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<br />, <br /> <br />, <br /> <br />. <br /> <br />. <br /> <br />shall be selected for each cross section based on the roughness <br />conditions (chanl,~l, woods, fields, etc.) encountered in the reach <br />of the cross sect Lon. Past flood data if available shall be used <br />to verify the adc!)ted roughness coefficients, taking into consid- <br />eration any alter~tion in the channel subsequent to the floods. <br />I <br />i <br />! <br /> <br />(2) Bridge losses shall be analyzed by any of the <br />methods: <br /> <br />following <br />I <br /> <br />I (a) Methods described in the Bureau of Public <br />. <br />ROads publication, "Hydraulics of Bridge Waterways," Hydraulic <br /> <br />Dr'ign Seri" N;~)"B::::::':":::::~' n,ing o'o"'y 'pao,d ero" <br /> <br />s, ct~ons. <br /> <br />(c), Appropriate orifice and weir formulas. <br /> <br />(3) Adequacy of Goose Pasture Tarn Reservoir and <br />spillway must be determined. Spillway integrity and capacity shall <br />be visually investigated and appropriate 'flood routing through the <br />structure will be accomplished. <br />i <br />t '. h d 1 . d' . <br />I e. Descr~pt~on of Met 0 0 oqy Use . - Br~ef narrat~ve <br />describing methodology used for hydrologic and hydraulic analyses, <br />tbgether with computation displays and computer printout sheets <br />if any, shall be made available to the contracting authority for <br />review prior to preparing final flood profiles and flooded area <br />I <br />maps. <br /> <br />f. Composition of Report. - <br /> <br />(1) The report, "Flood Plain Information - Colorado <br />Rver and Rifle, Government and Hubbard Gulch Creeks, Rifle, <br />Cchorado, April 1973," furnished by the contracting authority, <br />shall be used as a sample for guidance in preparing the report <br />\ <br /> <br />ulder this(::nt:::t~ontents, arrangement of the text, type style, <br /> <br />and type spacing shall follow the sample report. An alternate <br />type style may be used if authorized by the contracting authority. <br />I <br />(3) Drafting of the plates shall be in the manner that <br />is used in the sample report. <br /> <br />(4) If a flood photograph is not available for the <br /> <br />-~- <br />