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Last modified
1/25/2010 6:24:08 PM
Creation date
10/4/2006 10:48:58 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
258
County
Pueblo
Community
Pueblo
Basin
Arkansas
Title
Flood Insurance Study - Pueblo
Date
9/1/1986
Designation Date
9/1/1986
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br />boundaries for Dry Creek (East) downstream of 4th Street. In all other <br />aspects, the Flood Hazard Boundary Map is in agreement with this study. <br /> <br />In March 1979, a basin study titled Wild Horse-Dry Creek Flood Hazard <br />Study (Reference 34), was conducted by KLH Engineering Consultants, Inc. <br />The KLH study did not calculate existing flood discharges; therefore, a <br />comparison with this study is not justifiable. The KLH study did calculate <br />future discharges for proposed full-basin development. For the lOa-year <br />flood, the future peak discharges were from 23 to 29 percent more than <br />existing conditions. Because it is not anticipated that such hydrology <br />conditions will exist until after the year 2000, the KLH study offers no <br />findings that conflict with discharges determined by the COE for this <br />study. <br /> <br />The Lake Minnequa basin was studied in a 1975 report by Sellards and <br />Grigg, Inc., titled Lake Minnequa Master Storm Drainage and Financing <br />Plan (Reference 13). That report was based on a detailed rainfall-runoff <br />analysis of the basin. Review of the study showed that the existing <br />(1975) lOa-year discharge to Lake Minnequa was estimated to be 1,800 cfs <br />and that the future full-development (date unknown) discharge was calcu- <br />lated to be 4,100 cfs. Because little technical information was presented <br />in the study, a detailed and complete review was not possible. However, <br />Sellards and Grigg, Inc., used a 100 percent pervious value for undevel- <br />oped areas, whereas the study contractor recommended a value closer to <br />95 percent. The 100 percent pervious value for undeveloped areas would <br />produce a runoff discharge lower than that determined by the study con- <br />tractor. Additionally, the only inflow hydrograph presented in the report <br />was for the fully developed condition, complete with proposed local de- <br />tention facilities. <br /> <br />The City of Pueblo determined a lOa-year peak discharge for University <br />Park Tributary (Reference 35) for the purpose of sizing the culverts at <br />Jerry Murphy Road. The city used the Rational Method to determine this <br />peak discharge for a subbasin of the stream. However, that methodology <br />could not be applied to the entire drainage basin because the size of <br />the total basin exceeded 1,000 acres. The methodology used for this <br />study resulted in a higher lOa-year peak discharge at Jerry Murphy Road <br />than that calculated by the city. <br /> <br />This study is authoritative for the purposes of the NFIP; data presented <br />herein either supersede or are compatible with all previous determinations. <br /> <br />7. 0 LOCATION OF DATA <br /> <br />Information concerning the pertinent data used in the preparation of <br />this study can be obtained by contacting the Natural and Technological <br />Hazards Division, FEMA, Denver Federal Center, Building 710, Box 25267, <br />Denver, Colorado 80225-0267. <br /> <br />33 <br />
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