OCR Text |
Show 110 Minimum Mean Maximum UPDATING THE HOOVER DAM DOCUMENTS 3,600,000 acre-feet 5,100,000 acre-feet 6,600,000 acre-feet Note: With a recurrence of the lowest recorded precipitation during the last 50 years for May, June and July, the April-July runoff this year could be as low as 3,000,000 acre-feet. J. Storage - Lake Powell and Lake Mead The following table shows the active storage in Lake Mead and Lake Powell on September 30 (the end of the water year) following the March 13, 1963, initial closure of Glen Canyon Dam, the change in storage during the year, and the annual releases at Lee Ferry and from Lake Mead during the year. Unit 1,000 acre-feet Active storage Annual release from reservoirs at end of year Colo. River Colo. River Year ending Lake Lake Storage change during year below below Pump from September 30 Powell1 Mead2 Lake Powell Lake Mead Powell3 Mead4 Mead5 1964 4,214 11,628 + 3,674 -5,745 2,414 8,234 27 1965 6,466 14,708 + 2,252 + 3,080 10,820 7,917 23 1966 6,423 15,004 - 43 + 296 7,854 7,769 25 1967 6,360 •14,375 - 63 • + 265 7,797 7,832 27 1968 7,514 15,018 + 1,154 + 643 8,334 7,831 31 1969 9,708 16,131 + 2,194 + 1,113 8,823 7,986 34 1970 12,039 16,769 + 2,331 + 638 8,672 7,895 42 1971 13,609 16,886 + 1,570 + 117 8,591 8,233 40 1972 12,488 17,451 -1,121 + 565 9,311 8,267 66 1973 17,284 20,176 + 4,796 + 2,725 10,110 7,937 77 1974 18,010 19,358 + 726 - 818 8,266 8,847 86 1975 20,202 20,154 + 2,192 + 796 9,255 8,374 81 1976 19,640 20,022 - 562 - 132 8,482 8,320 91 1977* 16,143 20,205 -3,497 + 183 8,211 7,562 90 New capacity table in effect April 1, 1967. Excludes dead storage of 1,998,000 acre-feet. Excludes dead storage of 2,378,000 acre-feet (table of 1967). Colorado River at Lee Ferry. Colorado River below Hoover Dam. Total pumpage from Lake Mead. Unpublished records, subject to correction. K. Extent of Deficiencies and Impairment Energy Furnished The following table shows the water releases from Hoover Dam, the actual power generation at Hoover Dam, the energy delivered to the Hoover power allottees, the computed power generation absent and with the filling of the Colorado River Storage Project reservoirs and the accumulated Hoover firm energy deficiencies caused by the accumulation of storage in the Upper Basin reservoirs. (The figures were compiled from the annual reports of the Colorado River Board of California and the Upper Colorado River Commission.) |