CC 2017-11-28_09g Monthly Water Supply and Demand Update_Oct 2017
MEMORANDUM
TO: CITY COUNCIL
FROM: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: NOVEMBER 28, 2017
SUMMARY OF ACTION:
This update reports the water supply and demand for October 2017. Current Lopez
Reservoir level and projected levels are provided in the attachments.
IMPACT ON FINANCIAL AND PERSONNEL RESOURCES:
Approximately two (2) hours of staff time is required to prepare the monthly report.
RECOMMENDATION:
It is recommended the City Council receive and file the monthly Water Supply and
Demand Report.
BACKGROUND:
On April 25, 2017, the City Council, by resolution, rescinded the Stage 1 Water
Shortage Emergency and related water conservation measures and restrictions. During
the public hearing the City Council requested staff to continue preparing the monthly
water supply and demand updates. The Council also urged citizens to remain
cognizant of how they use water, and reminded them that the previously adopted water
saving measures are still in effect.
In October, the City’s water use was 15% below October 2013. The State’s previously
mandated water use reduction was based on the 2013 water usage. There is currently
no required reduction imposed by the State Water Resources Control Board. The City
however, is still required to report monthly statistics to the State. As a comparison for a
single month, water usage statistics were 28% higher in October 2017 than October
2016.
ANALYSIS OF ISSUES:
The United States Department of Agriculture (USDA) Drought Monitor, as of November
7, 2017 shows San Luis Obispo County in a moderate drought. Rain fall to date (July 1,
2017 to October 31, 2017) is 0.25 inches at the Corporation Yard gauge. Lopez Lake,
as of November 14, 2017 is at 53.5% capacity (26,439 acre-feet of storage).
Item 9.g. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
NOVEMBER 28, 2017
PAGE 2
At the County of San Luis Obispo Board of Supervisors meeting on May 23, 2017, the
Board rescinded the drought emergency proclamation. However, as recommended by
Zone 3 Advisory Board, the Board of Supervisors kept the Low Reservoir Response
Plan in place. This will allow carryover water to be available until March 30, 2018 to all
contractors. The new water year began on April 1, 2017 and the current total available
supply from Lopez is 2,290 acre-feet, our normal entitlement, plus 1,249 acre-feet of
carryover. In addition we have 1,323 acre-feet of ground water entitlement from the
Santa Maria Basin and 200 acre-feet from the Pismo Formation.
Based on the projected water use of 2,500 acre-feet, we will meet the demand in water
year 2017/18, using only 50% of current supply.
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 at City Hall and on the City’s website in accordance with
Government Code Section 54954.2.
Attachment:
1. Lopez Reservoir Storage Projections
2. Zone 3 – Lopez Project – Monthly Operations Report
Item 9.g. - Page 2
4.160.582.591.813.6214.439.061.691.570.24#N/A1.482.112.762.982.910.002.004.006.008.0010.0012.0014.0016.0018.0020.004,0009,00014,00019,00024,00029,00034,00039,00044,00049,0003/14/20164/14/20165/14/20166/14/20167/14/20168/14/20169/14/201610/14/201611/14/201612/14/20161/14/20172/14/20173/14/20174/14/20175/14/20176/14/20177/14/20178/14/20179/14/201710/14/201711/14/201712/14/20171/14/20182/14/20183/14/2018Monthly Precipitation (in)Storage(AF)Notes:• For "Dry Months" (April ‐ October), projected increases and/or decreases in storage estimated to mimic conditions from 2015.• For "Wet Months" (November ‐ March), projected storage declines assume LRRP annual downstream release of 3,800 AFY and deLopez Reservoir Storage Projections(precipitation scenario source: www.LongRangeWeather.com)Actual PrecipitationProjected PrecipitationActual StorageProjected StorageStorage Without Carryover20,000 AFATTACHMENT 1Item 9.g. - Page 3
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