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<br />OJ2815 <br /> <br />e <br /> <br />DRAFT <br /> <br />e <br /> <br />used by the Secretary of the Interior in consultation with the Basin <br />, <br /> <br />States tO~~lop:~he annual operating plan. <br /> <br />1.3 Description of Study Process <br /> <br />The first step in the study process was the preparation of hydrology, <br />depletion, and system characteristics data. This consisted of updating <br /> <br />the CRSS hydrology data base through 1983, creating additional synthetic <br />hydrology data bases, updating and making corrections to the depletion <br /> <br />data base, and updating system characteristics and modeling routines. <br />This latter i;em included changes;to forecast values, the powerplant <br />simulation routine~'~rea-capacity values to include sediment, starting <br /> <br />conditions, the 602(a) storage routine, and addition of Taylor Park <br />Reservoir. rl'e:>e. c.11I:W'".1~~ C.ioIA-'c:.. Dr-I'€. fJt ~II,,,,,~J 11'1 <br /> <br />,\~ The next step consisted of developing a method of operating the system <br />\c: { <br />\ \o~!~a that would yield a number of alternative operating strategies. Each <br />~Q}P . .r <br />\~\ ol~1ol v~ alternative ,operating strategy is characterized, by the probability of <br />\.Y ",'I, i:..,...... \~j1Q~e{ <br />:\\~ 'I r 0 ""IV' ' <br />\ 0.:.1. \r not having to make flood control releases. For the purposes of this <br />\~ 0\ lC~ <br /> <br />~~o <br /> <br />. <br />, Q.; ,IV <br />. \\f \.yv <br />~Q{ if <br />J\:,;LJ <br />\~'\ <br /> <br />r4;P1; <br />o (et{(),I' <br /> <br />o <br /> <br />study, flood control releases are defined as any releases in excess of d ~."c.i \'"" -the. <br />~ ~"",I..tI.;t fc:> f1vod l-~ry..hc\ ...c\c.ll"i,..."S t:l-S " ,.... Iltnl <br />" 1-\""" e.. ,r;ltJoCl ~ <br />the strategy-di ctated annual rei eases.' S~ategy-di ctated annua 1 ~V'k..h........ <br /> <br />releases from Lakes Powell and Mead are calculated based on obtaining <br />reservoir levels such that the probability level of possible inflows ~ IS <br />equal to the desired risk level~(probability of not having to make flood <br />.------- ~---- <br /> <br />control releasesJ. <br /> <br />In order to obtain a general idea of what impacts might be expected from <br />various management strategies, a basic simulation model containing the <br /> <br />5 <br /> <br />?U' WlOJeJ ~ <br />CS <br />