CC 2021-02-23_08f Monthly Water Supply and Demand Update_January
MEMORANDUM
TO: CITY COUNCIL
FROM: BILL ROBESON, PUBLIC WORKS DIRECTOR
BY: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: FEBRUARY 23, 2021
SUMMARY OF ACTION:
The update reports the water supply and demand for January 2021. 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On April 25, 2017, the City Council, by Resolution, rescinded the Stage 1 Water Shortage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 that public meeting, Council requested that staff continue preparing the monthly
water supply and demand updates. 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 2021, the City’s water use was 165.1 acre-feet with a per capita use of 98
gallons per day/per person. There was a total of 5.75 inches of rainfall in January 2021.
The water use for the current “rolling” water year from February 2020 to January 2021
was 2,347.9 acre-feet which equates to a per capita use of 119 gallons per day per
person. There was a total of 15.57 inches of rain fall for this period.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of February 10, 2021, shows San Luis Obispo
County as abnormally dry. Rainfall to date for the period July 1, 2020, through January
31, 2021, is 7.65 inches at the Corporation Yard rain gauge. Lopez Lake, as of February
10, 2021, is at 40.2% capacity (19,860 acre-feet of storage).
Item 8.f. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
FEBRUARY 23, 2021
PAGE 2
The new water year began on April 1, 2020, and the City’s current total available supply
from Lopez is 2,290 acre-feet. In addition, the City has 1,323 acre-feet of ground water
entitlement from the Santa Maria Basin, 200 acre-feet from the Pismo Formation, and an
additional 111 acre-feet of surplus Lopez water. The projected water use for water year
2020/21 is 2,375 acre-feet based on current 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 2021
1.a. Lopez Monthly Operations Report for March 2020
2. Lopez Reservoir Storage Projection
3. Monthly Water Use Comparison
4. Monthly Monitoring Report for January 2021
Item 8.f. - Page 2
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportJanuary, 2021292.96Note: 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.1952.13April to Present9.20Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)480.38Storage (full at 49200 acre feet)19874Rainfall6.81Downstream Release (4200 acre feet/year)306.58Spillage (acre feet)0This MonthYear to Date2593.520.00911.00161.42Entl.Surplus Water DeclaredUsage2401.00Total Available WaterLopez Water Deliveries566.68Oceano CSD303121.000.00624.00661.09Grover Beach800318.0069.09900.00921.28Pismo Beach892355.0097.151547.00113.43CSA 1224598.004.22245.000.00250.006.13966.130.0000.00State Water Deliveries4214.6145301803.00331.885717.0010.5924110.59Total ContractorDifference (feet)-41.99% Full40.4%Comments:1) Oceano supplied water to Canyon Crest via Arroyo Grande's Edna turn out. A total of 1.86 AF delivered to Canyon Crest was added to Oceano's water usage this month and 1.86 AF was subtracted from Arroyo Grande's usage this month.April to Present Lopez Entitlement+Surplus Water Usage050100150200250Apr '20 May '20 Jun '20 Jul '20 Aug '20 Sep '20 Oct '20 Nov '20 Dec '20 Jan '21Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage01234567Apr '20 May '20 Jun '20 Jul '20 Aug '20 Sep '20 Oct '20 Nov '20 Dec '20 Jan '21Acre FeetOCSDPBCSA12SanMigSan Miguelito4.461204.46This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request161.42Total Water Deliveries This Month55.4869.09126.4310.354.46427.23Annual Request0.00Usage55.480.0029.280.00%0.00263.680.0029.280.001952.13303.00661.09892.00113.433921.6584.7674.00SWP DeliveriesSWP DeliveriesChange in Storage7463.411371.08This Month Stored State Water24.7%7.0%81.3%0.0%90.8%8.6%73.5%10.9%59.6%1.7%46.3%0.0%0.0%6.4%6.4%0.0%0.0%7.3%73.7%4.4%4.4%3.7%3.7%0.0%17.3%0.0%4.5%0.0%0.0%82.1%0.0%4.5%0.0%85.2%100.0%82.6%100.0%46.3%86.6%7.1%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%1307.67Last Month Stored State WaterSurplus Requested111.00321.00100.00655.000.001187.00Monday, February 8, 2021Page 1 of 1Report printed by:AdminData entered by:D.BravoATTACHMENT 1Item 8.f. - Page 3
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportMarch, 2020727.00Note: 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.2122.35April to Present14.31Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)490.87Storage (full at 49200 acre feet)25472Rainfall5.37Downstream Release (4200 acre feet/year)207.46Spillage (acre feet)0This MonthYear to Date2736.220.00378.00139.74Entl.Surplus Water DeclaredUsage2290.00Total Available WaterLopez Water Deliveries624.35Oceano CSD30350.000.00624.35787.22Grover Beach800132.0064.00820.001297.65Pismo Beach892147.000.001297.6586.34CSA 1224540.007.19245.0097.27112023.845.92272.040.002270.00State Water Deliveries4917.914530747.00210.935277.00132.28150135.14Total ContractorDifference (feet)-31.50% Full51.8%Comments:Available Surplus Water is shown and as designated per BOS May 14, 2019 Declaration of Surplus Water. Beginning with July 2019 report, Surplus Water Requested is amount purchased by each agency. Surplus Water used is based on Surplus Water Requested. 1) Oceano supplied water to Canyon Crest via Arroyo Grande's Edna turn out. A total of 1.5 AF delivered to Canyon Crest wasadded to Oceano's water usage this month and 1.5 AF was subtracted from Arroyo Grande's usage this month.On 2/7/2020 Pismo requested the remaining 127 AF of surplus water (SurW) in addition up to 90 AF of Oceano’s SurW if needed for March, 2020. In March, Pismo used 78.65 AF of Oceano's remaining SurW. Pismo Surplus = 200 AF (original) + 127AF (Total remaining SurW) + 78.65 (Oceano's remaining SurW Requested) = 405.65 AF.San Miguelito29.091279.26This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request139.74Total Water Deliveries This Month48.0764102.499.239.26372.79Annual Request0.00Usage48.070.0078.650.00%0.00321.350.00405.650.002122.35303.00787.22892.0086.344190.91126.72136.00SWP DeliveriesSWP DeliveriesChange in Storage1459.97This Month Stored State Water97.3%6.1%92.7%0.0%100.0%8.0%96.0%0.0%100.0%2.9%35.2%2.1%8.7%7.6%21.9%0.0%0.0%4.7%93.2%2.3%8.8%7.3%22.9%0.0%15.0%0.0%19.4%0.0%0.0%100.0%0.0%100.0%0.0%92.7%100.0%98.4%100.0%35.2%92.5%17.0%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%Last Month Stored State WaterSurplus Requested0.00321.3520.00405.650.00747.00Friday, April 3, 2020Page 1 of 1Report printed by:AdminData entered by:D. Bravo$77$&+0(17DItem 8.f. - Page 4
5.44
0.54
0.00
4.70
2.14
0.24 0.00 0.00 0.00 0.00 0.00 0.52
1.42
5.16
3.59 3.87 3.46
1.13
0.41 0.44
0.99
2.17
3.61
4.35 4.15
3.20
1.41
0.07 0.07 0.04
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
0
5000
10000
15000
20000
25000
30000
35000
40000
1/1/20202/1/20203/1/20204/1/20205/1/20206/1/20207/1/20208/1/20209/1/202010/1/202011/1/202012/1/20201/1/20212/1/20213/1/20214/1/20215/1/20216/1/20217/1/20218/1/2021Storage (AF)Date
LOPEZ RESERVOIR STORAGE PROJECTION
Actual Precipitation Predicted Precipitation Actual Storage
20,000 AF Storage Projection Storage Projection (No Rain)
1. Storage projection is based on predicted rainfall from longrangeweather.com, inflow based on predicted rainfall, 20-21 downstream release requests, and municipal usage.
2. Municipal Usage is based on Jan 2010-Dec 2019 average monthly deliveries.
3. Predicted inflow is based off of historical precipitation and storage data. Antecedant moisture conditions are factored into the model.The first rainstorms after months without
rain will cause less inflow than rainstorms during the rainy season. If the average daily rainfall for the previous three months is below 1 inch the model will multiply the predicted
inflow by 0.1, if the average is above 1 inch the inflow is multiplied by 1.25.
ATTACHMENT 2
Item 8.f. - Page 5
135.9165.18198020406080100120140160180Jan‐20Jan‐21Monthly Water Use ComparisonAcre FeetUsage (gpcd)ATTACHMENT 3Item 8.f. - Page 6
Thank you for your Monitoring Report. Below is the information you have submitted for
the month of January 2021. If this information is incorrect, you can edit the report or re-
submit your report for the month with the corrected information. We use your most
recently submitted monthly report in our calculations.
Reporter Shane Taylor
Urban Water Supplier (Number) Arroyo Grande City of (608)
Public Water System ID(s) CA4010001
Reporting Month 01/21
County / Counties San Luis Obispo
Water Shortage Contingency Plan 0
Water Shortage Level No
Population 17636
Total Potable Water Production 165.1 AF
Commercial Agricultural Water 0 AF
Residential Use Percentage 80%
CII Water 18.2 AF
Recycled Water 0 AF
Non-revenue Water AF
Estimated R-GPCD 78.72
Qualification
State Water Resources Control Board Office of Research, Planning & Performance
ATTACHMENT 4
Item 8.f. - Page 7
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Item 8.f. - Page 8