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3. Existing work on Colorado Riyer water supply analyses. particularly the recent SWSI analyses. will be reyiewed and concepts and results incorporated. where appropriate. in tllis study. Considerable interfacing will be required between the technical team performing the study, water administrators, and state legal representatiyes (Colorado Riyer Subunit of AG office). Use of95 years (1909-2003) of historical hydrology is appropriate for the study period rather than tree ring data or ~ynthetic hydrologyL ~l-!~':~'.:e!'~ gli~ _ _ _ _ - historical hydrology will be characterized in terms of preyiously performed synthetic hydrology and drought analysis. Water allocation simulations using a monthh' time step (as opposed to a daily time step) are appropriate for the Phase I study. Analysis of water supply witllin Colorado for a current demand setting will be performed using the existing CDSS tools, including StateMod, the water allocation model that has been implemented for all Colorado Riyer Basin tributaries within Colorado. Analysis of Colorado Riyer Compact proyisions and additional supply m~ailable to Colorado will be based on preyious ilwestigations. Based on those preyious inyestigations, an interpretation will be made of reasonable range of compact depletion entitlements and flow requirements for Colorado. Groundwater sources of supply will not be included in the Phase I Study giyen limited Phase I budget and linlited (when compared to surface supplies) groundwater sources. The Phase I analysis will not include future demands (at request of the IECC). No sensitiyity analysis will be performed of current or future deyelopment leyels on basin outflows or depletions. For example. the transmountain diyersions will be placed at current leyel of deyelopment throughout the study period instead of some future leyel of demand/diyersion. _ - [Though some discussion has occurred among roundtable :lleiilbers - on- the - - - - - - future of the prior appropriation doctrine in Colorado. general consensus indicated that the prior appropriation doctrine proyides a proper analysis framework for Phase I water allocation studies witllin Colorado.] _ _ _ _ _ _ _ _ _ _ _ 4. 5. 6. 7. 8. 9. 10. 11. TECHNICAL APPROACH: 1. Scone of Work Refinement - As one of the main purposes of tllis study is to proyide valuable input to Basin Roundtable members who are eyaluating water shortages and water supply alternatiyes, it is important to haye general consensus between the Roundtable members that the scope of work of this study would provide valuable input to their processes. Therefore. the draft scope of work will be presented to the IECC initially for comments. refined in consideration of those comments and subsequently be proyided to the basin roundtable members for comment prior to finalizing the scope under which the study will be performed. Colorado River Water A \'ailability Study Scope 3 June 25. 2007 Draft Comment: Have \ve considered doing something similar to the synthetic hydrology approach 1:elly described in a pmverpoint presentation he sent out? Is this feasible? 1v1y understanding is it is based on historic 11O\\'s, but provides some of the probablitiy or risk analysis \ve are hoping to incorporate. Deleted: The Phase I analysis will also not include - Comment: I suggest removing tillS guideline. I think it is more geared at compact administration \vhich is part of phase II.