CC 2015-05-26_08a Monthly Water Supply and Demand Update NIRRO)oo
INCORPORATED
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it 0 JULY 10, 1911 MEMORANDUM
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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
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