CC 2019-01-22_08k Calendar Year 2018 Water Supply and Demand UpdateMEMORANDUM
TO: CITY COUNCIL
FROM: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: CALENDAR YEAR 2018 WATER SUPPLY AND DEMAND UPDATE
DATE: JANUARY 22, 2019
SUMMARY OF ACTION:
The update reports the water supply and demand for Calendar Year 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 Calendar Year 2018 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On April 25, 2017, the City Council, by Resolution, rescinded the Stage 1 Water Shortage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 2018, the City’s water use was 2,212.5 acre-feet with a per capita use of 112 gallons
per day/per person. There was a total of 12.2 inches of rainfall in 2018.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of January 8, 2019 shows San Luis Obispo County
in a severe drought. Rainfall to date (July 1, 2018 to December 31, 2018) is 3.4 inches
at the Corporation Yard rain gauge. Lopez Lake, as of January 10, 2019, is at 39.6%
capacity (19,537 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.
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.
Item 8.k. - Page 1
CITY COUNCIL
CALENDAR YEAR 2018 WATER SUPPLY AND DEMAND UPDATE
JANUARY 22, 2019
PAGE 2
The projected water use for water year 2018/19 is 2,000 acre-feet if the City receives
average rainfall.
On November 14, 2018, Lopez Lake storage fell below 20,000 acre-feet. The City
requested a voluntary 10% flow reduction to conserve 175,000 gallons a day behind the
dam. No additional restrictions are placed on our customers with this flow reduction.
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 December 2018
1.a. Lopez Monthly Operations Report for March 2018
2. Lopez Reservoir Storage Projection
3. Yearly Water Use Comparison
Item 8.k. - Page 2
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportDecember, 2018244.76Note: 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.1721.26April to Present5.02Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)479.5Storage (full at 49200 acre feet)19457Rainfall1.29Downstream Release (4200 acre feet/year)320.08Spillage (acre feet)0This MonthYear to Date3250.870.00564.00147.05Entl.SurplusUsage2854.00TotalLopez Water Deliveries327.76Oceano CSD30375.001.60378.00617.82Grover Beach800197.0073.21997.001112.00Pismo Beach892220.000.001112.0064.60CSA 1224560.007.76305.00241.5020536.5081.8383.963.170.0000.00State Water Deliveries3843.4445301116.00229.625646.00434.23408.9648.50Total ContractorDifference (feet)-42.87% Full39.5%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 totalof 1.46 AF delivered to Canyon Crest was added to Oceano's State Water usage this monthand 1.46 AF was subtracted from Arroyo Grande's usage this month.April to Present Lopez Entitlement+Surplus Water Usage050100150200250Jan'18Feb'18Mar'18Apr'18May'18Jun'18Jul'18Aug'18Sep'18Oct'18Nov'18Dec'18Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage020406080Jan'18Feb'18Mar'18Apr'18May'18Jun'18Jul'18Aug'18Sep'18Oct'18Nov'18Dec'18Acre FeetOCSDPBCSA12SanMigSan Miguelito110.901208.83This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request147.05Total Water Deliveries This Month26.3673.21107.0910.938.83373.47Annual Request0.00Usage24.760.0070.590.00%0.0024.760.00220.000.001721.26303.00617.82892.0064.603598.6895.35692.00SWP DeliveriesSWP DeliveriesChange in Storage8233.501387.52This Month Stored State Water21.9%6.4%60.3%0.5%86.7%9.2%62.0%0.0%100.0%3.2%21.2%17.8%117.8%3.8%97.5%0.0%0.0%5.1%68.1%11.9%106.2%7.4%92.4%0.0%33.0%0.0%32.1%0.0%0.0%33.0%0.0%100.0%0.0%75.2%100.0%77.2%100.0%26.4%79.4%8.5%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%1354.02Last Month Stored State WaterTuesday, January 8, 2019Page 1 of 1Report printed by:AdminData entered by:D. BravoATTACHMENT 1Item 8.k. - Page 3l ... ~mn I r>o, E, I~. 1W. ll, il, il, "7, "7, rk 1□ ■ □ □ ■ 1□ □ ■ □ l I I I
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Item 8.k. - Page 4
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2.500.207.760.220.000.000.000.000.000.232.501.190.621.702.573.593.873.460.002.004.006.008.0010.0012.0014.000.05000.010000.015000.020000.025000.030000.035000.040000.01/1/20182/1/20183/1/20184/1/20185/1/20186/1/20187/1/20188/1/20189/1/201810/1/201811/1/201812/1/20181/1/20192/1/20193/1/2019Precipitation (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 8.k. - Page 5LOPEZ RESERVOIR STORAGE PROJECTION 4000 3500 3000 0 2500 0 I .,6 ----== ----....... 1500 1000 JU 0 500 170 0 ,2 .o ( 20 (22 ( 00 coo ( 00 ( 00 ( 00 (123 I II 11 ,..; 0 0 .... ~ ~ ~ ~ ~ .... 0 0 0 0 0 0 0 0 0 N N N N N N N N N N N ::.-::.-..... ::.-::.-::.-::.-::.-::.-::.-..... .... rl ::.-..... ..... ..... ..... ..... ..... ------cl" ..... N "' .,. "' "' ,.._ IXJ "' .... .... .... Date -• t -•Predc1 d Pree -,. --~Pro1ected Stor -~ 20,0 AF -3 87 3 59 2.57 . .... ~ ~ 0 0 0 N N N ::.-::.-::.-..... ::.----~ N 1 3 46 ~ 0 N ::.----"' 00 .2 :>O 00 g C: 0 ;; ~ a u ., 6. J ~ 4 J
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2017 2018
Yearly Water Use Comparison
Acre Feet Usage (gpcd)
ATTACHMENT 3
Item 8.k. - Page 6
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