Contents Overview ....................................................................................................................................................... 3 Section 1 – Analysis of Supply Reliability and Seismic Risk Assessment....................................................... 6 1.1 Supply Reliability Scenario Planning............................................................................................ 6 1. 2 Catastrophic Interruption ............................................................................................................ 7 1.3 Seismic Risk Assessment and Mitigation Plan ............................................................................. 9 1.4 Multiple Dry Year Analysis and Drought Risk Assessment ........................................................ 12 Section 2 – Annual Water Supply and Demand Assessment Procedures................................................... 15 2.1 Water Supply and Demand Assessment Requirements............................................................ 15 2.2 Annual Water Supply and Demand Assessment Procedures .................................................... 16 Section 3 – Six Standard Shortage Stages ................................................................................................... 26 3.1 Imported Water Shortage ......................................................................................................... 27 3.2 Emergency Supplies................................................................................................................... 28 3.3 Stages of Action by Level ........................................................................................................... 30 Section 4 – Additional Shortage Response Actions .................................................................................... 34 4.1 Standard IRWD Practices for Shortage Response ..................................................................... 34 4.2 Voluntary Reduction Measures ................................................................................................. 35 4.3 Use of Budget-Based Rates ....................................................................................................... 36 4.4 End-Use Prohibitions ................................................................................................................. 39 4.5 Critical Shortage Measures........................................................................................................ 39 4.6 Operational Drought Control Measures.................................................................................... 40 Section 5 – Communication Protocols ........................................................................................................ 41 Section 6 – Compliance and Enforcement .................................................................................................. 43 Section 7 – Legal Authorities ...................................................................................................................... 44 Section 8 – Financial Consequences ........................................................................................................... 45 8.1 Cost of Compliance.................................................................................................................... 46 Section 9 – Monitoring and Reporting........................................................................................................ 47 Section 10 – WSCP Refinement Procedures ............................................................................................... 48 Exhibit A – Draft Water Shortage Contingency Resolution ........................................................................ 50 Exhibit B – EPA Emergency Response Plan (ERP) Certification Receipt and Confirmation ........................52 Exhibit C – Orange County Water and Wastewater Multi-Jurisdictional Hazard Mitigation Plan.............. 53
Appendix E - 2
IRWD – 2025 Urban Water Management Plan – WSCP
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