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CC 2015-05-26_08a Monthly Water Supply and Demand Update NIRRO)oo INCORPORATED Z; it 0 JULY 10, 1911 MEMORANDUM ORtp TO: CITY COUNCIL FROM: GEOFF ENGLISH, DIRECTOR OF PUBLIC WORKS BY: SHANE TAYLOR, PUBLIC WORKS SUPERVISOR— UTILITIES SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE DATE: MAY 26, 2015 RECOMMENDATION: It is recommended the City Council receive and review the monthly Water Supply and Demand Update report. IMPACT ON FINANCIAL AND PERSONNEL RESOURCES: The cost to provide the monthly Water Supply and Demand Update report is approximately $500. BACKGROUND: The continuing severe drought is impacting the City's water supply and demand. As a result, the City Council adopted an Ordinance on February 24, 2015 to establish emergency water restrictions and regulations to manage the City's water supply. It was recommended during this discussion that the City Council receive monthly updates on the current supply and demand statistics. This information will provide the Council with the data required to make decisions relating to Emergency Water Shortage Restrictions and Regulations. ANALYSIS OF ISSUES: The severe drought continues and current rainfall is 47% less than normal. Lopez Lake is currently at 37% capacity. The Low Reservoir Level Response Plan (LRRP) has been enacted, although at this time, there are no reductions to municipal water deliveries. The LRRP, as adopted by Council, includes automatic water delivery reduction triggers at 15,000 Acre Foot (AF) and 10,000 AF. The LRRP also has an Adaptive Management mechanism to allow the San Luis Obispo County Flood Control and Water Conservation District Zone 3 Technical Advisory Committee (TAC) to recommend alterations to the automatic triggers based on atmospheric and storage projections. Item 8.a. - Page 1 CITY COUNCIL MONTHLY WATER SUPPLY AND DEMAND UPDATE MAY 26, 2016 PAGE 2 At the TAC meeting on May 7, 2015, the TAC representatives recommended that the deliveries from the Water Treatment Plant be reduced by 10% starting April 1, 2015. This is in advance of the Lake reaching 15,000 AF of storage, which is the automatic reduction trigger. The recommendations will be on the Advisory Board agenda on May 21, 2015. For the water year 2014/15, which ended March 31, 2015, the City's water use was 13% below water year 2013/14. Based on current use and weather patterns, the lake is predicted to reach the 15,000 AF storage level in October 2015 unless the current weather pattern changes. The projected Lopez supply for water year 2015/16 for Arroyo Grande is 2,942 AF, which includes 883 AF of carry-over water. Based on the projected water demand of 3,300 AF, we expect to be able to meet the demand in water year 2015/16 with minimal groundwater pumping. Ground water levels are the same as last year in March. Minimal pumping of the City's entitlement from the Santa Maria Groundwater Basin (SMGB) is anticipated in water year 2015/16. ADVANTAGES: No advantages noted at this time. DISADVANTAGES: No disadvantages noted at this-time. ALTERNATIVES: Not applicable at this time. ENVIRONMENTAL REVIEW: No environmental review is required for this item. PUBLIC NOTIFICATION AND COMMENTS: The Agenda was posted in front of City Hall on Thursday, May 21, 2015. The Agenda and staff report were posted on the City's website on Friday, May 22, 2015. Attachments: 1. April 2015 Water Supply and Demand Charts 2. Lopez Reservoir Storage Projections Item 8.a. - Page 2 ATTACHMENT 1 0 N a m Ln (jy)2wweway AlddnS ^ M ° ° ° O O O N Do m N O O y O O O O m Y O O O O O O (p Co) ¢ OEi `~ O `o a 00 G r y Z ♦ d a o C N7 o G ♦ 'a N c ♦ ? 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