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<br />Table 3. - Annual augmentation estimates <br /> <br /> North American <br />.. Upper Basin Percent estimated Percent <br />Year computed virgin virgin flow augmentat ion augmentation <br /> flow at Lee Ferry of 35-year potent i a 1 potent i a 1 <br /> (1,000 acre-feet) average (1,000 acre-feet) <br />1952 20,665 152 2,052 9.9 <br />1953 10,636 78 1,060 9.9 <br />1954 7,661 56 940 12.2 <br />1955 9,188 67 1,045 1L4 <br />1956 10,749 79 1,348 12.5 <br />1957 20,095 148 1,878 9.3 <br />1958 16,489 121 1,631 9.9 <br />1959 8,609 63 1,024 11.9 <br />1960 11,263 83 1,240 11.0 <br />1961 8,457 62 1,086 12.8 <br />1962 17 ,299 127 1,641 9.5 <br />1963 8,450 62 982 11.6 <br />1964 10,156 75 1,025 10 .1 <br />1965 18,913 139 1,695 8.9 <br />1966 . 11 ,208 82 948 8.4 <br />1967 11,907 87 1,173 9.8 <br />1968 13,664 100 1,331 9.7 <br />1969 14,386 106 1,331 9.2 <br />1970 15,405 113 1,492 9.7 <br />1971 15,070 111 1,384 9.2 <br />Aver'age 13,014 95 1,315 10.1 <br />(J.952-1971 ) <br />Aver'age <br />(1942-1976) 13,614 <br /> <br />In c~tual cloud seeding practice, however, the entire augmentation <br /> <br />potential will not be realized due to various suspensions to reduce <br />avalanche and flood risks and lessen possible social and environmental <br /> <br />dangers. An average 10- to 20-percent reduction in the augmentation <br /> <br />18 <br />