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<br />FOREWARO <br /> <br />. <br /> <br />The dimensionless curves presented ill this report arc intended for <br />use in routing the dambreak flood dOl/TI a dry prisr,latic channel. Ti,ree <br />important properties of the flood ~Iave !nay tJe determined: Time of <br />arrival of the wave front, maximu~l flooJ depth. and time of maximufl flood <br />depth. The routing curves were prepared from the results of numerical <br />simulation experilllPnts which solved a dimensionless form of the St. Venant <br />equations. The propagation of the flood wave tip aloll~ tile dry valley floor <br />was calculated, as well as propo!)ation pf tile negative wave as it was <br />reflected from the upstreap, boundary of the reservoir. It \~as possible <br />to express the results in the form of din.ensionless fjraphs. because valley <br />geometry was expressed as a simple, prismatic channel. <br /> <br />In utilizing these graphs, it is nt.cessary to transfom the irregular <br />natural cross sections into one representative prismatic section. The <br />important properties which must be preserved are storage and conveyance. <br />Three basic forms of cross section shape are permitted: rectangular, <br />triangular and parabolic. The equation for expressing the properties <br />of each of these forms. as ~Iell as other equations necessary to util ize <br />the dimensionless graphS, are presenteJ in {\nnex I at the end of this <br />volume. <br /> <br />This report culnlinates a 1 ine of research that started l'lith the <br />project "ilumerical TechniC}ues for Routing the lJani Break Flood on a ury <br />Bed" in which Drs. Theodor Strelkoff ane John Sakkas developed a computer <br />program for calculating the advance of a dam break flood in a dry prismatic <br />channel. In a subsequent research project, "Flooding from Ruptured [jams," <br />the same investigators extended their work to include a solution of the <br />non-dimensional form of the St. Venant equation. This lJasic work Has <br />extended to produce the routing curves presented in tilis report. In Vierl <br />of the many uncertainties involved in routing the dam break flood, the <br />fact that a reach of a river has to be transformed' into a prismatic <br />section is not an overwhelming simplification. <br /> <br />. <br /> <br />-: <br />