Water Shortage Contingency Plan
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2020 Water Shortage Contingency Plan San Diego County Water Authority May 27, 2021 This page intentionally left blank Water Shortage Contingency Plan San Diego County Water Authority Sandra L. Kerl, General Manager Dan Denham, Deputy General Manager Tish Berge, Assistant General Manager This plan prepared under the direction of: Kelley Gage, Director of Water Resources Denise Vedder, Director of Public Affairs Prepared by: Jeff Stephenson, Water Resources Manager Tim Bombardier, Principal Water Resources Specialist Alexi Schnell, Water Resources Specialist This page intentionally left blank TABLE OF CONTENTS Section Page Section 1 - Introduction ............................................................................................................................................ 1-1 1.1 Introduction .................................................................................................................................................. 1-1 1.2 Reliability ....................................................................................................................................................... 1-2 1.3 Defining Drought ......................................................................................................................................... 1-3 1.4 Senate Bill 606 .............................................................................................................................................. 1-4 1.5 Organization of the Water Shortage Contingency Plan ................................................................ 1-4 Section 2 - Plan Preparation and Re-Evaluation .............................................................................................. 2-1 2.1 Drought Management Plan ..................................................................................................................... 2-1 2.1.1 Member Agency Technical Advisory Committee ............................................................................ 2-1 2.1.2 Principles ........................................................................................................................................................ 2-1 2.1.3 Report Approval .......................................................................................................................................... 2-4 2.2 Water Shortage and Drought Response Plan .................................................................................. 2-4 2.3 Water Shortage Contingency Plan ....................................................................................................... 2-5 2.4 Plan Re-Evaluation ...................................................................................................................................................... 2-5 Section 3 – Historic Drought Response and Shortage Management Actions ......................................... 3-1 3.1 Significant Drought and Shortage-Related Events (2007 to 2011) ......................................... 3-1 3.2 Significant Drought and Shortage-Related Events (2014 to 2017) ......................................... 3-4 3.3 Lessons Learned .......................................................................................................................................... 3-8 Section 4 - Annual Municipal and Industrial Water Reliability Analysis…………………………………….4-1 4.1 Analysis of Water Authority Supplies and Demands .................................................................... 4-2 4.1.1 Water Authority Core Water Supplies ................................................................................................ 4-2 4.1.2 Member Agency Projected Water Demands on the Water Authority .................................... 4-3 4.1.3 Supply Augmentation ................................................................................................................................ 4-3 4.2 Regional Reliability Analysis Calculation .......................................................................................... 4-5 4.3 Transitional Special Agricultural Water Rate……………………………………….....................4-5 4.4 Reliability Analysis Tentative Timeline……….……………………………………….....................4-6 Section 5 - Regional Shortage Response Actions and Levels……………………………………………………… 5-1 5.1 Regional Shortage Levels and Response Actions ........................................................................... 5-1 5.2 Potential Response Level Triggers ....................................................................................................... 5-4 Section 6 - Extraordinary Demand Reduction Measures…………………………………………………………...6-1 6.1 Examples of Extraordinary Demand Reduction Measures ......................................................... 6-1 6.2 Model Drought Ordinance ....................................................................................................................... 6-1 Section 7 – Municipal and Industrial Supply Allocation Methodology .................................................... 7-1 7.1 Introduction .................................................................................................................................................. 7-1 7.2 Description of Allocation Methodology .............................................................................................. 7-3 7.2.1 Historic Base Period Demands on the Water Authority (Unadjusted) .................................. 7-3 i 7.2.2 Adjustments .................................................................................................................................................. 7-3 7.2.3 Adjusted Base Period Demands and Supply Allocation Percentages ..................................... 7-7 7.2.4 Water Authority Supply Availability and Net Cutback Percentages ....................................... 7-7 7.2.5 Member Agency Initial Allocation of Water Authority Supplies .............................................. 7-8 7.2.6 Additional Adjustments ............................................................................................................................ 7-8 7.2.7 Carryover Storage Program ................................................................................................................. 7-10 7.2.8 Member Agency Final Total M&I Allocation .................................................................................. 7-11 7.2.9 Regional Reliability Adjustment ......................................................................................................... 7-12 7.2.10 Data Reconcilation ................................................................................................................................... 7-14 7.2.11 Future Updates to Allocation Methodology ................................................................................... 7-14 7.3 Member Agency Transfers Secured Following Allocation Methodology ........................... 7-16 Section 8 – Catastrophic Water Shortage ........................................................................................................... 8-1 8.1 Integrated Contingency Plan .................................................................................................................. 8-1 8.2 Emergency Storage Project ..................................................................................................................... 8-1 8.3 Emergency Water Delivery Plans – 2012 Update .......................................................................... 8-2 8.4 Multi-Hazard Mitigation Plan ................................................................................................................. 8-3 Section 9 – Communication Plan ........................................................................................................................... 9-1 9.1 Introduction .................................................................................................................................................. 9-1 9.2 Coordination ................................................................................................................................................. 9-1 9.3 Flexibility and Adaptability ..................................................................................................................... 9-2 9.4 Key Audiences .............................................................................................................................................. 9-3 9.5 Communication Objectives...................................................................................................................... 9-3 9.6 Normal Period Communications ........................................................................................................... 9-4 9.7 Level 1 Strategies and Tactics ................................................................................................................ 9-4 9.8 Level 2 Strategies and Tactics ................................................................................................................ 9-7 9.9 Level 3-4 Strategies and Tactics ............................................................................................................ 9-9 9.10 Level 5-6 Strategies and Tactics ......................................................................................................... 9-11 9.11 Catastrophic Shortage Communications......................................................................................... 9-12