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<br /> <br />Steel flaahboard!l being lnal.lled on Or;~.Canyon 8PI'iiway <br /> <br />A final report which summarized the study <br />findings and recommended a new flood <br />control operation plan for Hoover Dam was <br />released July 1983. Flood control storage <br />space will be maintained In Lake Mead as <br />stipulated In the Report's Field Working <br />Agreement between Reclamation and the <br />Corps for flood control operation of Hoover <br />Dam and Lake Mead. These regulations <br />establish releases in a manner that maximizes <br />public benefits In the United States wllh <br />reasonable consideration for conditions In <br />Mexico. <br /> <br />As was stated earlier, large flood control <br />releases were made .fr~m the m~Jt;)r storage <br />reservOlrs ss.they filled to capacity from the <br />runoff and began to spill In late June and early <br />July. Flow over the spillways of Hoover Oem <br />occurred for the first time In Its history, except <br />for 8 test of the structure In 1941. The <br />maximum dally release. during th61983 <br />flooding were 92,600 cfs from Glen Canyon <br />Dam, 50,800 cfs from Hoover Dam, 45,100 cts <br />from Davis Dam, and 40,300 cfs from Parker <br />Dam. <br /> <br />There has been flood damage to structures, <br />dikes, and other tacllllles along the Colorado <br />River. Private businesses and residences, and <br />Federal Government facilities were affected. <br />While the design channel cap.clly <br />downstream from Davis and Parker Dams Is <br />40,000 cfs, flood-plain development 'nd <br />encroachment results In significant flood <br /> <br />damages at lesser tlows. Maximum flows <br />from Davis and Parker Dams were less than <br />the levee design of 50,000 cts. Flood damage <br />was generally limited to properties located on <br />the flood plain Inside the levee system. <br />Releases have remaIned near the maximum <br />'evel. experlanced during the flooding In <br />order to evacuate adequate storage space In <br />the reservoirs prior to the water year 1984 <br />runoff. <br /> <br />The reservoIr system has been operated In full <br />accordance with established operatIng crIteria <br />and the Corps flood control regulations. The <br />combined effect at the Upper Basin <br />reservoirs, Including Flaming Gorge and. Lake <br />Powell, and Lower BasIn reservoirs, Lake <br />Mead, Laf<e Mohave, and Lake Havasu, was <br />to reduce the flow of the Lower Colorado River <br />tram approximately 128,000 to about 40,000 <br />cfs. Until river flows decrease, detailed <br />assessment of flood damage cannot be made. <br /> <br />Total Colorado River reservoir system storage <br />at the start of water year 1983 was <br />approximately 54,030,000 acre-feet and about <br />58,962,000 acre.feet at the end of the water <br />year, representing a 4,932,000 acre--feet <br />decrease In totar remaining available resarvolr <br />space. <br /> <br /> <br />laguna Oe.m and galas, Arlzona-Calltorni.. <br /> <br />In addition to the malnstem structures, Alamo <br />Dam on the Bill WillIams RIver, and Painted <br />Rock Dam on the Gila River (both In the Lower <br />Basin) received flood Inflow during the winter <br />months of water year 1983 and also durIng <br />October, 1983. Painted Rock and Alamo <br />Reservoirs are scheduled to be operated at low <br />flood control levels during 1984. <br /> <br />23 <br />