CC 2018-05-22_09g Monthly Water Supply and Demand Update_April 2018
MEMORANDUM
TO: CITY COUNCIL
FROM: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: MAY 22, 2018
SUMMARY OF ACTION:
The update reports the water supply and demand for April 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On April 25, 2017, the City Council, by resolution, rescinded the Stage 1 Water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 April 2018, the City’s water use was 161.2 acre-feet with a per capita use of 99
gallons per day/per person. There was a total of 0.5” of rainfall in April. The water use
for the current “rolling” water year from April 2017 to April 2018 was 2,458 acre-feet,
which equates to a per capita use of 124 gallons per day/per person. There was a total
of 10.23” of rain fall for this period.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of May 11, 2018 shows San Luis Obispo County
in a severe drought. Rain fall to date (July 1, 2017 to May 11, 2018) is 9.23 inches at
the Corporation Yard rain gauge. Lopez Lake, as of May 11, 2018, is at 51.5% capacity
(25,411 acre-feet of storage).
Item 9.g. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
MAY 22, 2018
PAGE 2
The new water year began on April 1, 2018 and the current total available supply from
Lopez is 2,290 acre-feet, our normal entitlement plus 564 acre-feet of surplus water. 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
2. Lopez Reservoir Storage Projection
Item 9.g. - Page 2
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportApril, 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.161.15April to Present13.24Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)491.07Storage (full at 49200 acre feet)25590Rainfall0.57Downstream Release (4200 acre feet/year)358.14Spillage (acre feet)0This MonthYear to Date358.140.00564.00161.15Entl.SurplusUsage2854.00TotalLopez Water Deliveries4.04Oceano CSD30375.004.04378.0059.99Grover Beach800197.0059.99997.0084.68Pismo Beach892220.0084.681112.004.13CSA 1224560.004.13305.0067.0060839.0022.34846.220.0000.00State Water Deliveries313.9945301116.00313.995646.00120.9481256.27Total ContractorDifference (feet)-31.30% Full52.0%Comments:Zone 3 is no longer operating under the LRRP as of March 31, 2018 per Resolution 2017-218.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 1.76 AF delivered to Canyon Crest was added to Oceano's State Water usage this monthand 1.76 AF was subtracted from Arroyo Grande's usage this month.April to Present Lopez Entitlement+Surplus Water Usage050100150200Jul '17 Aug'17Sep'17Oct'17Nov'17Dec'17Jan'18Feb'18Mar'18Apr'18Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage01020304050Jul'17Aug'17Sep'17Oct'17Nov'17Dec'17Jan'18Feb'18Mar'18Apr'18Acre FeetOCSDPBCSA12SanMigSan Miguelito31.6012011.05This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request161.15Total Water Deliveries This Month4.03559.99123.6810.3511.05370.26Annual Request0.00Usage0.000.000.000.00%0.000.000.000.000.00161.154.0459.9984.684.13313.990.00111.00SWP DeliveriesSWP DeliveriesChange in Storage1119.81This Month Stored State Water0.0%7.0%5.6%1.3%1.1%7.5%6.0%9.5%7.6%1.7%1.4%6.4%11.0%7.4%26.6%0.0%0.0%6.9%5.6%6.9%14.9%9.2%26.3%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%7.0%1.3%7.5%9.5%1.7%6.9%0.0%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%Last Month Stored State WaterMonday, May 7, 2018Page 1 of 1Report printed by:AdminData entered by: D. Spiegel3 of 6ATTACHMENT 1Item 9.g. - Page 3
2.591.813.6212.499.061.691.570.240.210.082.500.27.760.22024681012140.05,000.010,000.015,000.020,000.025,000.030,000.035,000.040,000.07/1/20168/1/20169/1/201610/1/201611/1/201612/1/20161/1/20172/1/20173/1/20174/1/20175/1/20176/1/20177/1/20178/1/20179/1/201710/1/201711/1/201712/1/20171/1/20182/1/20183/1/20184/1/20185/1/20186/1/20187/1/20188/1/20189/1/201810/1/201811/1/201812/1/20181/1/20192/1/20193/1/20194/1/20195/1/20196/1/2019Monthly Precipitation (in)Storage (AF)DateLOPEZ RESERVOIR STORAGE PROJECTIONActual PrecipitationActual StorageProjected Storage20,000 AFStorage w/o CarryoverNote: Storage Projection is based on Water Years 14/15 and 15/16 municipaland downstream releases, rainfall, and evaporation.LRRPTerminated4 of 6ATTACHMENT 2Item 9.g. - Page 4