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<br />t "") r. ? <br />I d.L c...' <br /> <br />'".-..., <br />. " <br /> <br />" <br /> <br />{~!2~ <br /> <br />'. ',~ <br /> <br />The February 1 forecast of the April-July runoff indicated that the <br />inflow would be well below normal. To conserve water for the irriga- <br />tion season, releases from Boysen Reservoir were gradually cut from <br />1,100 ft3/s on February 7, to 300 ft3/s by March 14. <br /> <br />:~~~~ <br /> <br />, '~';~ <br /> <br />".... <br />..'~,. <br />....:. <br /> <br />At the request of the river commissioner, irrigation releases were <br />initiated on April 11. Releases were increased, as needed to meet <br />irrigation demands (from about 300 ft3/s on April 11, to a full <br />irrigation supply of about 1,100 ft3/s on May 11.) <br /> <br />. '.~ ,'.. <br />':.';.< <br />,.,:,;-".;:;. <br /> <br />.0:".", <br /> <br />, :"';.~:'.: <br /> <br />With good cooperation between the irrigators, the Bureau of <br />Reclamation, and the river commissioner, efficient reservoir operations <br />were possible during the 1977 irrigation season. Releases were <br />regulated as closely as possible to meet downstream irrigation needs <br />and, as a result, reservoir drawdown was held to a minimum. <br /> <br />):::~., <br />; ;;:~.;:: . <br />~:;~.;:~.;:,: <br />."\:-. <br /> <br />,'".,. <br /> <br />".pO <br /> <br />.'..,-~"'~ <br /> <br />;:;~.:::~ <br /> <br />On September 21, a test was conducted on the hollow jet valves by <br />operating each valve from 0 to 500 ft3/s and back to 0 ft3/s. The <br />test period lasted for approximately one-half hour. <br /> <br />'-: ',~.; <br /> <br />@.ii; <br /> <br />,...,'.. <br />:,;,;":~:;i <br />.......... <br /> <br />A year-end storage of 473,000 acre-feet was below a 17-year average <br />of 687,000 acre-feet. <br /> <br />..:.';.' <br />~}./. <br />......~: <br /> <br />;~ <br />....:;:'..'.;.: <br /> <br />Buffalo Bill Reservoir <br /> <br />" .' <br />.' ", '.~., <br /> <br />. ~... <br /> <br />There were 318,800 acre-feet of water stored in the reservoir at <br />the beginning of the water year which was above normal. <br /> <br />~i~{:'~ <br /> <br />..{~:-:,. <br /> <br />I <br /> <br />i.,",. ~";'" <br /> <br />:.~:-<~; <br /> <br />Inflows to Buffalo Bill Reservoir were below average during the entire <br />1977 Water Year. Fall and winter inflows were 80 percent of normal. <br />Winter precipitation was very light and, as a result, the April 1 <br />forecast indicated that the April-July runoff would be about 413,000 acre- <br />feet, or 55 percent of normal. Spring weather was very mild and dry. <br />Inflows to Buffalo Bill continued very low during March, April, and <br />early May. Good rains occurred during the middle of May, and inflows <br />climbed rapidly to near normal spring levels for about 2 weeks in <br />June. Reservoir storage rose steadily during late May and early June <br />but did not fill the reservoir. Storage reached a peak of 312,000 acre- <br />feet at elevation 5341.90 on June 25, 18 feet below the top of the <br />conservation pool. Inflows dropped to record low amounts late in <br />June and continued very low through the end of the year. <br /> <br />:>:-;'. <br />,..- ....~:.; <br />:'ft: <br />;..,.":' <br />tY~~'\ <br />\:0....... <br />~::/:~.; <br />~.: :;. <br />'. ...~.',. <br />.::~...... <br />,':,". <br /> <br />:~}~> <br /> <br />: ...'~-" " <br />{~;~ <br />~<'.J <br />:,;:::;' <br /> <br />Inflows during the April-July period were 310,000 acre-feet, or 42 per- <br />cent of average and the lowest April-July inflow of record. During <br />the May-September period, releases were held at minimum irrigation <br /> <br />"';",:.: <br />;....'. <br /> <br />...;'. <br /> <br />"..' <br />.-'. <br /> <br />~... :.~:". <br /> <br />.,'; <br /> <br />. ,.~: <br />'. '" <br /> <br />:". 'F <br /> <br />19 <br /> <br /> <br />:'~ ... .' '. .. <br />. '. '.'." ~'.' <br />c', _~~:~ .;; <br /> <br />'....",.... <br /> <br /> <br />.-...... <br />" , <br /> <br />.',. <br />