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<br />. <br /> <br /> <br />COLORADO STATEWIDE <br />DRAINAGE AND FLOODPLAIN MANAGEMENT CRITERIA MANUAL <br /> <br />3. Identification of previous significant flood events, applicable floodplain <br />studies, and FEMA Flood Insurance Studies with analysis of the <br />applicability of data to the subject area. <br /> <br />4. Hydrologic analysis. <br /> <br />5. A description of the method of hydraulic analysis and its application in <br />the study. The hydraulic calculations for each frequency flood shall be <br />summarized in a frequency-elevation table or, in lieu of the table, may <br />be shown on the graph of water surface profiles. The table shall <br />include, at a minimum, the stream station for each cross section, <br />cross section identification, peak discharges, and water surface <br />elevations. <br /> <br />6. Identification and discussion of all input parameters and basis for <br />input parameters. <br /> <br />. <br /> <br />7. Discussion of the analysis results, comparison with existing studies, <br />and conclusions of the hydrologic and hydraulic analysis. This shall <br />include a narrative summary of the results as well as comprehensive <br />output data. <br /> <br />8. The delineation of the floodplain and f100dway boundaries and water <br />surface profiles. Include cross section locations. <br /> <br />9. If appropriate, an analysis of sediment transport and fluvial <br />morphology. <br /> <br />2.11.2 FLOODPLAIN DELINEATION MAP <br /> <br />Floodplain delineation maps should be included in the report. The floodplain <br />delineation maps should show the floodplain information including the <br />f1oodplainlfloodway boundaries, the location of all cross sections used in the <br />hydraulic analysis, a reference line drawn down the center of the low flow <br />channel, and a sufficient number of flood contours in order to reconstruct the <br />flood water surface profiles to an accuracy of :1:0.5 foot. Flood contours shall <br />be shown as wavy lines drawn normal to the direction of flow of floodwater <br />and shall extend completely across the area of the 100-year floodplain. Each <br />flood contour shall indicate its elevation to the nearest whole foot. An <br />example floodplain delineation map is shown on Figure CH4-F201. <br /> <br />The floodplain delineation map scale for detailed studies should be 1-inch <br />equals 400 feet or such map scale as showing sufficient detail. <br /> <br />CHAPTER 4 <br />FLOODPLAIN <br />ADMINISTRATION <br />AND <br />..ELlNEATION <br /> <br />WlECTlON 2.0 <br />FLOODPLAIN <br />DELINEATION <br /> <br />AUGUST 2002 <br /> <br />FLOODPLAIN DELINEATION <br /> <br />CH4-216 <br />