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<br />GeOlOgy <br /> <br />The geology of the Jordanelle <br />Damsite is a complex sequence <br />of volcanic rlows that were de- <br />posited about 30 million years <br />ago. Later, faulting and pro- <br />longed periods of erosion due <br />to glacial melt ha,-c modified <br />the topography to form the <br />upper Provo Canyon of today. <br />The hardness of the rock at the <br />damsite and its ability to with- <br />stand erosion has created the <br />nafrow gorge suitable for the <br />placemem of the Jordanelle <br />Dam. <br /> <br />Core samples have been obtained <br />from drill holes to test the sta- <br />bility of the surface rock, and <br />surface geology has been mapped <br />for design data. Two other dam <br />axes were evaluated near the <br />proposed dam site. Borrow <br />materials, gravels, and lean clays <br />that will make up the earth-dam <br />material have been located with- <br />in the reservoir boundary. <br />Drilling and testing is being con- <br />ducted to provide further infor- <br />marion for the dam design and <br />(0 monitor ground-warer <br />movement, <br /> <br /> <br />J <br /> <br />I <br />It <br /> <br />... <br />.. <br /> <br /> <br />. <br /> <br />- <br /> <br />"'It <br /> <br />- <br /> <br />I <br /> <br />Irrigation <br /> <br />An irrigation segment in rhe <br />Municipal ;Ind Industrial <br />Water System will help meet <br />the supplemental irrigation <br />water needs for land that pre- <br />sentlv receives n;Hural flow and <br />has Ifmited storage in Wasatch <br />and Summit Counties, with <br />minor shonages. <br /> <br />The Project will supply more <br />water in the late summer season <br />by consen.ing and storing abun- <br />dant spring 110ws which some. <br />tim~s damage cropland, Sup- <br />plementalland consists of , <br />12.7-W acres that would reCel\'e <br />1-+.100 acre-feet ofwarcr, <br />