CC 2021-09-28_08h Monthly Water Supply and Demand Update
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: SEPTEMBER 28, 2021
SUMMARY OF ACTION:
Receive a report of the City’s water supply and demand for August 2021, including current
and projected Lopez Lake levels.
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On April 25, 2017, the City Council, by Resolution, rescinded the Stage 1 Water Shortage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, information is highlighted on the City’s
website, and message boards displaying conservation messaging have been placed at
various locations around the City. 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 August 2021, the City’s water use was 217.5 acre-feet with a per capita use of 130
gallons per day/per person. There was no measurable rainfall in August 2021. The water
Item 8.h. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
SEPTEMBER 28, 2021
PAGE 2
use for the current “rolling” water year from September 2020 to August 2021 was 2,392.9
acre-feet which equates to a per capita use of 121 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 September 15, 2021, shows San Luis Obispo
County in an extreme drought. Rainfall to date for the period July 1, 2021, through
September 15, 2021, is 0.0 inches at the Corporation Yard rain gauge. Lopez Lake, as of
September 15, 2021, is at 31.5% capacity (15,570 acre-feet of storage).
The new water began on April 1, 2021, and the City’s annual Lopez contract supply was
2,290 acre-feet. On August 24, 2021, the San Luis Obispo County Board of Supervisors
(Board) enacted the Low Reservoir Response Plan (LRRP) for Lopez Lake. On
September 8, 2021, the Zone III Technical Advisory Committee endorsed the action of
reducing contract deliveries by 10% even though the Lake is slightly above the 15,000
acre-feet level. The City began reducing the flow on September 1 5, 2021, to 1.9 million
gallons per day, compared to the normal flow of 2.2 million gallons per day. In addition,
the City has 1,323 acre-feet of ground water entitlement from the Santa Maria Basin, and
wells within the Pismo Formation that produce approximately 160 acre-feet per year. 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 and 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.
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 Ci ty’s website in accordance with
Government Code Section 54954.2.
Item 8.h. - Page 2
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
SEPTEMBER 28, 2021
PAGE 3
Attachments:
1. Lopez Monthly Operations Report for August 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 August 2021
Item 8.h. - Page 3
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportAugust, 20210.00Note: 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.1001.88April to Present0.04Arroyo Grande2061Lopez Dam OperationsLake Elevation (full at 522.37 feet)471.11Storage (full at 49200 acre feet)15838Rainfall0Downstream Release (4200 acre feet/year)386.07Spillage (acre feet)0This MonthYear to Date1276.720.00807.00196.24Entl.Surplus Water DeclaredUsage2868Total Available WaterLopez Water Deliveries0.00Oceano CSD272.7107.000.00380331.53Grover Beach720282.0065.02100246.13Pismo Beach802.8314.0024.20111737.71CSA 12220.586.007.59307785.661260160.0062.76969.50303.2464048.92State Water Deliveries1417.2540771596.00293.0556731243.552116231.13Total ContractorDifference (feet)-51.26% Full32.2%Comments:1) Oceano supplied water to Canyon Crest via Arroyo Grande's Edna turn out. A total of 2.27 AF delivered to Canyon Crest was added to Oceano's water usage this month and 2.27 AF was subtracted from Arroyo Grande's usage this month.2) On May 12, 2021 Pismo requested to take all SW for April 2021. On May 18th, PB's SW Delivery Request was changed to 1260 AF.3) Lopez Water Deliveries are now operated under the Low Reservoir Response Plan (LRRP). On August 24, 2021 BOS approved to reduce entitlements by 10% (retroactive to April 2021) in anticipation of reaching the 15,000 AF trigger of the LRRP. Entitlements shownrepresent a 10% reduction.Surplus water shown is actually "Carry Over" water as designated in the LRRP.April to Present Lopez Entitlement+Surplus Water Usage050100150200250Jan '21 Feb '21 Mar '21 Apr '21 May '21 Jun '21 Jul '21 Aug '21Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage020406080100120140160180200Jan '21 Feb '21 Mar '21 Apr '21 May '21 Jun '21 Jul '21 Aug '21Acre FeetOCSDPBCSA12SanMigSan Miguelito91.8912012.71This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request196.24Total Water Deliveries This Month48.9265.02184.217.0912.71524.18Annual Request0.00Usage0.000.000.000.00%0.000.000.000.000.001001.880.00331.5346.1337.711417.250.001064.00SWP DeliveriesSWP DeliveriesChange in Storage30472.871086.61This Month Stored State Water0.0%9.5%34.9%0.0%0.0%9.0%33.1%3.0%4.1%3.4%12.3%12.7%62.4%9.9%65.4%7.6%47.4%7.2%25.0%10.9%58.8%10.6%76.6%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%48.6%0.0%46.0%5.7%17.1%34.8%0.0%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%1013.74Last Month Stored State WaterSurplus Requested807.00107.00282.00314.0086.001596.00Friday, September 10, 2021Page 1 of 1Report printed by:AdminData entered by:D. BravoAttachment 1Item 8.h. - Page 4I I I I I t l~t_l_t~ I• • D D • I I□ 0 • D I I ----+---1 ---+---------ti I 1 1
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$ttachment.D.Item 8.h. - Page 5April to Present Lopez Entitlement+Surplus Water Usage Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar '19 '19 '19 '19 '19 '19 '19 '19 '19 '20 '20 '20 l■AG ■GB DOCSD □PB ■CSA12I I I I I I I January to Present State Water Usage !!o ::t============================================================:=rj=---. tw.1~ Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar '19 '19 '19 '19 '19 '19 '19 '19 '19 '20 '20 '20 l□OCSD □PB ■CSA12 OSanMlg I
5.44
0.54
0.00
4.70
2.14
0.24 0.00 0.00 0.00 0.00 0.000.52
1.42
5.16
0.22
0.94
0.00 0.00 0.00 0.00 0.00
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 0.32 0.62
1.70
2.24
3.12 2.98
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
1/1/20202/1/20203/1/20204/1/20205/1/20206/1/20207/1/20208/1/20209/1/202010/1/202011/1/202012/1/20201/1/20212/1/20213/1/20214/1/20215/1/20216/1/20217/1/20218/1/20219/1/202110/1/202111/1/202112/1/20211/1/20222/1/20223/1/2022Storage (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.
Attachment 2
Item 8.h. - Page 61/1/2020 2/1/2020 3/1/2020 4/1/2020 5/1/2020 6/1/2020 7/1/2020 8/1/202 9/1/202 10/1/202 11/1/202 12/1/202 ~ 1/1/202 ...... (1) 2/1/202 3/1/20 4/1/20 5/1/20 6/1/20 7/1/20 8/1/20 9/1/20 10/1/20 11/1/2 12/1/2 1/1/2 2/1/2 3/1/2 0 0 0 0 :j:,. 0 0 ~ ~ -0 0 ..... 0 0 ..... 0 00 0N 0 9 0 N 00 N 0 ,,:; -= 0 0 _9 0 ,_. 00 -;..... o-::i 00 -;..... ow 00 -:... oN 09 N 0 ;... N 9 cS 9 .i:,. V, 0 0 0 '" p, I-' ;::: ,_. w ,_. 0 N 0 0 N .i:,. N ._ w ~ .i:,. ,_. 0 0 0 0 N -.J !" () ~ -.J !-' " w V, N ,_ ,_. !" I.J !' oi .i:,. 0 0 ' I Storage (AF) I-' N V, 0 0 0 0 0 0 0 :E: I I ~ c I I !-" ~ a, J I I I I I l /4 I a, 0 0 I T N V, 0 0 0 ' I I I I 00 0 0 I ,_. 9 0 0 w 0 0 0 0 w V, 0 0 0 I I . N _o 0 0 l> I I V, 0 ..., QJ a.!:' -0 ~-n ~-0 :J I I V, .... 0 ;;-: Otl (I) ~ .:::. (I) ~. :J ? ;o QJ :J ,_. N 0 0 I ■ l> ~ .... QJ -~ n "'CJ ;;: .... a :J I I -0 (1) a. ~ a. -0 ~ n "'CJ a-· ..... 0 :J I I l> n .... C = V, .... 0 QJ Otl (I) .i:,. 0 0 0 0 ,_. .i:,. 0 0 ' 0 -0 m N :::0 m Vl m :::0 < 0 :::0 Vl d :::0 )> G) m -0 :::0 0 '--m n ~ 0 z
242.2
217.5
144
130
0
50
100
150
200
250
300
Aug‐20 Aug‐21
Monthly Water Use Comparison
Acre Feet Usage (gpcd)
Attachment 3
Item 8.h. - Page 7
■ ■
Attachment 4
Thank you for your Monitoring Report. Below is the information you have submitted for
the month of August 2021. If this information is incorrect, you can edit the 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 0821
County/Counties San Luis Obispo
County Under Drought Declaration Yes
Water Shortage Contingency Plan 0
Water Shortage Level No
Population 17636
Total Potable Water Production 217.5 AF
Commercial Agricultural Water 0 AF
Residential Use Percentage 80 %
CII Water 23.9 AF
Recycled Water 0 AF
Non-revenue Water AF
Estimated R-GPCD 103.71
Qualification
Emergency Response Section Revealed? Yes
State Water Resources Control Board Office of Research, Planning & Performance
Item 8.h. - Page 8