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<br />Water Year 1991 <br /> <br />Downstream releases for water year 1991 will again be <br />maintained at, or moderately above, the minimum level under <br />most probable and probable minimum scenarios. Diversions <br />for NIlP will likely be 168,000 acre-feet under all three <br />scenarios in water year 1991. Under most probable <br />conditions, live storage in Navajo Reservoir is expected to be <br />1,580,000 acre. feet (93 percent full), at the end of water year <br />]991. <br /> <br />Navajo Reservoir storage \Y3S reduced in 1987 and 1988 to <br />approximately one million acre-feet to accommodate the <br />construction of a concrete cutoff wall design~d to reduce <br />excessive seepage. Construction of the cutoff wall 'W3.S <br />completed in September ]988. The cutoff wall is performing <br />well, having reduced seepage from the reservoir by <br />approximately 70 percent. The 1990 Annual Operation Plan <br />projected that Navajo Reservoir would fill in the summer of <br />1991. Due to continued dry conditions in the San Juan River <br />Basin, this is no longer likely. Navajo Reservoir has not been <br />full since the summer of ]986, and under most probable <br />hydrologic conditions, it will not fill again until 1992. <br /> <br />ACTUAL STORAGE 1990 <br /> <br />THOUSAND ACRE-FEET <br />1800 <br /> <br />~ / ./ <br /> r--, -- <br /> <br />1600 <br /> <br />1400 <br /> <br />1200 <br /> <br />10000 N D J F M A M J J A S <br /> <br />]2 <br /> <br />PROJECTED RELEASES 1991 <br /> <br />THOUSAND ACRE-FEET <br />'00 <br /> <br />... "RO' " r." 8T PR~1l .. "1" "^' .... loll" <br /> I <br /> 1/ \ <br /> / \ <br /> / "'-.., '--, <br /> <br />300 <br /> <br />200 <br /> <br />100 <br /> <br />o <br /> <br />PROJECTED INFLOW 1991 <br /> <br />THOUSAND ACRE-FEET <br />.00 <br /> <br /> <br />PR 810lAlIl <br /> <br />300 <br /> <br />200 <br /> <br />100 <br /> <br />o <br /> <br />PROJECTED STORAGE 1991 <br /> <br />iHOU5AND ACRE-FEET <br />1800 <br /> <br />... "ROil "" -+" ST" OB ~PR " "' <br /> / I h. <br /> ,/ / <br /> ./ / <br /> -- V <br /> ........ r-......., <br /> ......... <br /> I <br /> <br />11I00 <br /> <br />1400 <br /> <br />1200 <br /> <br />1000 <br />ONDJFMAMJJAS <br />