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FLOOD02319
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FLOOD02319
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Last modified
1/25/2010 6:24:06 PM
Creation date
10/4/2006 10:48:27 PM
Metadata
Fields
Template:
Floodplain Documents
County
El Paso
Community
El Paso County
Stream Name
Arkansas River
Basin
Arkansas
Title
Unincorporated El Paso County Community File
Date
1/1/2001
Prepared For
CWCB
Prepared By
CWCB
Floodplain - Doc Type
Community File
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<br />Dr. John <br />February <br />Page 2 <br /> <br />Liou. <br />24, 'lI!I!l1 <br /> <br />. CAMP DRESSER & McKEE INC. <br /> <br />for use in the current FIS for Colorado Springs and EI Paso County, have <br />been developed from the review of existing hydrologic information prepared <br />by the Army Corps of Engineers In previous studies. The two studies <br />reviewed were the 1971 Flood Plain Information Report of Monument Cree~ in <br />Colorado Springs and the 1976 Report on Hydrologic Investigations for Flood <br />Insurance Studies of Colorado Springs and EI Paso County. The peak <br />discharge for the 100-year event compare wel I between the two reports even <br />though different hydrologic 8ethods were used. The 1971 study employed a <br />regional stream gage analysis to predict the Intermediate Regional Flood. <br />The 1976 report assu~ed that the area tributary to Monument Creek above <br />9,000 feet should not be included in the effective drainage area used in <br />the TM-1 regression equations. The reason for this assumption is that the <br />area above 9,000 feet wi I I only contribute to peak flood discharges during <br />a snowmelt or a highly locdllzed storm event over the high elevations. The <br />peaks resulting from these types of hydrologic events wil I be attenuated at <br />the lower points in the basin such as at the southern AFA boundary (total <br />drainage area approximately 167 square miles). Further, a regional gage <br />station analysis of tributaries to the Arkansas River above Pueblo carried <br />out by CDM in the FIS of Canon City and Florence, Colorado showed that <br />major flood events in this basin wi II result from very heavy rainfalls over <br />large areas. We feel that the assumption made by the Army Corp of <br />Engineers in their 1976 Hydrologic Investigation is a reasonable one for <br />this location on Monument Creek. The peak discharges recommended for use <br />in the current FIS are summarized at several points for Lower Monument <br />Creek in Table 2. <br /> <br />The peak flow rates summarized in Tables 1 and 2 are intended to supplement <br />the Hydrologic Review previously submitted to FEMA by CDM. The peak flows <br />shown wil I be used for the hydraulic analysis of Monument Creek. Please <br />contact us as soon as possible if you have any questions or concerns about <br />the hydrologic results thus far. <br /> <br />Very truly yours, <br /> <br />CAMP DRESSER & McKEE INC. <br /> <br />Richard N. Wray <br />Proj ect Manager <br /> <br />RNW/ps <br />cc: Gene Jencsok, CWCB <br /> <br />
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