2020-01 Performance Audit Report: Contingency Plans at County of Hawai'i's Department of Water Supply

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the WSCP (up to 20 percent mandatory conservation), the Water Authority will continue to deploy or enhance Level 1 strategies and tactics as needed, and will consider supplemental strategies and tactics... • Level 3-4 Strategies and Tactics: In the event of a more severe supply shortage or demand management period that requires entering Level 3 or 4 of the WSCP (up to 30 percent or 40 percent mandatory conservation, respectively), the Water Authority will continue to deploy or enhance Level 2 strategies and tactics as needed, and will consider supplemental strategies and tactics... • Level 5-6 Strategies and Tactics: In the event of a situation that requires entering Level 5 or 6 of the WSCP (up to or greater than 50 percent mandatory conservation, respectively), the Water Authority will continue to deploy or enhance Level 3-4 strategies and tactics as needed, and will consider supplemental strategies and tactics... to reflect increased shortage conditions... • Catastrophic Shortage Communications: In the event of a natural disaster, infrastructure failure or other situation that requires regional water use to be quickly prioritized for or limited to essential public health and safety needs, the Water Authority will immediately deploy or enhance appropriate communication strategies and tactics from WSCP Levels 1-6 as needed, and will consider strategies and tactics... to reflect the need for urgent, emergency -driven water conservation... ➢ Seattle Public Utilities Water Shortage Contingency Plan July 2006: In the Introduction section, it states: "This plan provides guidelines for Seattle Public Utilities (SPU) to manage water supply and demand in the event of a supply problem. Such problems could include imminent supply disruptions resulting from a major pipeline failure as well as forecasted water supply shortages due to droughts. "Water shortage" as is discussed in this document means that SPU will not have the normal amount of water to provide to its customers. It is extremely improbable that SPU would ever run out of water. The stages noted in the plan will be implemented depending on the magnitude of the water shortage. This document supplements the 2007 Water System Plan, and updates the April 2001 Water Shortage Contingency Plan (WSCP). In this plan, section 3 explains the different phases of their Curtailment Plan. In summary, we note the following contents of their plan: • Advisory Stage: o Overview: The public is informed as early as meaningful data are available that a water shortage may occur. Department of Water Supply Contingency Plan Appendix A 122