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<br />Flood hazard exhibits for the Cottonwood Creek study area are in the <br /> <br />The Flood Hazard Area Map Index is useful in locating the various flood <br /> <br /> <br />hazard exhibits in respect to the study area. The locations of flood <br /> <br /> <br />hazard area maps and study reaches are illustrated on the Flood Hazard <br /> <br /> <br />Area Map Index. <br /> <br />Flood Hazard Exhibits <br /> <br />Appendix following the text of this report. Included in the Appendix <br /> <br />are: Flood hazard area map index, flood hazard area maps, flood profiles, <br /> <br /> <br />typical valley cross-sections, and tabulations for the flood frequency- <br /> <br /> <br />elevation and discharge data_ For use in determining the flood hazard <br /> <br /> <br />for any particular location, the flood profiles and tabular material are <br /> <br />Flood Profiles <br /> <br />Maps <br /> <br />In addition to the 100- and 500-year frequency floods, hydraul ic studies <br />were made on the 10- and 50-year events. Information regarding these <br />smaller floods is . 11 f <br />especla y use ul for engineering design purposes <br />related to roads, storm h <br />sewers, c annels, and appurtenant structures. <br />Flood profiles for the various frequency floods are included in this <br /> <br />assembled by reach numbers in sequential order, 1 through 5. The <br /> <br /> <br />following are descriptions and suggested uses of the exhibits. <br /> <br />report as Exhibit A. <br /> <br />For information regarding flood elevations at <br /> <br />For planning and flood zone regulation purposes, the 100-year flood is <br /> <br />a specific location th fl d f'l <br />, e 00 pro I e data can be used in conjunction <br />with the flood hazard area maps. Th <br />e cross-section locations which <br /> <br />appear on both the profiles and maps can be used as reference points. <br /> <br />Flood hazard area sheet numbers, compat-,ble w'tth <br />cross~section loca- <br /> <br />used locally as the base flood. Larger floods, such as the 500-year <br /> <br /> <br />flood are also considered in the planning and management of flood-prone <br /> <br /> <br />areas. The 100-year and 500-year events are outlined on the Flood <br /> <br />Hazard Area Maps. In many instances the outerlimits of the 100- and <br /> <br />tions, are shown on each flood profile exhibit. <br /> <br />500-year floods will appear as one line on the maps. This is due to <br /> <br />the topographic relief and slight difference in elevation between the <br /> <br />As a general guide for orientation purposes, h f 11 . <br />t e 0 owing designations <br /> <br />two flood events. It should be noted that areas shown as flooded on the <br /> <br />are assigned to stream reaches, flood hazard <br />area maps, and cross- <br /> <br />sections. <br /> <br />maps may vary more or less with present field conditions. For detailed <br /> <br />information, flood elevations should be determined at specific locations <br /> <br /> <br />and checked with field surveys. Maps, drawings, and other technical <br /> <br />Reach <br />Number <br /> <br />2 <br /> <br />Flood Hazard Area Cross-Sections <br />Map-Sheet Numbers Designations <br />1, 2, 3, & 4 A thru Z, AA thru AK <br />3, 4, 5, & 6 AK, BA thru BP <br />5, 6, 7, & 8 BP, CA thru CZ, DA thru DO <br /> <br />data labeled Existing Conditions are vali~ as of November 1975. )j <br /> <br />3 <br /> <br />1/ Date of aerial photography for photogrammetric mapping. <br /> <br />11 <br /> <br />12 <br />