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<br />20 Chapter 5-HistoricaJ Salinity Conditions <br /> <br />900 <br /> <br />.-.. <br />...:l <br />~ 800 <br />S <br /> <br />t> <br />oa' <br />;:: 700 <br />as <br />en <br /> <br />- <br />as <br />:l <br />l: 600 <br />l: <br />-< <br /> <br />;:-18 <br />as <br />4) 16 <br />~ <br />.... <br />a 14 <br /> <br />'-" <br />It 12 <br />o <br />- <br />r... 10 <br />.... <br />as <br />E 8. <br />l: <br />-< 6 <br /> <br />500 <br />1940 <br /> <br /> <br />1950 <br /> <br />1960 <br /> <br />1970 <br /> <br />1980 <br /> <br />1990 <br /> <br />Year <br /> <br />Figure1.-Annual salinity at Imperial Dam (1941-89). <br /> <br />20 <br /> <br /> <br /> <br />4 <br /> <br />1940 <br /> <br />1950 <br /> <br />1960 <br /> <br />1970 <br /> <br />1980 <br /> <br />1990 <br /> <br />Year <br /> <br />Figure 2.-Annual flow at Hoover Dam (1941-89). <br /> <br />