miles) by an area proportion. A summary of drainage area-peak <br />discharge relationships for each stream studied in detail is <br />shown in Table 1. <br /> <br />TABLE 1 - SUMMARY OF DISCHARGES <br /> <br />Flooding Source <br />and Location <br /> <br />Drainage Area <br />(square miles) <br /> <br />(cubic feet <br />10-YEAR 50-YEAR <br /> <br />Peak Discharge <br />per second) <br />lOa-YEAR SOO-YEAR <br /> <br />Oak Creek <br />At Mouth <br /> <br />72.0 <br /> <br />7,100 <br /> <br />13,300 <br /> <br />16,000 <br /> <br />23,000 <br /> <br />Coal Creek <br />At Confluence With <br />Arkansas River <br /> <br />18.1 <br /> <br />3,400 <br /> <br />6,200 <br /> <br />7,400 <br /> <br />8,200 <br /> <br />Coal Creek East Overflow <br />At Confluence With <br />Arkansas River <br /> <br />N/A <br /> <br />N/A <br /> <br />N/A <br /> <br />2,350 <br /> <br />N/A <br /> <br />Coal Creek West Overflow <br />At Confluence With <br />Arkansas River <br /> <br />N/A <br /> <br />N/A <br /> <br />N/A <br /> <br />2,OSO <br /> <br />N/A <br /> <br />Arkansas River <br />At Florence <br />(Colo 115, 6, 974.95 <br />Arkansas River Mile) <br /> <br />3,546 <br /> <br />11,000 <br /> <br />21,000 <br /> <br />28,000 <br /> <br />71,000 <br /> <br />Peak discharges for the Coal Creek East and West Overflows on <br />Coal Creek below the Denver and Rio Grande Western Railroad <br />were determined based upon the hydraulic analysis of Coal <br />Creek (as described in Section 3.2, below). <br /> <br />3.2 Hydraulic Analyses <br /> <br />Analyses of the hydraulic characteristics of the flooding <br />sources studied in detail for this community were carried out <br />to provide estimates of the elevations of floods of the <br /> <br />-6- <br />
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