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<br />i,., <br /> <br />f':', <br />'1;;;.,: <br />S,'," <br />Y.~(~"-:. <br /> <br />in the river bank into Salton Sea. Following the closure <br /> <br />of the break, the construction of an extensive system of <br /> <br />'I, <br /> <br />River protective levees in Mexico Vias undertaken. <br /> <br />Development of the Yuma Valley in Arizona was also <br /> <br />started during this per-iod, requiring the construction of <br /> <br />a levee along the east side of the River the entire length <br /> <br />of that valley, as shown on the map of the delta <br />(Exhibit 2). This levee eliminated over 50,000 acres of <br /> <br />the area theretofore available to the River for overflow <br /> <br />and deposition of silt. The first levee was constructed <br /> <br />on the west side of the River in Mexico in 1907-08. It <br /> <br />extended from the California-Mexico boundary south for a <br /> <br />distance of about twelve miles and was known as the C. D. <br /> <br />Levee. This prevented overflow from the upper portion of <br /> <br />the River in Kexico reaching the Mexicali and Imperial <br /> <br />Valleys through the Alamo Canal. <br /> <br />In 1908, in order to shut off the overflow from <br />Volcano Lake in Mexico into New River and thence through <br />Imperial Valley into Salton Sea, construction of the <br /> <br />Volcano Lake Levee from Cerra Prieto to the northeast was <br /> <br />;\\~ <br />"Ji~' <br />).J <br />.. <br />'0' <br />.\ <br /> <br />started. ~lis was built along the low, flat ridge which <br />is tho divide between the part of the delta draining into <br />Salton Sea and that draining into the Gulf of California. <br /> <br />For a nunwer of years prior to 1909, the main course of <br /> <br />the River had been along the easterly side of the delta, <br /> <br />- 7 - <br />