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Last modified
11/23/2009 1:02:50 PM
Creation date
10/4/2006 10:10:26 PM
Metadata
Fields
Template:
Floodplain Documents
Designation Number
52
County
El Paso
Community
El Paso County Unincorporated
Title
Flood Hazard Analysis - Portions of Jimmy Camp Creek and Tributaries, El Paso County, Colorado
Date
10/1/1975
Designation Date
3/1/1976
Prepared By
US SCS, Denver
Floodplain - Doc Type
Floodplain Report/Masterplan
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<br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />11 <br /> <br />12 <br /> <br />Hydrologic analyses were conducted using runoff computation~ based <br /> <br /> <br />on existing land use and cover conditions in the watershed as of May <br /> <br /> <br />1973. Information regarding the type and location of existing and <br /> <br /> <br />projected land uses were provided by the El Paso County Planning Depart- <br /> <br /> <br />ment. Comparison studies of present and future runoff showed insignifi- <br /> <br /> <br />cant differences resulting from projected changes in land use. land <br /> <br /> <br />treatment will not significantly affect the peak flow estimates for <br /> <br /> <br />future flooding; however, a continuing land treatment program is necessary <br /> <br />to curtail sediment and erosion damages. All technical data in thi s <br /> <br />report are based on existing conditions. <br /> <br />INTERPRETATION AND USE OF REPORT DATA <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />There are no streamflow records for Jimmy Camp Creek. Synthetic <br /> <br /> <br />rainfall-runoff evaluation procedures were used in determining the flows <br /> <br /> <br />for various frequency storms. These procedures are described in the SCS <br /> <br /> <br />National Engineering Handbook, Section 4. <br /> <br />Flood lines for the 100- and SOO-year floods were located on the <br />aerial mosaics using the water surface elevations, cross-section data. <br /> <br /> <br />and by interpolating between the cross-sections. Recognizing that <br /> <br /> <br />aerial photographs are subject to displacement due to ground relief, the <br /> <br /> <br />photographic image does not match the del ineated flood 1 ines in all <br /> <br /> <br />areas. The location of flood lines at road crossings were computed <br /> <br /> <br />using the normal openings of bridges and culverts. Because of the' <br /> <br /> <br />multitude of possible events In which sediw~nt and debris could cause <br /> <br /> <br />blockage of bridges and culverts, these considerations were not included <br /> <br /> <br />in the study. In some locations, flooding occurs as shallow overland <br /> <br /> <br />flow in transit from perched channels to the main channel. At these <br /> <br /> <br />locations, the water surface elevations may not be level across the <br /> <br /> <br />flood plain as in the normal situation. <br /> <br />Technical Studies <br /> <br />Maps <br /> <br />The 10-, 25-, 50-. 100- and SOO-year frequency flood events were <br />analyzed and water surface profiles plotted showing elevations,at each <br />cross-section. Water surface profile determinations were made using the <br />U.S. Army Corps of , Engineers computer program HEC-2. The flood events <br />have an average occurrence of once In the number of years as indicated. <br /> <br />For example, the lOa-year flood occurs once in 100 years on the average. <br /> <br />and has a one percent chance of being equaled or exceeded in any given <br /> <br />year. <br /> <br />
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