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e e THE METROPOLITAN WATER DISTRICT OF SOUTHERN CALIFORNIA Water Budget 550 KAF 130-200 KAF 100-IIOKAF < 20 KAF> 56.2 KAF 21.5 KAF < 35 KAF> < 31.5+KAF > Budget and Adjustments Priority 4 Water Use Cap lID I SDCW A Transfer & MWD I SDCW A Exchange From lID- 1988 Agreement To CVWD-Approval Agreement From lID: All-American Canal Lining Project From CVWD: Coachella Canal Lining Project To CVWD For Miscellaneous I Indian PPRs if no Priority 6 water or under use of Priority 1,2 and 3b Priority 4, Transfers and Other Adjustments When available, Priority 5 and surplus water From lID / CVWD- when Priority 6 water available Underuse of Priorities I and 2 771-851 KAF 662 KAF 38 KAF + KAF In years when there are insufficient direct Colorado River supplies and transfers available for a full Colorado River Aqueduct, other supplies will be substituted to provide a full Aqueduct or other non- Aqueduct supplies available to MWD will be used. COLORADO RIVER AQUEDUCT/ 4.4 MAF A V AILABLE 771-851 KAF 16 KAF 383-463 KAF 1.25 MAF MWD SLR Dry year options, stored water, Hayfield, Cadiz or other Projects Full Aqueduct Improved River Management and Operations. The Criteria for Coordinated Long-Range Operation of the Colorado River Reservoirs (LROC) reflect the multiple purposes for which the reservoir system is operated. Resources management requires the optimization of the operation of the Colorado River System reservoirs to satisfy the growing needs of these purposes. This is particularly important since federal augmentation of the River as envisioned in the 1968 Colorado River Basin Project Act has not occurred. The Colorado River has been widely developed through great investments by many water and power agencies and the federal government to provide system storage of 60 million acre-feet. The reservoir system and its extensive storage allows the Colorado River to be efficiently managed so as to optimize the beneficial use ofthis resource which supports more than 20 million people as well as multi-billion dollar business, manufacturing and farming economies. During the development of the LROC, it was anticipated that the level and growth of water needs for this period and beyond would be such that little or no surplus water would occur, and did not contemplate a prolonged interim period of surplus water. Most efforts relating to reservoir operations in the development of the LROC focused on shortage criteria. As a result, current Colorado River management tends to maximize the amount of water held in storage in the near-term. This strategy tends to force more flood control releases in wet years, in excess of downstream needs, and limits the ability to divert and store such water for subsequent use. In normal and dry years, this strategy leans towards not releasing water to users even though there is a significant probability for the next fifteen years of surplus water releases in excess of needs and the ability to store and divert such water. Overall, the current strategy does not optimize the use of this valuable resource because it does not take full advantage of the high volume of storage created by the extensive infrastructure on the river for conserving and beneficially using surplus water. To provide for improved river management and operations during this interim period of surplus water, the Key Terms propose Revised Surplus Criteria (Interim Lake Mead Surplus Criteria) to guide reservoir operations to increase the availability of surplus water for use while keeping risk of shortage minimal. The interim surplus criteria has been developed pursuant to Article III (3) of the LROC and would be used in conjunction with the LROC to develop the annual operating plan (AOP). The five-year review process 4