Eric H Feedback - CRWaterAvailabilityScopeDraf

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Availability Study will be used in cOl1iunction with results from the needs assessment in the formulation and evaluation of water supply alternatives. Based on IECC input. we believe that the Phase 1 study goals should be to provide answers to the following questions: 1. What are reasonable long term estimates of the water available in Colorado River subbasins (after current uses) - without consideration of the Colorado River Compacts? What are reasonable estimates the current level of depletions of Colorado River subbasins? How does the total depletion compare to that estimated to be m-ailable (a range of values) to Colorado under the Colorado River Compacts? What are reasonable estimates of the current level offlows of Colorado River subbasins that leave the state? How does the total flows compare to the requirement generally estimated (a range of values) from Colorado under the Colorado River Compacts? What sensitivity do the results to the first tluee questions have if the estimated historical flow base is reduced (across the board) by [5%, 10%, or 20%11 _ 'Il!i~ __ question is intended to generally address possible hydrologic impacts of climate change, more severe hydrologic periods, more severe than historical droughts, etc. Characterize the "variability and risk" in the estimated water m-ailability from question 1. 2. 3. 4. 5. The Colorado Water Consen-ation Board is charged with the evaluation of the water availability in the Colorado River, working in full consultation and active invoh-ement of the basin roundtables. Tlus scope anticipates that most of the study would be performed by CWCB staff, as assisted by consultants as dictated by CWCB staff workload considerations and need for expe11s in various fields. The envisioned organizational structure to perform this study is shown in Figure 2. GENERAL GUIDELINES FOR STUDY 1. It is recognized that the Phase I study will focus on remaining water supply under a current use ~nvironment 9~1!~r_a~p~~t~ 9! ~9!~1~~<:> !zj~-~r_ '~'!t~~ _ _ _ _ _ _ - - m-ailability such as alternative supply formulation and analysis, RICD impacts, ESA Limitations, etc. are left for future phases. A glossary of key terms and defl1utions (i.e. SWSI defined terms where appropriate) will be prepared to allow a clear interpretation and understanding of study results. 2. Colorado River Water A \'ailability Study Scope 2 June 25. 2007 Draft - Comment: I think we will need some justification or basis for these. See my . - suggestions lUlder Task 9. Comment: Again. more details on the phases. It can either go here, or refer back to the section above.