CC 2019-02-26_08i Water Supply and Demand Update_Jan 2019MEMORANDUM
TO: CITY COUNCIL
FROM: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: FEBRUARY 26, 2019
SUMMARY OF ACTION:
The update reports the water supply and demand for January 2019. 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On April 25, 2017, the City Council, by Resolution, rescinded the Stage 1 Water Shortage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 everyday water saving measures, and reiterated that the previously adopted
water conservation measures were to remain in effect.
In January 2019, the City’s water use was 127.4 acre-feet with a per capita use of 76
gallons per day/per person. There was a total of 5.1 inches of rainfall in January 2019.
The water use for the current “rolling” water year from February 2018 to January 2019
was 2,188 acre-feet, which equates to a per capita use of 111 gallons per day per person.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of February 14, 2019 shows San Luis Obispo
County as abnormally dry. Rainfall to date (July 1, 2018 to February 14, 2019) is 13.25
inches at the Arroyo Grande Creek rain gauge. Lopez Lake, as of February 14, 2019, is
at 46.1% capacity (22,752 acre-feet of storage). The Deep Well Index level on January
8, 2019 was 9.29 feet above sea level, which is 1.79 feet higher than the Deep Well Index
threshold value of 7.5 feet.
Item 8.i. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
FEBRUARY 26, 2019
PAGE 2
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.
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 January 2019
1.a. Lopez Monthly Operations Report for March 2018
2. Lopez Reservoir Storage Projection
3. Monthly Water Use Comparison
Item 8.i. - Page 2
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportJanuary, 2019257.77Note: 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.1848.70April to Present12.47Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)480.89Storage (full at 49200 acre feet)20119Rainfall7.45Downstream Release (4200 acre feet/year)213.9Spillage (acre feet)0This MonthYear to Date3464.770.00564.00127.44Entl.SurplusUsage2854.00TotalLopez Water Deliveries340.77Oceano CSD30375.000.00378.00681.96Grover Beach800197.0064.14997.001112.00Pismo Beach892220.000.001112.0067.97CSA 1224560.003.37305.0096.0760896.075.77975.770.0000.00State Water Deliveries4051.4045301116.00194.955646.00109.52825109.52Total ContractorDifference (feet)-41.48% Full40.9%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 1.10 AF delivered to Canyon Crest was added to Oceano's State Water usage this monthand 1.10 AF was subtracted from Arroyo Grande's usage this month.April to Present Lopez Entitlement+Surplus Water Usage050100150200250Apr'18May'18Jun'18Jul '18 Aug'18Sep'18Oct'18Nov'18Dec'18Jan'19Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage020406080100120Apr'18May'18Jun'18Jul'18Aug'18Sep'18Oct'18Nov'18Dec'18Jan'19Acre FeetOCSDPBCSA12SanMigSan Miguelito7.681207.68This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request127.44Total Water Deliveries This Month13.0164.1496.079.147.68317.48Annual Request0.00Usage13.010.000.000.00%0.0037.770.00220.000.001848.70303.00681.96892.0067.973793.6313.0162.00SWP DeliveriesSWP DeliveriesChange in Storage62-47.521340.00This Month Stored State Water23.1%5.6%64.8%0.0%90.2%8.0%68.4%0.0%100.0%1.4%22.3%15.8%15.8%5.9%5.9%0.0%0.0%4.3%71.8%13.3%13.3%6.4%6.4%0.0%17.3%0.0%0.0%0.0%0.0%50.4%0.0%100.0%0.0%80.7%100.0%85.2%100.0%27.7%83.7%1.2%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%1387.52Last Month Stored State WaterMonday, February 11, 2019Page 1 of 1Report printed by:AdminData entered by: D. SpiegelATTACHMENT 1Item 8.i. - Page 3I ........ -~ 1° • 0 0 • I 1° 0 • 0 I l I I I
ATTACHMENT 1a
Item 8.i. - Page 4
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LOPEZ RESERVOIR STORAGE PROJECTION
Actual Precipitation
Predicted Precipitation
Actual Storage
Predicted Storage
20,000 AF
Storage Projection
Note:
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 2
Item 8.i. - Page 5
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LOPEZ RESERVOIR STORAGE PROJECTION
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152.4127.49176020406080100120140160180Jan‐18 Jan‐19Monthly Water Use ComparisonAcre FeetUsage (gpcd)ATTACHMENT 3Item 8.i. - Page 6■ ■