Laserfiche WebLink
<br />7 <br /> <br /> <br />~ [jydrolo~y <br />00 <br />--.J In this study the same basic hydrologic and river operation <br />W <br />criteria have been retained as used in earlier Bureau, of Reclamati.on <br /> <br />studies,'modified only to accommodate extension of the runoff record <br /> <br />through the year 1967 and the addition of 2.0 to 2.5 m.,1.f. of <br /> <br />desalted water in Lake Mead annually. Stich an addition, llowever, <br /> <br />w()uld 113ve appreciable effects. It would increase ~he wilter supply <br /> <br />for the Lower Basin and, by eliminating the question of Upper Basin <br /> <br />responsibility for a portion of the Mexican Treaty delivery, assure <br /> <br />the Upper Basin of a greater water supply. Water quality in the <br /> <br />Colorado River below Hoover Dam would be measurably improved. <br /> <br />Lower Basin Water Supply--Without augmentation and with a <br /> <br />regulated delivery of 8,250,000 acre-feet annually at Lee Ferry, <br /> <br />it is estimated that the average water supply available [or <br /> <br />consumptive use in the Lower Basin at Lee Ferry would decrease <br /> <br />by the year 2030 to 6,830,000 acre-feet Bnd the assured water <br /> <br />supply to 6,310,000 acre-feet. With augmentation and with a <br /> <br />regulated delivery at Lee Ferry of 7,500,000 acre-feet annually, <br /> <br />comparable figures would be 7,730,000 acre-feet average supply <br /> <br />and 7,500,000 acre-feet ass~red supply. <br /> <br />From these figures, it can be seen that the amount of augmen- <br /> <br />tation needed to assure the Lower Basin of 7.5 -m.a.f. of consumptive <br /> <br />use in the year 2030 would be 1,940,000 acre-feet annually <br /> <br />{0,500,000 - 6,310,000) + (8,250,000 - 7,500,00017. For tlle <br /> <br />basic stu-dy of thi.s report, we have rounded this fi.gure tl) <br />