CC 2020-10-27_08g Water Supply and Demand Update_September 2020
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: OCTOBER 27, 2020
SUMMARY OF ACTION:
This update reports the water supply and demand for September 2020. 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On April 25, 2017, the City Council, by resolution, rescinded the Stage 1 Water Shortage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 every-day water saving measures and reiterated that the previously-adopted
water saving measures were to remain in effect.
In September 2020, the City’s water use was 216.8 acre-feet with a per capita use of 134
gallons per day/per person. There was a total of 0.0 inches of rainfall in September 2020.
The water use for the current “rolling” water year from October 2019 to September 2020
was 2,270 acre-feet, which equates to a per capita use of 115 gallons per day/per person.
There was a total of 15.02 inches of rain fall for this period.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of October 8, 2020, shows San Luis Obispo
County as normal. Rainfall to date (July 1, 2020 to September 30, 2020) is 0.0 inches at
Item 8.g. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
OCTOBER 27, 2020
PAGE 2
the Corporation Yard rain gauge. Lopez Lake, as of October 13, 2020, is at 43.6%
capacity (21,511 acre-feet of storage).
The new water year began on April 1, 2020, and the current total available supply from
Lopez is 2,290 acre-feet, our normal entitlement. In addition, we have 1,323 acre-feet of
ground water entitlement from the Santa Maria Basin and 160 acre-feet from the Pismo
Formation. In addition, 111 acre-feet of surplus water from Lopez was requested. The
projected water use for 2020/21 is 2,300 acre-feet. In conclusion, based on average
rainfall for the next two years, the current supply will meet the projected demand.
ALTERNATIVES:
Not applicable at this time.
ADVANTAGES:
No advantages noted at this time.
DISADVANTAGES:
No disadvantages noted 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 September 2020
1a. Lopez Monthly Operations Report for March 2020
2. Lopez Reservoir Storage Projection
3. Monthly Water Use Comparison
4. Monitoring Report for September 2020
Item 8.g. - Page 2
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportSeptember, 20200.00Note: 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.1212.30April to Present0.06Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)484.21Storage (full at 49200 acre feet)21785Rainfall0Downstream Release (4200 acre feet/year)246.43Spillage (acre feet)0This MonthYear to Date1384.680.00911.00207.00Entl.Surplus Water DeclaredUsage2401.00Total Available WaterLopez Water Deliveries332.10Oceano CSD303121.0035.39624.00395.21Grover Beach800318.0065.00900.00525.86Pismo Beach892355.0094.521547.0086.01CSA 1224598.0012.98245.00534.2760870.0030.12403.4560.006030.00State Water Deliveries2551.4845301803.00414.895717.00730.18828113.14Total ContractorDifference (feet)-38.16% Full44.3%Comments:1) Oceano supplied water to Canyon Crest via Arroyo Grande's Edna turn out. A total of 2.38 AF delivered to Canyon Crest was added to Oceano's water usage this month and 2.38 AF was subtracted from Arroyo Grande's usage this month.2) OCSD revised their annual State Water Delivery Request on September 10th from 150 AF to 60 AF.April to Present Lopez Entitlement+Surplus Water Usage050100150200250Jan '20 Feb '20 Mar '20 Apr '20 May '20 Jun '20 Jul '20 Aug '20 Sep '20Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage020406080100120Jan '20 Feb '20 Mar '20 Apr '20 May '20 Jun '20 Jul '20 Aug '20 Sep '20Acre FeetOCSDPBCSA12SanMigSan Miguelito105.791209.69This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request207Total Water Deliveries This Month65.3965164.5216.439.69528.03Annual Request0.00Usage0.000.000.000.00%0.000.000.000.000.001212.30332.10395.21525.8686.012551.480.00621.00SWP DeliveriesSWP DeliveriesChange in Storage68-45.141347.07This Month Stored State Water0.0%9.0%50.5%11.7%53.2%8.1%43.9%10.6%34.0%5.3%35.1%11.5%87.9%8.6%75.3%50.0%100.0%9.2%44.6%13.7%88.2%8.1%88.2%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%52.9%109.6%49.4%59.0%35.1%56.3%0.0%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%1392.21Last Month Stored State WaterSurplus Requested111.00321.00100.00655.000.001187.00Tuesday, October 6, 2020Page 1 of 1Report printed by:AdminData entered by:D. BravoATTACHMENT 1Item 8.g. - 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.g. - Page 4
2.50
1.19
6.47
8.05
3.94
0.10
2.34
0.00 0.00 0.00 0.00 0.00
2.19
5.44
0.54
0.00
4.70
2.14
0.24 0.00 0.00 0.00
1.70
2.57
3.59 3.87
3.46
1.13
0.41 0.08 0.03 0.00 0.30 0.62
1.70
2.57
3.59 3.87
3.46
1.13
0.41 0.09 0.03 0.08 0.44
0.99
2.17
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
0.0
5000.0
10000.0
15000.0
20000.0
25000.0
30000.0
35000.0
40000.0
11/1/201812/1/20181/1/20192/1/20193/1/20194/1/20195/1/20196/1/20197/1/20198/1/20199/1/201910/1/201911/1/201912/1/20191/1/20202/1/20203/1/20204/1/20205/1/20206/1/20207/1/20208/1/20209/1/202010/1/202011/1/202012/1/2020Storage (AF)Date
LOPEZ RESERVOIR STORAGE PROJECTION
Actual Precipitation Predicted Precipitation Actual Storage Predicted Storage
20,000 AF Storage Projection Storage Projection (No Rain)
Note:
1. Storage projection is based on predicted rainfall from longrangeweather.com,
historic inflow based on predicted rainfall, 20-21 downstream release requests, and
municipal usage.
2. Municipal Usage is based on 2010-2017 average monthly deliveries.
ATTACHMENT 2
Item 8.g. - Page 5
230.1
216.8
142 134
0
50
100
150
200
250
Sep-19 Sep-20
Monthly Water Use Comparison
Acre Feet Usage (gpcd)
ATTACHMENT 3
Item 8.g. - Page 6
Thank you for your Monitoring Report. Below is the information you have submitted for
the month of September 2020. 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 0920
County/Counties San Luis Obispo
Water Shortage Contingency Plan 0
Water Shortage Level No
Population 17636
Total Potable Water Production 216.8 AF
Commercial Agricultural Water 0 AF
Residential Use Percentage 80%
CII Water 23.8 AF
Recycled Water 0 AF
Non-Revenue Water AF
Estimated R-GPCD 106.82
Qualification
State Water Resources Control Board Office of Research, Planning & Performance
ATTACHMENT 4
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