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<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 />DIVERSION <br /> <br /> <br />A diversion would divert river or floodflow. from the ..in river <br /> <br /> <br />around a potential damage area to reenter at .0.. point downatre... The <br /> <br /> <br />hydrologic effect i. the reduction in the pe.k di.charge down.tre.. from <br /> <br />the diversion on the main channel, which would have a corresponding reduc- <br /> <br /> <br />tion in damages. The 8IIOunt of this reduction depends on the ..ount of <br /> <br /> <br />floodwater diverted. With a diversion, there .hould be a minimal change <br /> <br /> <br />in hydraulic elevation from the point of diversion to where it reenters <br /> <br /> <br />the stream. Otherwise, drop structures would be required with a diversion <br /> <br /> <br />project to control flows. <br /> <br />A channel diversion having two alignment options was considered at <br />Kalt.. Option 1 was the use of the existing Dodson irrigation canal loca- <br />ted west and south of the city. The invert for the canal is approximately <br />equal to or slightly below the 500-year water .urface profile for the Kilk <br />River. This would require that the Dodson Canal be deepened to allov con- <br />veyance of Kilk River flows and would IIOst likely interfere with its <br />normal irrigation operations. The second channel diversion option vas to <br />divert Kilk River peak flows through a newly excavated channel farther <br />south of Kalta. Flows would return to the Kilk River by way of another <br />tributary entering the Kilk River downstre.. from Kalta. However, any <br />route taken would require an excavation to a depth of at least 50 feet or <br />more over a distance of 2 or 3 miles. Plate 4 displays the alignments of <br />the two diversions. Neither diversion option was considered technically <br />viable. <br /> <br />LEVEES AND PLOODWALLS <br />The combined earth-bermed levee and floodwall for .ubarea I was <br />determined to be the most technically viable and economicallY feasible <br />measure for the flood problems at Kalta. This measure was studied in <br />detail as shown in the following paragraphs. <br /> <br />24 <br />