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<br />. <br /> <br />. <br /> <br /> <br />Engineers, Hydrologic Engineering Center in Davis, Calif. An <br /> <br />acceptable method for calculating head losses at bridges is the <br /> <br />Federal Highway Administration publication "Hydraulics of Bridge <br /> <br />Waterways" Hydraulic Design Series '1, 2nd Edition. <br /> <br />Floodplain Information Report <br /> <br />The results of the floodplain information study shall be <br /> <br />documented in a report which shall be bound, titled, paged and <br /> <br />shall include the following minimum information: <br /> <br />1. Brief description of the study area. <br /> <br />2. Drainage basin map including limits of floodplain study <br /> <br />reach. <br /> <br />3. Flood History of the study area. <br /> <br />4. Brief description of the hydrologic technique used to <br /> <br />calculate the IOO-year flood. <br /> <br />5. The IOO-year discharge in the study area. <br /> <br />6. Brief description of the hydraulic method used to calculate <br /> <br />the IOO-year water surface elevation. <br /> <br />7. Table of HW elevations for all cross-sections used in the <br /> <br />study. <br /> <br />8. Water surface profile for the IOO-year flood. <br /> <br />9. Flooded area map for the IOO-year flood showing location <br /> <br />of channel and floodplain cross-sections used in the study. <br /> <br />The sample report "Floodplain Information Centennial River---" <br /> <br />has been prepared by the Colorado Water Conservation Board and may <br /> <br />be used as a guide. <br /> <br />Technical Addendum <br /> <br />The technical addendum required by the CWCB for the review of <br /> <br />-6~ <br />