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002975 ;.:;r.~,;) PLANS OF OPERATION FOR 1!172 Thl'eo detailed monthly plans have been made for operation of all facilities of the Western Divi ~ion in C'onfornl1ty with cstablishe{l erjtcl'ia. Two of the plans simu- late Western Oi vision System operations with extremely high or extremely low water supply conditions. Reservoir int10ws e1uring 1972 have a 1-in-10 chance ofhoing'less than tho reasonable minimum anda l-in-IOchaIH';'" of being greater than the reasonable maximum. Therefore, actua] operations during 1972 have an S-in-l0 chance of falling within the limits of the two cxtreme plans. The third pl:ln sin1ld:ltcs operations wHh most proh~lJle \\,:11.('1' ::.;upply (:()nditiol1S. A summary of the three pions for Water Year IG72 is shown in Table 4. Planned roscn'oir operations are showngraphicCllly on Exhibits 1-11. Anticipateelproject water deliveries are shown graphically on Exhibit 12, !.;~~;:;\ ",5.:';:--.)' ".';..- The three plans are intended to provide the means anel t1exibility for systematic change from the most probable plan should reasonable minimum or reasonable maximum runoff conditions develop. Constantly changing water supplies, irri- gation reqLlirements, power loads, and maintenance outages will also require many adjustments. The plan of operation includes provision for all planned. outages of system facil\ties for maintenance, but will be adjusted as required by. unforeseen conditions or problems. Water supply forecasts for the Western Division System will commence on February 1, 1972, and continue the first of each succeeding month through July 1, 1972. Subsequent plans of operation for the system will be based upon forecasted water supply conditions. Plan of Operation for the October-January Period The three plans of operation for the October-January period are similar under all conditions of inDow. During this period, planned routine maintenance on all system features can be accomplished without special operations. Total Western Division System storage at the end of Water Year 1971 was 148 percent of the recent 10-year average and 10 percent above last year. Green Mountain Green Mountain Reservoir storage at the beginning of Water Year 1972 was 142,000 acre-feet which was above normal. The cities of Denver and Colorado Springs would not store or divert Blue River water during the October-January 22 t~~;/t ~f.:;;.~.':.~:' :}..:""---.~ ~ ~~~ ~J:(j~:~ ;:.;. ", ~ ';.;,;-::,0::.. ~~f~ (~~~~~!f:~~ ~;{~;'I ~"".,.", t~,;f:~~~;~ ~~f[t; r':--'-"';'" ~t~;~~~ ff.~1Jij ~~~.~(~,~ II :\:{':~~~: ~~~ii;:.1 '.' ,I ~~I ~t;~{\~ ~~'~'};:i ~tFh:1 i::.~~:~>:; ~~~;' 1.""".."'[ rJ\~~A '.:"".::';'.;''-' : :-}., . ~: .:: ;.:'.:~'~ ..~., .....:;,... ;.::~~.-:.:, . t;<:..~:. .,...-...... ".-'.. ;..:;.<.... ".-.". ".:. ~. .,",-,. .'>'.:...~..'.,; ::,::~:;i:j-\,~f?:)',.;C"'-:; .... . ~ ..._::: 'J.. ...._:." . '"_', .. . ...... .:: ':'::"':??)?I<\~:;;i;i!;~~:ij~";r;~~Y/~{.zrf~;i\:;.;{~;:"i::~f?~!i.[:N;;J;:~51~~;~;;:;F}~S'i:f~t~~p::;,:;.;.: