CC 2018-06-26_09f Monthly Water Supply and Demand Update
MEMORANDUM
TO: CITY COUNCIL
FROM: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: JUNE 26, 2018
SUMMARY OF ACTION:
The update reports the water supply and demand for May 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On April 25, 2017, the City Council, by resolution, rescinded the Stage 1 Water Shortage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 May 2018, the City’s water use was 202.9 acre-feet with a per capita use of 121 gallons
per day/per person. There was a total of 0” of rainfall in May. The water use for the
current “rolling” water year from June 2017 to May 2018 was 2,305 acre-feet, which
equates to a per capita use of 117 gallons per day/per person.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of June 12, 2018 shows San Luis Obispo County
in a severe drought. Rain fall to date (July 1, 2017 to June 12, 2018) is 9.23 inches at
the Corporation Yard rain gauge. Lopez Lake, as of June 14, 2018, is at 49.8% capacity
(24,608 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
JUNE 26, 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 May 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
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportMay, 20180.00Note: Deliveries are in acre feet. One acre foot = 325, 850 gallons or 43, 560 cubic feet. Safe yield is 8,730 acre feet."Year to Date" is January to present for State water, April to present for Lopez deliveries, and July to present for rainfall.362.76April to Present13.26Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)490.09Storage (full at 49200 acre feet)25016Rainfall0.02Downstream Release (4200 acre feet/year)246.74Spillage (acre feet)0This MonthYear to Date604.880.00564.00201.61Entl.SurplusUsage2854.00TotalLopez Water Deliveries86.53Oceano CSD30375.0046.18378.00124.50Grover Beach800197.0064.51997.00165.81Pismo Beach892220.0081.131112.0011.99CSA 1224560.007.86305.00135.00112068.0028.56276.220.002270.00State Water Deliveries751.5945301116.00401.295646.00203.05150182.11Total ContractorDifference (feet)-32.28% Full50.8%Comments:Surplus water shown is as designated per BOS May 15, 2018 Declaration of Surplus Water.1) Oceano supplied State Water to Canyon Crest via Arroyo Grande's Edna turn out. A total of 2.20 AF delivered to Canyon Crest was added to Oceano's State Water usage this monthand 2.20 AF was subtracted from Arroyo Grande's usage this month.April to Present Lopez Entitlement+Surplus Water Usage050100150200250Jul'17Aug'17Sep'17Oct'17Nov'17Dec'17Jan'18Feb'18Mar'18Apr'18May'18Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage020406080Jul'17Aug'17Sep'17Oct'17Nov'17Dec'17Jan'18Feb'18Mar'18Apr'18May'18Acre FeetOCSDPBCSA12SanMigSan Miguelito39.491277.89This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request201.61Total Water Deliveries This Month46.1864.51149.1314.087.89483.40Annual Request0.00Usage0.000.000.000.00%0.000.000.000.000.00362.7686.53124.50165.8111.99751.590.00241.00SWP DeliveriesSWP DeliveriesChange in Storage66-16.111167.70This Month Stored State Water0.0%8.8%12.7%15.2%22.9%8.1%12.5%9.1%14.9%3.2%3.9%6.1%12.1%23.0%105.8%0.0%0.0%8.9%13.3%5.5%13.5%6.2%31.1%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%15.8%28.6%15.6%18.6%4.9%16.6%0.0%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%1183.81Last Month Stored State WaterWednesday, June 6, 2018Page 1 of 1Report printed by:AdminData entered by: D. Spiegel5 of 7ATTACHMENT 1Item 9.f. - Page 3
ATTACHMENT 1a
Item 9.f. - Page 4
2.500.207.760.220.060.320.621.702.573.593.873.460.002.004.006.008.0010.0012.0014.000.05000.010000.015000.020000.025000.030000.035000.040000.01/1/20182/1/20183/1/20184/1/20185/1/20186/1/20187/1/20188/1/20189/1/201810/1/201811/1/201812/1/20181/1/20192/1/20193/1/2019Precipitation (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.ATTACHMENT 2Item 9.f. - Page 5
196.7202.9117121050100150200250May 2017 May 2018Monthly Water Use ComparisonAcre FeetUsage (gpcd)ATTACHMENT 3Item 9.f. - Page 6