UWM Plan - Municipal Water District of Orange County

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Section 2 Water Demand Within a Regional Alliance, each retail water supplier will have an additional opportunity to achieve compliance under both an individual target and a regional water use target. • If the Regional Alliance meets its water use target on a regional basis, all agencies in the alliance are deemed compliant. • If the Regional Alliance fails to meet its water use target, each individual supplier will have an opportunity to meet their water use targets individually. Individual water suppliers in the Orange County 20x2020 Regional Alliance will state their participation in the alliance, and include the regional 2015 and 2020 Urban Water Use Targets in their individual UWMPs. As the reporting agency for the Orange County 20x2020 Regional Alliance, MWDOC has documented the calculations for the regional urban water use reduction targets. MWDOC will also provide annual monitoring and reporting for the region on progress toward the regional per capita water use reduction targets. 2.4.3. Steps to Calculate Regional Target Water suppliers in a Regional Alliance are provided three options for calculating their regional targets 2 . To preserve maximum flexibility, the Orange County 20x2020 Regional Alliance has selected the first option. There are two steps under this approach. Under the first step, each water supplier in the Regional Alliance first calculates its individual target in its retail UWMP as if it were complying individually. Under the second step, the individual targets are weighted by each supplier’s population and averaged over all members in the alliance to determine the regional water use target. Step 1 - Retail Agency Compliance Targets As described above, the first step in calculating a regional water use target is to determine each water supplier’s individual target. DWR has established four target options for urban retail water suppliers to choose from in calculating their water use reduction targets under SBx7-7. The four options include: • Option 1 requires a simple 20% reduction from the baseline by 2020 and 10 percent by 2015. • Option 2 employs a budget-based approach by requiring an agency to achieve a performance standard based on three metrics o Residential indoor water use of 55 GPCD o Landscape water use commiserate with Model Landscape Ordinance 2 Steps for calculating a Regional Alliance can be found in Methodology 9 from the Technical Methodologies. Municipal Water District of Orange County 2010 Regional Urban Water Management Plan Final 2-9
Section 2 Water Demand o 10 percent reduction in baseline CII water use • Option 3 is to achieve 95% of the applicable state hydrologic region target as set forth in the State’s 20x2020 Water Conservation Plan. • Option 4 uses a target calculator developed by DWR. This option is provisional and will be updated by DWR before 2014. MWDOC has analyzed each of these options, and has worked with all water suppliers in Orange County to assist them in selecting the most suitable option to document in their UWMPs. Step 2 - Regional Water Use Reduction Targets Calculation The regional water use targets for the Orange County 20x2020 Regional Alliance are calculated by weighting the individual water use targets by population and averaging them over all members of the alliance. This calculation is provided below in Table 2-7. Column (1) shows the 2010 population for each individual supplier. The individual targets for each supplier is provided in column (2) for the interim 2015 targets, and column (4) for the final 2020 targets. To calculate the weighted averages for each retail water supplier, the population is multiplied by the individual targets to get a weighted total for each individual supplier. This is found in column (3) for the interim 2015 targets and in column (5) for the final 2020 targets. The regional targets for the Orange County 20x2020 Regional Alliance are then derived as the sum of the individual weighted averages divided by the total population for a regional alliance. For example, the 2020 water use target for the city of Brea is 220 gpcd, and the 2010 population is 40,368. By multiplying this 2020 target by the population, the result is a weighted average of 8,864,740. The sum of the weighted averages for all members of the Orange County 20x2020 Regional Alliance is 491,862,589. By dividing this weighted total by the regional population of 3,139,017, the resulting regional 2020 water use target is 157 gpcd. The source of the information in Table 2-7, including the population figures, is from within the individual UWMPs for each water supplier in the Orange County 20x2020 Regional Alliance. Municipal Water District of Orange County 2010 Regional Urban Water Management Plan Final 2-10
Page 1 and 2: Municipal Water District of Orange
Page 3 and 4: Table of Contents Contents Executiv
Page 5 and 6: Table of Contents 6. Recycled Water
Page 7 and 8: Table of Contents List of Figures F
Page 9 and 10: Acronyms GAC GAP GMFP GPCD gpm GRF
Page 11 and 12: Message from the Board of Directors
Page 13 and 14: Executive Summary • Offer opportu
Page 15 and 16: Executive Summary When comparing su
Page 17 and 18: Executive Summary • Promoting par
Page 19 and 20: 1. Introduction 1.1. Urban Water Ma
Page 21 and 22: Section 1 Introduction • Long-ran
Page 23 and 24: Section 1 Introduction term by vote
Page 25 and 26: Section 1 Introduction For more tha
Page 27 and 28: Section 1 Introduction Orange Count
Page 29 and 30: Section 2 Water Demand 600,000 2.5
Page 31 and 32: Section 2 Water Demand Table 2-1: C
Page 33 and 34: Section 2 Water Demand used to fill
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Section 3 Water Sources and Supply
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4. Demand Management Measures 4.1.
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4.2. BMP Implementation in MWDOC Se
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Section 4 Demand Management Measure
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4.2.4. DMM 4: Metering with Commodi
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Section 5 Water Supplies Contingenc
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6. Recycled Water 6.1. Agency Coord
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Section 6 Recycled Water outfalls a
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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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