CC 2021-04-27_08i Monthly Water Supply and Demand Update_March
MEMORANDUM
TO: CITY COUNCIL
FROM: BILL ROBESON, ASSISTANT CITY MANAGER/PUBLIC WORKS
DIRECTOR
BY: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: APRIL 27, 2021
SUMMARY OF ACTION:
The update reports the water supply and demand for March 2021. Current Lopez Lake
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On April 25, 2017, the City Council, by Resolution, rescinded the Stage 1 Water Shortage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 March 2021, the City’s water use was 180.9 acre-feet with a per capita use of 108
gallons per day/per person. There was a total of 1.11 inches of rainfall in March 2021.
The water use for the current “rolling” water year from April 2020 to March 2021 was
2,360.0 acre-feet which equates to a per capita use of 119 gallons per day per person.
There was a total of 11.18 inches of rain fall for this period.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of April 15, 2021, shows San Luis Obispo County
in a moderate drought. Rainfall to date for the period July 1, 2020, through April 15, 2021,
is 9.11 inches at the Corporation Yard rain gauge. Lopez Lake, as of April 15, 2021, is at
38.6% capacity (19,070 acre-feet of storage).
Item 8.i. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
APRIL 27, 2021
PAGE 2
The new water year began on April 1, 2021, 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, and 160 acre-feet from the Pismo Formation.
The projected water use for water year 2021/22 is 2,450 acre-feet based on current
rainfall.
The State Water Resources Control Board, on March 22, 2021, issued a letter stating that
95% of California is experiencing Moderate to Exceptional Drought. Hydrological
conditions since 2020 have been very similar to the drought years of 2014 and 2015. The
County Flood Control & Water Conservation District has not declared a water shortage
emergency or enacted the Low Reservoir Response Plan. County staff is awaiting an
action from the State, such as a Statewide Emergency Declaration. Per the City of Arroyo
Grande Municipal Code Section 13.07.030, a Stage 1 water shortage emergency may be
implemented with the triggering condition of Lopez Reservoir reaching or falling below
15,000 acre-feet. The current Lopez Reservoir Storage Projection shows the 15,000
acre-feet storage level is anticipated to occur on October 1, 2021.
ADVANTAGES:
This report provides the City Council and the public with the current and projected
conditions of our water supply and demand.
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 March 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 March 2021
5. Letter from the State Water Resources Control Board dated 3-22-2021
Item 8.i. - Page 2
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportMarch, 2021633.98Note: 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.2277.86April to Present11.30Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)479.16Storage (full at 49200 acre feet)19297Rainfall1.79Downstream Release (4200 acre feet/year)57.6Spillage (acre feet)0This MonthYear to Date2760.820.00911.00178.85Entl.Surplus Water DeclaredUsage2401.00Total Available WaterLopez Water Deliveries673.74Oceano CSD303121.000.00674.00787.96Grover Beach800318.0066.54900.001155.24Pismo Beach892355.000.001497.00111.83CSA 1224598.004.98245.000.00250.0019.37967.280.0000.00State Water Deliveries5006.6345301803.00250.375717.0043.2824120.11Total ContractorDifference (feet)-43.21% Full39.2%Comments:1) Oceano supplied water to Canyon Crest via Arroyo Grande's Edna turn out. A total of 1.69 AF delivered to Canyon Crest was added to Oceano's water usage this month and 1.69 AF was subtracted from Arroyo Grande's usage this month.2) OCSD revised their annual State Water Delivery Request on September 10th 2020 from 150 AF to 60 AF.3) In February 2021 Pismo granted 50AF of its surplus water to OCSD. Pismo's Surplus Water Requested was adjusted from 655 AF to 605 AF and OCSD's Surplus Water Request was adjusted from 321 AF to 371 AF.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 '21 Feb '21 Mar '21Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage02468101214Apr '20 May '20 Jun '20 Jul '20 Aug '20 Sep '20 Oct '20 Nov '20 Dec '20 Jan '21 Feb '21 Mar '21Acre FeetOCSDPBCSA12SanMigSan Miguelito23.9112012.83This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request178.85Total Water Deliveries This Month58.5766.5499.612.2612.83428.65Annual Request0.00Usage58.570.0099.600.00%0.00370.740.00263.240.002277.86303.00787.96892.00111.834372.65158.17218.00SWP DeliveriesSWP DeliveriesChange in Storage7655.891482.39This Month Stored State Water53.4%7.8%94.9%0.0%100.0%8.3%87.6%0.0%77.2%2.0%45.6%0.0%0.0%7.6%20.2%0.0%0.0%5.5%87.6%8.3%18.0%10.7%19.9%0.0%15.8%0.0%16.5%0.0%0.0%99.9%0.0%43.5%0.0%99.5%100.0%98.5%100.0%45.6%96.5%13.3%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%1426.5Last Month Stored State WaterSurplus Requested111.00371.00100.00605.000.001187.00Wednesday, April 7, 2021Page 1 of 1Report printed by:AdminData entered by:D. BravoPage 4 of 16Attachment 1Item 8.i. - 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.i. - 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
0.22 0.94
2.87 3.10 2.77
0.90
0.33 0.32 0.62
1.34
2.03
3.02 3.25 2.91
1.13
0.41 0.07 0.03 0.02 0.28 0.52
1.84
2.90
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
1/1/20202/1/20203/1/20204/1/20205/1/20206/1/20207/1/20208/1/20209/1/202010/1/202011/1/202012/1/20201/1/20212/1/20213/1/20214/1/20215/1/20216/1/20217/1/20218/1/20219/1/202110/1/202111/1/202112/1/20211/1/2022Storage (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 2020 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.
Page 5 of 16
Attachment 2
Item 8.i. - Page 5
139.7180.983108020406080100120140160180200Mar‐20 Mar‐21Monthly Water Use ComparisonAcre FeetUsage (gpcd)Attachment 3Item 8.i. - Page 6
ATTACHMENT 4
Below is the information you have submitted for the month of March 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 3/21
County / Counties San Luis Obispo
Water Shortage Contingency Plan 0
Water Shortage Level No
Population 17636
Total Potable Water Production 180.9 AF
Commercial Agricultural Water 0 AF
Residential Use Percentage 80%
CII Water 19.9 AF
Recycled Water 0 AF
Non-revenue Water AF
Estimated R-GPCD 86.26
Qualification
State Water Resources Control Board Office of Research, Planning & Performance
Item 8.i. - Page 7
State Water Resources Control Board
March 22, 2021
ONGOING DRY CONDITIONS IN MOST CALIFORNIA WATERSHEDS – PREPARE
FOR DROUGHT IMPACTS STATEWIDE
After two years of low precipitation, the U.S. Drought Monitor now reports that
95 percent of California is experiencing Moderate to Exceptional Drought. Reservoir and
groundwater levels are significantly below average, and despite recent storms,
snowpack is only 58 percent of average as of March 10, 2021. Continued dry conditions
can threaten water supplies, impair critical habitat, reduce recreational opportunities,
and create uncertainty for all water users. Hydrologic conditions since 2020 have been
very similar to the drought years of 2014 and 2015.
Your early efforts can help minimize the potential impact of water management actions
on businesses, homes, farms, and California’s public trust resources. Start planning
now for potential water supply shortages later this year and identify practical actions you
can take to increase drought resilience, such as increasing water conservation
measures, reducing irrigated acreage, managing herd size, using innovative irrigation
and monitoring technologies, or diversifying your water supply portfolio.
The Division of Water Rights (Division) relies on accurate and timely water use data
from you and other diverters to help manage California’s water. All diverters must
report their annual water use, and many diverters must report diversion metering or
measuring data. By accurately reporting your water diversion and use data on time, you
fulfill your legal reporting obligation and provide critically important information for
managing the state’s water resources.
The Division is monitoring the situation closely and plans to engage more
frequently with water users if dry conditions continue or worsen. We encourage you
to work collaboratively with your community to develop cooperative water
management solutions that meet both local and state-level needs.
More information on Drought Conditions can be found
at: https://www.drought.gov/drought-status-updates/drought-status-update-california-
nevada
More information about the Division of Water Rights can be found
at: https://www.waterboards.ca.gov/waterrights/
Page 7 of 16
Attachment 5
Item 8.i. - Page 8