UWM Plan - Municipal Water District of Orange County

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Section 3 Water Sources and Supply Reliability addition of planned supplies under development, Metropolitan’s 2010 RUWMP finds that Metropolitan will be able to meet full-service demands from 2015 through 2035, even under a repeat of the worst drought. Table 3-12 shows the reliability of the wholesaler’s supply for single dry year and multiple dry year scenarios. Table 3-12: Wholesaler Supply Reliability in Meeting Full Service Demands- % of Normal AFY Multiple Dry Water Years Wholesaler Sources Single Dry Year 1 Year 2 Year 3 Metropolitan 100% 100% 100% 100% In addition to meeting full-service demands from 2015 through 2035, Metropolitan projects reserve and replenishment supplies to refill system storage. Table 3-13 shows the basis of water year data used to predict drought supply availability. Table 3-13: Basis of Water Year Data Water Year Type Base Year Base Year Base Year Normal Water Year Average 1922-2004 Single-Dry Water Year 1977 Multiple-Dry Water Years 1990 1991 1992 3.7.2. Factors Contributing to Reliability The Act requires a description of the reliability of the water supply and vulnerability to seasonal or climatic shortage. MWDOC relies on import supplies provided by Metropolitan. The following are some of the factors identified by Metropolitan that may have an impact on the reliability of Metropolitan supplies. Environment – Endangered species protection needs in the Sacramento-San Joaquin River Delta have resulted in operational constraints to the SWP system. The Bay-Delta’s declining ecosystem caused by agricultural runoff, operation of water pumps and other factors has led to historical restrictions in SWP supply deliveries. SWP delivery restrictions due to the biological opinions resulted in the loss of about one-third of the available SWP supplies in 2008. Legal – Listings of additional species under the Endangered Species Act and new regulatory requirements could impact SWP operations by requiring additional export reductions, releases of additional water from storage or other operational changes impacting water supply operations. Additionally, the Quantification Settlement Agreement has been challenged in courts and may have impacts on the Imperial Municipal Water District of Orange County 2010 Regional Urban Water Management Plan Final 3-40
Section 3 Water Sources and Supply Reliability Irrigation District and San Diego County Water Authority transfer. If there are negative impacts, San Diego could become more dependent on the Metropolitan supplies. Water Quality –Water imported from the Colorado River Aqueduct (CRA) contains high level of salts. The operational constraint is that this water needs to be blended with SWP supplies to meet the target salinity of 500 mg/L of total dissolved solids (TDS). Another water quality concern is related to the quagga mussel. Controlling the spread and impacts of quagga mussels within the Colorado River Aqueduct requires extensive maintenance and results in reduced operational flexibility. Climate Change – Changing climate patterns are expected to shift precipitation patterns and affect water supply. Unpredictable weather patterns will make water supply planning even more challenging. The areas of concern for California include the reduction in Sierra Nevada snowpack, increased intensity and frequency of extreme weather events, and rising sea levels causing increased risk of levee failure. Legal, environmental, and water quality issues may have impacts on Metropolitan supplies. It is felt, however, that climatic factors would have more of an impact than the others. Climatic conditions have been projected based on historical patterns; however severe pattern changes may occur in the future. Table 3-14 shows the factors resulting in inconsistency of supply. Table 3-14: Factors Resulting in Inconsistency of Supply Name of Supply Legal Environmental Water Quality Climatic State Water Project X X X Colorado River X X X These and other factors are addressed in greater detail in Metropolitan’s 2010 RUWMP. 3.7.2.1. Water Quality Imported Water - Metropolitan is responsible for providing water of a high quality throughout its service area. The water that Metropolitan delivers is tested both for currently regulated contaminants and for additional contaminants of concern as over 300,000 water quality tests are conducted each year to regulate the safety of its waters. Metropolitan’s supplies originate primarily from the Colorado River Aqueduct (CRA) and from the State Water Project (SWP). A blend of these two sources, proportional to each year’s availability of the source, is then delivered throughout Metropolitan’s service area. Municipal Water District of Orange County 2010 Regional Urban Water Management Plan Final 3-41
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Municipal Water District of Orange
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Table of Contents Contents Executiv
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Table of Contents 6. Recycled Water
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Table of Contents List of Figures F
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Acronyms GAC GAP GMFP GPCD gpm GRF
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Message from the Board of Directors
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Executive Summary • Offer opportu
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Executive Summary When comparing su
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Executive Summary • Promoting par
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1. Introduction 1.1. Urban Water Ma
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Section 1 Introduction • Long-ran
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Section 1 Introduction term by vote
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Section 1 Introduction For more tha
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Section 1 Introduction Orange Count
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Section 2 Water Demand 600,000 2.5
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Section 2 Water Demand Table 2-1: C
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Page 39 and 40: Section 2 Water Demand These target
Page 41 and 42: Section 2 Water Demand under SBx7-7
Page 43 and 44: Section 2 Water Demand Legislation
Page 45 and 46: 3. Water Sources and Supply Reliabi
Page 47 and 48: Section 3 Water Sources and Supply
Page 55 and 56: 3.2.3. State Water Project (SWP) Se
Page 57 and 58: State Water Project Programs and Lo
Page 71 and 72: 3.3.2. San Juan Basin Section 3 Wat
Page 79 and 80: 3.3.8. Recharge Facilities for OCWD
Page 83: Section 3 Water Sources and Supply
Page 89 and 90: 4. Demand Management Measures 4.1.
Page 91 and 92: 4.2. BMP Implementation in MWDOC Se
Page 93 and 94: Section 4 Demand Management Measure
Page 97 and 98: 4.2.4. DMM 4: Metering with Commodi
Page 115 and 116: Section 5 Water Supplies Contingenc
Page 129 and 130: 6. Recycled Water 6.1. Agency Coord
Page 131 and 132: Section 6 Recycled Water outfalls a
Page 133 and 134: Section 6 Recycled Water IRWD’s r
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Section 6 Recycled Water IRWD Los A
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Section 6 Recycled Water OCWD Groun
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6.4.2. Indirect Potable Reuse Secti
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7. Future Water Supply Projects and
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Section 7 Future Water Supply Proje
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Section 8 UWMP Adoption Process Thi
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Section 8 UWMP Adoption Process Cit
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Appendices A. Urban Water Managemen
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CALIFORNIA WATER CODE DIVISION 6 PA
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and county, city, regional agency,
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(4) A detailed description and anal
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dated December 10, 2008, as it may
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the agencies participating in the p
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service area at the end of 5, 10, 1
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10631, that achieve water savings s
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"Memorandum of Understanding Regard
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Demand “Bump” Factors for 2010
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Table 1. Per-Capita Retail Water Us
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Appendix C California Urban Water C
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Agency: Municipal Water District of
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Urban Water Management Plan checkli
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Calif. Water No. UWMP requirement a
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Municipal Water District of Orange
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List of Tables and Figures TABLES T
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Section 2: Metropolitan Water Distr
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Section 3: Development Process In p
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MWDOC’s allocation plan. Moreover
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Base Period Interim Agricultural Wa
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Shortage Levels: The model allocate
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to 2008; in order to incorporate th
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Section 5: Plan Implementation This
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agencies and Board Committee member
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Tracking and Reporting In preparing
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It important to note, MWDOC does no
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Appendix A List of Acronyms: AF- Ac
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Appendix C MWDOC Growth Adjustment
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Appendix F Letters of Notification
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Appendix H Resolution of Adoption o
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8001 Irvine Center Drive, Suite 110
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UWM Plan - Municipal Water District of Orange County

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