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<br />Nambe Falls Reservoir
<br />Nambe Falls began 1999 with the reservoir at elevation 6820,33 ft providing a storage
<br />volume of 1678 AF, During the winter, releases averaged about 1,1 ft3/S, to maximize
<br />conservation storage as agreed to by the Pojoaque Valley Irrigation District (PVID) and
<br />Indian water users, The reservoir filled and spilled three times in 1999. The first spill
<br />started on February 28 through March 1, the spill ended when releases for irrigation
<br />started on March 1 and drew the water surface elevation down in the reservoir. The
<br />second spill began on May 22 and ended on July 5, and corresponded with inflow
<br />from spring runoff filling the reservoir, The third spill started on August 5 and ended
<br />on September 7, Maximum releases of 72 ft3/s occurred from July 7 through July 8,
<br />After the last spill ended on September 7, the reservoir then continued to decline for
<br />the remainder of the year reaching its lowest point of the year on October 25 at an
<br />elevation of 6,816.91 ft (1,510 AF),
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<br />As a result of the reservoir's cyclical operation, a higher than normal depletion of
<br />1,111 AF was computed at Otowi. Cyclical operations of Nambe Falls Reservoir
<br />consist of non-irrigation season operations and irrigation season operations, During
<br />non-irrigation season (November through April), all inflow in excess of the bypass
<br />requirement of 0,5 ft3/s is stored until an elevation of 6825,60 ft is reached, Once an
<br />elevation of 6825,60 ft is attained, the outlet gates are regulated weekly to stabilize
<br />the reservoir at 6825,60 ft, or an elevation determined by 100 percent ice cover. An
<br />uncontrolled spill begins at elevation 6826,6ft, which is the top of the spillway crest,
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<br />. .,'..... :;;
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<br />During irrigation season (May through October), waterii.s stored and released on
<br />demand to meet downstream requirements, This depletion (1,1.11 AF). exeeeded the
<br />1,030 AF PVID Heron allocation set aside to offset Nambe Falls storage, Although.
<br />the 1,030 AF is a "soft number," a depletion close to this amount is typically
<br />computed at Otowi during an average year" San Juan-Chama replacement water was
<br />released in June, July, August, and October to. offset the depletions for NambeFalls
<br />operations in the amount of 1,136 AF, which is the equivalent release. from Heron,
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<br />Nambe Falls Reservoir ended 1999 atelevation 6,824,51 ft (1 ,903AF), A summary
<br />of the reservoir operation is shown on Table 5 (page 5), and the return flow credits are
<br />accounted for in Tables 6, 7, and 8 (page.s 6-8). " .
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<br />T
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<br />San Juan-Chama Water at Otowi
<br />San Juan-Chama water used above Otowi is shown on Table 7 (page 7) and SJ-C
<br />water at Otowi is shown on Table 8 (page 8),
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<br />iv
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