ORD-2003-038 - OWASA Conservation and Demand Management Ordinance

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supplemental supplies, as well as other elements of reasonable professional judgment and management. The determination of drought shortage conditions shall be guided by periodic estimates of the risk (i.e., probability) that water stored in OWASA's reservoir system will decline to unacceptably low levels within the foreseeable future. Until improved or alternative criteria are developed, such guidance shall be based on a five percent or greater risk that total reservoir storage will decline to 20 percent or less of total storage capacity within an 18 month period. This guidance shall apply to the initial declaration of a, Water Supply Shortage or Emergency and shall inform subsequent declarations of more or less severe Water Supply Shortages or Emergencies. IV. B. Water Treatment, Storage, or Distribution Capacity Shortage In addition to conditions caused by drought, OWASA may declare a Water Supply Shortage or Emergency whenever customer demand - as averaged over three consecutive days - exceed 85 percent of OWASA's capability of treating and delivering water. The stage and duration of such a Water Supply Shortage or Emergency shall be guided by the degree to which customer demands approach or exceed OWASA's capacity to meet those demands, and by the degree to which conservation efforts successfully reduce short-term demands. IV. C. Natural and Man -Made Disasters and Catastrophic Equipment and Plant Failure Shortage Any other circumstances, including service losses caused by equipment or facility failure, human error, deliberate act, weather, or other natural disaster, which constrain OWASA's water supply, treatment, or distribution capacity to less than that reasonably needed by its customers, shall constitute a Water Supply Shortage up to and including a Water Supply Emergency, requiring immediate action by OWASA. Article V - Required Actions Under Water Supply Shortage or Emergency Conditions In the event of a water supply shortage, OWASA shall, using its best professional judgment, determine which of the following stages is the most appropriate response to the estimated level of risk. V. A. Water Supply Advisory A Water Supply Advisory shall represent an alert to the public of a potential shortage and notification that water use restrictions may be imposed if the water supply and /or demand conditions do not improve in the near future. In the event of a declared Water Supply Advisory: M