UWM Plan - Municipal Water District of Orange County

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Section 3 Water Sources and Supply Reliability Recharge Management The Basin is recharged by multiple sources. These include artificial, i.e., man-made systems, and incidental or natural recharge. One of OCWD’s core activities is refilling or replenishing the Basin to balance the removal of groundwater by pumping. OCWD currently owns and operates more than 1,000 acres of recharge facilities in and adjacent to the Santa Ana River and Santiago Creek. Historical groundwater flow was generally toward the ocean in the southwest, but modern pumping has caused groundwater levels to drop below sea level inland of the Newport-Inglewood fault zone. This trough-shaped depression encourages sea water to migrate inland, which if unchecked, could contaminate the groundwater supply. Strategic lines of wells in the Alamitos and Talbert Gaps inject imported and reclaimed water to create a mound of water seaward of the pumping trough to protect the Basin from seawater intrusion. In addition to operating the percolation system, OCWD also operates the Talbert Barrier in Fountain Valley and Huntington Beach, and participates in the financing operation of the Alamitos Barrier in Seal Beach and Long Beach. The barriers help prevent seawater intrusion and also help refill the Basin. Sources of recharge water include Santa Ana River (SAR) baseflow and storm flow, Santiago Creek Flows, imported supplies purchased from Metropolitan, supplemental supplies from the upper SAR Watershed, and purified water from recycled plants. Imported Water from Metropolitan via MWDOC is one source of groundwater replenishment. OCWD is able to increase allowable pumping from the Basin, above the natural safe yield, via the purchase of replenishment water. Delivery of replenishment water is interruptible and is not always available. When surplus replenishment water is not available for extended periods, OCWD continues to allow pumping above the Groundwater Basin’s natural safe yield. Under this operation, the Orange County Basin draws on stored water to sustain this level of pumping. Depending on the severity of the drought and local supply conditions, this operation can be sustained for two to three years before the Basin reaches significant overdraft (greater than 500,000 acre-feet storage level). OCWD must then cut back pumping until refill of the Basin occurs via heavy rainfall or when the replenishment supply becomes available from Metropolitan. This close coordination of the Basin’s operation with the Metropolitan replenishment program benefits the local service area with enhanced pumping levels in most years. Metropolitan also sells treated non-interruptible water to OCWD for injection into the Talbert Seawater Barrier. This water assists in the protection of the Basin from seawater intrusion. Direct replenishment water is received at OCWD’s recharge facilities in the cities of Anaheim and Orange and is physically recharged into the Basin through percolation. Municipal Water District of Orange County 2010 Regional Urban Water Management Plan Final 3-26
3.3.2. San Juan Basin Section 3 Water Sources and Supply Reliability The San Juan Basin is located in southern Orange County within the San Juan Creek Watershed and is comprised of four sub-basins: Upper San Juan, Middle San Juan, Lower San Juan and Lower Trabuco. The basin is bounded on the west by the Pacific Ocean and otherwise by tertiary semi-permeable marine deposits. San Juan Creek drains the San Juan Valley, and several other creeks drain valley tributaries to the San Juan. The primary water-bearing unit within the Basin is Quanternary alluvium - a heterogeneous mixture of sand, silt, and gravel in the eastern portion of the basin to coarse sand near the center to fine-grained lagoonal sediments in the western portion of the basin. Thickness of the alluvium average about 65 feet and may reach more than 125 feet. The total storage capacity has been estimated to be 90,000 AF. Wells typically yield from 450 to 1,000 gallons per minute (gpm). Recharge of the Basin is from flow in San Juan Creek, Oso Creek, and Arroyo Trabuco and precipitation to the valley floor. Water from springs flows directly from Hot Spring Canyon into San Juan Creek adding to recharge. Figure 3-6 depicts the San Juan Basin. Municipal Water District of Orange County 2010 Regional Urban Water Management Plan Final 3-27
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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
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
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Page 39 and 40: Section 2 Water Demand These target
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Page 43 and 44: Section 2 Water Demand Legislation
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Page 57 and 58: State Water Project Programs and Lo
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Page 91 and 92: 4.2. BMP Implementation in MWDOC Se
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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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