CC 2021-08-24_08f Monthly Water Supply and Demand Update_July
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: AUGUST 24, 2021
SUMMARY OF ACTION:
The update reports the water supply and demand for July 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On April 25, 2017, the City Council, by Resolution, rescinded the Stage 1 Water Shortage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 response to Council discussion on April 27, 2021, staff has begun to provide notice to
customers in non-compliance of the mandatory water conservation measures by hanging
door tags. In addition, four social media posts have been posted to the City’s social media
channels reminding customers of the measures, and information is highlighted on the
City’s website. The City’s drought response team has continued to enhance public
awareness of the drought and has been preparing for upcoming water shortage
measures.
In July 2021, the City’s water use was 238.3 acre-feet with a per capita use of 142 gallons
per day/per person. There was no measurable rainfall in July 2021. The water use for
the current “rolling” water year from August 2020 to July 2021 was 2,417.6 acre-feet which
Item 8.f. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
AUGUST 24, 2021
PAGE 2
equates to a per capita use of 122 gallons per day per person. There was a total of 9.11
inches of rain fall for this period.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of August 12, 2021, shows San Luis Obispo
County in an extreme drought. Rainfall to date for the period July 1, 2021, through July
31, 2021, is 0.0 inches at the Corporation Yard rain gauge. Lopez Lake, as of August 12,
2021, is at 33.1% capacity (16,364 acre-feet of storage).
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 third quarter monitoring for the sentry wells was completed in July. The deep well
index was 7.25 feet above sea level, which is 0.25 feet lower than the deep well index
threshold value of 7.5 feet. This is 1.75 feet lower than the index value one year ago (9.0
feet). The projected water use for the City of Arroyo Grande for water year 2021/22 is
2,450 acre-feet based on current rainfall.
On July 13, 2021, the San Luis Obispo County Board of Supervisors (Board) declared a
local drought emergency. This action allows the Low Reservoir Response Plan (LRRP)
to be enacted by Board action. The scheduled date for this anticipated action is August
24, 2021. Once the LRRP is in effect, a 10% reduction in Lopez deliveries will occur.
This equates to 216,000 gallons per day. 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. In
preparation for this water shortage emergency, staff will plan to conduct a noticed public
hearing in accordance with the requirements of Water Code Section 350 et seq. to
consider a Resolution declaring a Stage 1 Water Shortage Emergency on September 28,
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.
Item 8.f. - Page 2
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
AUGUST 24, 2021
PAGE 3
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 July 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 July 2021
Item 8.f. - Page 3
Attachment 1Item 8.f. - Page 4
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 5
Attachment 2
Item 8.f. - Page 6
226.9238.3135142050100150200250300Jul‐20 Jul‐21Monthly Water Use ComparisonAcre FeetUsage (gpcd)Attachment 3Item 8.f. - Page 7
ATTACHMENT 4
Below is the information you have submitted for the month of July 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 7/21
County / Counties San Luis Obispo
Water Shortage Contingency Plan 0
Water Shortage Level No
Population 17636
Total Potable Water Production 238.3 AF
Commercial Agricultural Water 0 AF
Residential Use Percentage 80%
CII Water 26.2 AF
Recycled Water 0 AF
Non-revenue Water AF
Estimated R-GPCD 113.62
Qualification
State Water Resources Control Board Office of Research, Planning & Performance
Item 8.f. - Page 8