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<br />A.I-,r' <br />78;' ""j') METROPOLITAN WATER DISTRTCT <br />I- ~ <br /> <br />Continued also was the natura] softening of the Lake Mead stored <br />water by the depmdtion of lime, as shown by the white ring around <br />the shoreline and by lime sludge deposition on the reservoir bottom. <br />The carbonate hardness of Lake Mead outflow, as sampled at the <br />aqueduct intake, averaged 126 parts per million in 1949, a~ in the <br />previous year, compared with 160 p.p.m. for Lake Mead inflow <br />as an average for the last 10 years. <br /> <br />Ra.;nfall at Los Ani/eles <br /> <br />Rainfall at the Los Angeles station of the U. S. Weather Bureau <br />for the season ending June 30, 1949 totaled 7.99 inches, or 52.5 <br />per cent of the 73-year average of 15.22 inches. This followed the <br />even more severe season of 1948 with only 7.22 inches and was the <br />fifth successive year of subnormal rainfall, the first such occurrence <br />in the period of record. The cumulative deficit in rainfall over this <br />period of drouth is now practically two full years of normal rainfall. <br />The reduction in regional runoff and effect on ground-water sup- <br />plies, especiall.v in basins already overpumped, have been little <br />short of disastrous. <br /> <br /> ^ <br /> " <br /> 5 <br /> . <br /> . <br /> ~ <br /> , <br /> , <br /> . <br />~ <br />~ <br />0 <br />, ~ <br />. <br />~ ~ <br />~ , <br />:5 <br />~ <br />. <br /> <br /> <br />Ill..lo.-I"-I~~" t.I.'iII~I~I'I~"1 t'"ul ~~,^".~~'41'..ol~" .1'1"1'" .~I'~'_~.lo.l_"_I'~' '.10 <br />I :: "::;;;';';lti!il;:;I;:;li,;i~;jJ~;~~iJ,;t'~~~j;I,~i:,~~;;;2~;~;II;:I;~i~;:;!i;~~:;~I;: <br />-5; r 'fH H.H,~ I 1 I'~ I " <br />tlillT "~'ITII~I'I c~" 1:'~':"'I;20 <br />I ~_,..L."" ITTj----'- I ,- <br />I 1 I _ I 15 <br /> <br />I <br /> <br /> <br />J <br /> <br />Fig. 7. Rainfall record at Los Angeles <br />