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<br />nl'1"''II ",,!' <br />U~I'lH,.JO <br /> <br />MEMORANDUM <br /> <br />TO: <br />FROM: <br />SUBJECT: <br />DATE: <br /> <br />Ray Tenney <br />Chuck Brendecke <br />Results of Preliminary Model Scenarios <br />July 7,1993 <br /> <br />Attached are selected results of the model runs that were defined at the June 15 <br />Technical Steering Group (TSG) meeting. The primary model results pertain to development <br />of revised estimates of the Juniper Contemplated Draft (CD). The revised CD was estimated <br />under two general assumptions about water rights administration--Full Subordination of the <br />Juniper rights and Full Augmentation of existing and future junior uses by releases from the <br />enlarged Elkhead and Stagecoach reservoirs. <br /> <br />The assilmed operating parameters of the Juniper rights in both scenarios were as <br />follows: <br /> <br />1) only the three 1954 water rights for Deadman Bench (550 cfs), the power <br />plant (1000 cfs) and storage (844,000 at) were represented <br /> <br />2) Juniper Reservoir was assumed to have a total capacity of 844,000 af with <br />dead storage of73,226 af <br /> <br />3) as between the three Juniper rights, the Deadman Bench right was assumed <br />to take available water first and the storage right was assumed to take <br />water last <br /> <br />4) releases from storage were made to supplement Deadman Bench and power <br />plant flows as necessary , <br /> <br />5) the storage right was allowed to divert 844,000 af each water year <br />regardless of carryover <br /> <br />The Full Subordination scenario reflects subordination of the Juniper rights to all <br />existing and future junior water uses associated with the 2040 demand scenario. This was <br />accomplished by modeling the Juniper rights as being junior to all demands and junior to <br />filling of Steamboat Lake and the enlarged Elkhead and Stagecoach reservoirs. Attachment A <br />contains selected results of this model scenario. <br /> <br />The Full Augmentation scenario reflects the "peel-off" of Juniper priorities to the three <br />reservoirs (Steamboat, enlarged Elkhead, and enlarged Stagecoach) and the release of water <br />from those reservoirs to augment existing and future uses with rights junior to the Juniper <br />rights. This scenario was run iteratively, subtracting the drafts of the three reservoirs from the <br />Juniper draft, so that the total system draft was the same as the unsubordinated draft of the <br />Juniper project by itself. This is necessary to insure that the "peel-off" does not reflect an <br />expansion of the Contemplated Draft. The results of this scenario are found in Attachment B. <br /> <br />Finally, Attachment C contains certain data requested at the June 15 meeting regarding <br />treatment of reservoir evaporation and historical flows at Maybell. <br /> <br />cc: Technical Steering Group <br /> <br />Hydrosphere Resource Consultants 1002 Walnut Suite 200 Boulder, Colorado 80302 <br /> <br />~ <-,l..:i-e:~",--:__",,' <br /> <br />:1 "'"",,, <br />