Laserfiche WebLink
<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 />I <br />I <br /> <br />APPENDIX II <br /> <br />A limited number of copies of this appendix has been produced for planners, <br /> <br />engineers, developers, and others concerned with flood plain management on <br /> <br /> <br />Chalk Creek. It was prepared by the U. S. Department of Agriculture, Soil <br /> <br /> <br />Conservation Service, in cooperation with the Colorado Water Conservation <br /> <br /> <br />Board and Chaffee County. <br /> <br />Included are computations for a theoretical floodway capable of carrying the <br /> <br /> <br />100-year frequency discharge at an increase in rise in water surface eleva- <br /> <br /> <br />tion above the pre-floodway water surface elevation. Data are in computer <br /> <br />printout form and include floodway widths, cross sectional flow area, and <br /> <br />average velocities. Computations are for an increase in rise of water <br /> <br />surface in 0.5' increments from 0.0' to 1.5' above the 100-year flood. The <br /> <br />theoretical floodway was computed on the basis of equal conveyance reduction <br /> <br />from each side of the flood plain. The USDA-SCS floodway program developed <br /> <br />by the Soil Conservation Service, is the methodology used for the computa- <br /> <br />tions. <br /> <br />The data are keyed to the original cross sections and are compatible for use <br /> <br />with the flood profiles, flood hazard area maps, and other exhibits in the <br /> <br />main report. The floodway stationing at each cross section is from left to <br /> <br />right when viewed in a downstream direction. <br />