CC 2015-04-28_08g Monthly Water Supply_Demand Update pRROVO
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INCORPORATED 7
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P 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: APRIL 28, 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 in Consultant services and approximately two staff hours.
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 24th to establish emergency
water restrictions and regulations to better 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 44% less than normal. Lopez Lake
is currently at 38% capacity, approximately 18,500 Acre Foot (AF). 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, automatic
water delivery reduction triggers at 15,000 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.g. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
APRIL 28, 2015
PAGE 2
At the TAC meeting on April 2, 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. This recommendation will be discussed at a special TAC meeting in
the coming weeks. The potential for a 10% delivery supply reduction will be presented
to the Council if formally recommended by the Zone 3 TAC.
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 total production. 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 meeting the Governor's Executive Order, the water demand for
2015/16 will be 2,400 AF. We will be able to meet the anticipated 2,400 AF demand in
water year 2015/16 with minimal groundwater pumping and without the imposition of
emergency water use restrictions.
Current ground water levels are the same as March 2014 levels. Minimal pumping of
the City's entitlement from the Santa Maria Groundwater Basin (SMGB) is anticipated in
water year 2015/16.
As previously requested by Council, staff will provide a report on Tuesday, May 26,
2015 for consideration of implementation of Stage I Emergency Water restrictions as
outlined in Section 13.05 of the Arroyo Grande Municipal Code as amended by
Ordinance on February 24, 2015. Consideration of Stage I Emergency Water
restrictions on May 26, 2015 will allow for staff to include information related to the final
version of the State mandated water reduction requirements. The final regulations will
be adopted by the Water Quality Control Board on May 5th or 6th, 2015.
ADVANTAGES:
No advantages noted at this time.
DISADVANTAGES:
No disadvantages noted at this time.
ALTERNATIVES:
The following alternatives are provided for the Council's consideration:
1. Receive and review the monthly Water Supply and Demand Update report; or
2. Provide staff other direction.
ENVIRONMENTAL REVIEW:
No environmental review is required for this item.
Item 8.g. - Page 2
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
APRIL 28, 2015
PAGE 4
PUBLIC NOTIFICATION AND COMMENTS:
The Agenda was posted in front of City Hall on Thursday, April 23, 2015. The Agenda
and staff report were posted on the City's website on Friday, April 24, 2015.
Attachments:
1. March 2015 Water Supply and Demand Charts
2. Lopez Reservoir Storage Projections
Item 8.g. - Page 3
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