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<br />. <br /> <br /> <br />COLORADO STATEWIDE <br />DRAINAGE AND FLOODPLAIN MANAGEMENT CRITERIA MANUAL <br /> <br />5. <br /> <br />Characteristics of the proposed channel including slope, <br />roughness, depth, velocity, Froude Number, centerline <br />alignment and stationing, and cross sections. Existing <br />topographic maps may be utilized if they are field verified to <br />detennine if changes have occurred. The plan and profile <br />shall be provided for the existing channel and the proposed <br />channel including the cross section locations. <br /> <br />6. A description of the method of hydraulic analysis and its <br />application in the study. <br /> <br />7. Identification and discussion of all input parameters and the <br />basis for the input parameters. <br /> <br />8. Discussions of the results and conclusions for the hydrologic <br />and hydraulic analyses. This shall include a narrative <br />summary of the results as well as comprehensive output file <br />printouts, free of modeling errors. <br /> <br />9. Delineation of the existing and proposed project conditions <br />100-year floodplains, water surface profiles, and cross- <br />section locations. <br /> <br />. <br /> <br />10. <br /> <br />A description of potential impacts, if any, on other property <br />owners along the floodplain. <br /> <br />11. A conceptual design of the proposed drainage system <br />including embankment protections, drop structures, culverts, <br />bridges, and hardened trickle or low flow channel. <br /> <br />12. If appropriate, an analysis of sediment transport and fluvial <br />morphology. <br /> <br />1.14.3 SMALL ENCROACHMENT AREA EXEMPTION <br /> <br />If the floodplain encroachment resulting from the proposed activity is small, <br />the applicant may claim exemption from the requirement of a Floodplain <br />Modification Study provided that the applicant can demonstrate the following: <br /> <br />CHAPTER 4 <br />FLOODPLAIN <br />ADMINISTRATION <br />AND <br />DELINEATION <br /> <br />~ECTION 1.0 <br />LOODPLAIN <br />NAGEMENT <br /> <br />The proposed floodplain modifications do not remove more than 5% of the <br />100-year flow conveyance area for a given cross section, and the area <br />removed by the proposed activity will be compensated by additional grading <br />so that there is no net loss of effective flow conveyance area for the 100-year <br />flow. <br /> <br />To claim an exemption, the applicant must submit the following information to <br />the Floodplain Administrator: <br /> <br />. A topographic map showing the location of the proposed project site <br />with the currently accepted floodplain delineation clearly shown. <br /> <br />AUGUST 2002 <br /> <br />FLOODPLAIN <br />MANAGEMENT <br /> <br />CH4-113 <br />