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<br />002982 <br /> <br />short list of alternatives for further consideration. The extended baseline hydrology will then be <br />used to determine the sensitivity of the short list alternatives to the hydrology. <br /> <br />2.3.3 Baseline Conditions <br /> <br />For purposes of determining the contribution of each alternative toward the 20,000 acre-feet, the <br />baseline condition will be the StateMod Cl Scenario, with the RIPRAP projects and without the <br />60,000 acre-feet or 120,000 acre-feet of new depletions, as detailed in Appendix D of the PBO. <br />The StateMod Cl Scenario has the following components of RIP RAP flows incorporated into the <br />scenarIO : <br /> <br />. 5,000 acre-feet per year from Ruedi Reservoir, <br /> <br />. 5,000 acre-feet in 4 out of 5 years from Ruedi Reservoir, <br /> <br />. 10,825 acre-feet per year from Ruedi Reservoir under long-term lease, <br /> <br />. 10,825 acre-feet per year on a permanent basis divided equally between east slope and <br />west slope water users (presently Williams Fork and Wolford Mountain Reservoirs), <br /> <br />. 6,000 acre-feet per year from Wolford Mountain Reservoir, <br /> <br />. Up to 28,400 acre-feet per year of water resulting from construction of improved water <br />management features for the Grand Valley Water Management Project. <br /> <br />CROP will not be included in the baseline hydrology to be used in Phase 2. At the conclusion of <br />investigating each of the alternatives to be analyzed in Phase 2, the alternative will be subjected <br />to necessary and appropriate sensitivity analysis to determine if CROP is likely to affect the <br />feasibility of the specific alternative. <br /> <br />Sensitivity analysis will be used in a similar fashion with respect to the 120,000 acre-feet per <br />year of future depletions. At the conclusion of investigating each of the alternatives in Phase 2, <br />the alternative will be subjected to necessary and appropriate sensitivity analysis to determine if <br />feasibility of the alternative is affected by including the 120,000 acre-feet per year of future <br />depletions in the baseline hydrology. <br /> <br />2.3.4 Flow Targets <br /> <br />As indicated in (1) a memo from the Service (Maddux, February 2,1999), (2) a meeting with the <br />Service (April I, 1999) and (3) the PBO (U.S. Fish and Wildlife Service, 1999, pg. 11), the <br />Service is first and foremost interested in augmenting the peak of the spring runoff hydro graph <br />with an additional 20,000 acre-feet of water on an average annual basis. The Service's priority is <br />to increase spring peak flows when the hydrograph peak is expected to be in the range of 12,900 <br />to 26,600 cfs at the head of the IS-Mile Reach or approximately 29,000 cfs at the Cameo USGS <br />gage (Coordinated Reservoir Operations Group, 1999 and personal communication from George <br /> <br />p:\dataigen\Ocwcb\ 18133\rcport\phase-l \chap-2,doc <br /> <br />2-8 <br />