CC 2015-03-24_11b Monthly Water Supply and Demand Update/pRRO V0
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MEMORANDUM
4�1FORN�P
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: MARCH 24, 2015
RECOMMENDATION:
It is recommended the City Council receive the monthly Water Supply and Demand
Update.
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 manage the City's water supply should the
expected water demand exceed anticipated supply. It was recommended during this
discussion that the City Council receive monthly updates on the current water supply
and demand statistics. This information will provide the Council 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. The Low Reservoir Response Plan (LRRP) has been
enacted, although at this time, there are no reductions to the municipal water deliveries.
The LRRP, as adopted by Council, has automatic water delivery reduction triggers
when Lopez reaches 15,000 Acre Foot (AF) and 10,000 AF of storage. The LRRP also
has an Adaptive Management mechanism to allow the San Luis Obispo County Flood
Control and Water District Zone 3 Technical Advisory Committee (TAC) to recommend
alterations to the automatic triggers based on atmospheric and storage projections.
At the TAC meeting on March 5, 2015, the City TAC representatives recommended
that the deliveries from the Water Treatment Plant be reduced by 10% starting April 1,
Item 11.b. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
MARCH 24, 2015
PAGE 2
2015. This is in advance of the Lake reaching 15,000 AF of storage, which is the
automatic reduction trigger. This request will be on the April 2, 2015 TAC meeting
agenda for consideration to bring the item to the Zone 3 Advisory Board meeting in
May. The potential for a 10% delivery supply. reduction for water year 2015/16 from
Lake Lopez is factored into the Arroyo Grande water supply projections being presented
to Council.
For the water year 2014/15, which ends March 31St, 2015, the City's water use is 9%
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 projected
Lopez supply for water year 2015/16 for Arroyo Grande is 2,960 AF, which includes 900
AF of carry-over water. Based on the projected water demand of 2,800 AF, we will be
able to meet the demand in water year 2015/16 with minimal groundwater pumping
without the imposition of emergency water use restrictions.
Ground water levels are up slightly from the same time last year, but the City has not
pumped any groundwater from the Santa Maria Groundwater Basin (SMGB) for potable
use since September 2014. Minimal pumping from the City's entitlement from the
SMGB is anticipated in water year 2015/16.
ALTERNATIVES:
Not applicable at this time.
ADVANTAGES:
No advantages noted at this time.
DISADVANTAGES:
No disadvantages noted 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, March 19, 2015. The Agenda
and staff report were posted on the City's website on Friday, March 20, 2015.
Attachments:
1. February 2015 Water Supply and Demand Charts
2. Lopez Reservoir Storage projections
Item 11.b. - Page 2
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