CC 2018-08-28_09f Monthly Water Supply and Demand Update_July 2018
MEMORANDUM
TO: CITY COUNCIL
FROM: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: AUGUST 28, 2018
SUMMARY OF ACTION:
The update reports the water supply and demand for July 2018. 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 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On April 25, 2017, the City Council, by resolution, rescinded the Stage 1 Water Shortage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 along with related emergency 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 urged citizens to continue to
practice every day water saving measures, and reiterated that the previously adopted
water conservation measures were to remain in effect.
In July 2018, the City’s water use was 213.8 acre-feet with a per capita use of 127 gallons
per day/per person. There was a total of 0” of rainfall in July. The water use for the
current “rolling” water year from August 2017 to July 2018 was 2,288 acre-feet, which
equates to a per capita use of 116 gallons per day/per person.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of August 16, 2018 shows San Luis Obispo County
in a severe drought. Rain fall to date (July 1, 2018 to July 31, 2018) is 0 inches at the
Corporation Yard rain gauge. Lopez Lake, as of August 16, 2018, is at 45.7% capacity
(22,591 acre-feet of storage).
The new water year began on April 1, 2018 and the City’s current total available supply
from Lopez is 2,290 acre-feet, our normal entitlement plus 564 acre-feet of surplus water.
Item 9.f. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
AUGUST 28, 2018
PAGE 2
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.
The projected water use for water year 2018/19 is 2,000 acre-feet if the City receives
average rainfall.
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.
Attachments:
1. Lopez Monthly Operations Report for July 2018
1.a. Lopez Monthly Operations Report for March 2018
2. Lopez Reservoir Storage Projection
3. Monthly Water Use Comparison
Item 9.f. - Page 2
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ATTACHMENT 1a
Item 9.f. - Page 4
2.500.207.760.220.320.621.702.573.593.873.460.002.004.006.008.0010.0012.0014.000.05000.010000.015000.020000.025000.030000.035000.040000.01/1/20182/1/20183/1/20184/1/20185/1/20186/1/20187/1/20188/1/20189/1/201810/1/201811/1/201812/1/20181/1/20192/1/20193/1/2019Precipitation (in)Storage (AF)DateLOPEZ RESERVOIR STORAGE PROJECTIONActual PrecipitationPredicted PrecipitationActual StorageProjected Storage20,000 AFNote:1. Storage projection is based on predicted rainfall from longrangeweather.com,historic inflow based on predicted rainfall, 18‐19 downstream release requests, and municipal usage.2. Municipal Usage is based on 2010‐2017 average monthly deliveries.5 of 5ATTACHMENT 2Item 9.f. - Page 5
ATTACHMENT 3237.7213.8142127050100150200250Jul‐17 Jul‐18Monthly Water Use ComparisonAcre FeetUsage (gpcd)Item 9.f. - Page 6