CC 2020-02-25_08g Monthly Water Supply and Demand Update_JanuaryMEMORANDUM
TO: CITY COUNCIL
FROM: BILL ROBESON, PUBLIC WORKS DIRECTOR
BY: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: FEBRUARY 25, 2020
SUMMARY OF ACTION:
The update reports the water supply and demand for January 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On April 25, 2017, the City Council, by resolution, rescinded the Stage 1 Water Shortage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 January 2020, the City’s water use was 135.9 acre-feet with a per capita use of 81
gallons per day/per person. There was a total of 0.6” of rainfall in January 2020. The
water use for the current “rolling” water year from February 2019 to January 2020 was
2,146 acre-feet, which equates to a per capita use of 109 gallons per day/per person.
There was a total of 18.0” of rain fall for this period.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of February 13, 2020 shows San Luis Obispo
County in an abnormally dry condition. Rainfall to date (July 1, 2018 to January 31, 2020)
is 7.1 inches at the Corporation Yard rain gauge. Lopez Lake, as of February 13, 2020
is at 51.5% capacity (25,417 acre-feet of storage).
Item 8.g. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
FEBRUARY 25, 2020
PAGE 2
The new water year began on April 1, 2019 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 200 acre-feet from the Pismo
Formation. The projected water use for 2019/20 is 2,200 acre-feet. In conclusion, based
on average rainfall for the next two years, the current supply will meet the projected
demand.
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.
Attachment:
1. Lopez Monthly Operations Report for January 2020
1a. Lopez Monthly Operations Report for August 2019
2. Lopez Reservoir Storage Projection
3. Monthly Water Use Comparison
Item 8.g. - Page 2
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportJanuary, 2020474.89Note: 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.1807.17April to Present8.94Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)490.96Storage (full at 49200 acre feet)25525Rainfall0.58Downstream Release (4200 acre feet/year)268.22Spillage (acre feet)0This MonthYear to Date2333.580.00378.00135.90Entl.Surplus Water DeclaredUsage2668.00Total Available WaterLopez Water Deliveries521.80Oceano CSD30350.000.00353.00655.89Grover Beach800132.0065.59932.001148.09Pismo Beach892147.000.001039.0068.39CSA 1224540.008.57285.009.0011209.001.82271.820.002270.00State Water Deliveries4201.344530747.00210.065277.0018.75150118.75Total ContractorDifference (feet)-31.41% Full51.9%Comments:Available Surplus Water is shown and as designated per BOS May 14, 2019 Declaration of Surplus Water. Beginning with July report, Surplus water shown will be amount purchased by each agency.1) Oceano supplied water to Canyon Crest via Arroyo Grande's Edna turn out. A total of 1.3AF delivered to Canyon Crest was added to Oceano's water usage this month and 1.3 AF was subtracted from Arroyo Grande's usage this month.Surplus water calculations are based on "Surplus Requested" not "Surplus Water Declared"April to Present Lopez Entitlement+Surplus Water Usage050100150200250Apr'19May'19Jun'19Jul '19 Aug'19Sep'19Oct'19Nov'19Dec'19Jan'20Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage0246810Apr'19May'19Jun'19Jul'19Aug'19Sep'19Oct'19Nov'19Dec'19Jan'20Acre FeetOCSDPBCSA12SanMigSan Miguelito7.931277.93This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request135.9Total Water Deliveries This Month50.5465.59109.2210.397.93379.57Annual Request0.00Usage50.540.00100.220.00%0.00218.800.00256.090.001807.17303.00655.89892.0068.393726.45150.760.00SWPDeliveriesSWPDeliveriesChange in Storage1437.50This Month Stored State Water76.6%5.9%78.9%0.0%74.2%8.2%80.0%0.0%105.1%3.5%27.9%0.8%0.8%6.7%6.7%0.0%0.0%4.6%81.6%1.2%1.2%6.2%6.2%0.0%12.6%0.0%50.1%0.0%0.0%54.7%0.0%128.0%0.0%78.9%100.0%82.0%100.0%27.9%82.3%24.3%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%Last Month Stored State WaterSurplus Requested0.00400.0020.00200.000.00620.00Tuesday, February 4, 2020Page 1 of 1Report printed by:AdminData entered by:D. BravoATTACHMENT 1Item 8.g. - Page 3I I I I ~~E I ........ 00 I• • 0 0 • I 1° 0 • 0 I I I I
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportAugust, 20190.00Note: 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.945.36April to Present0.00Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)494.42Storage (full at 49200 acre feet)27626Rainfall0Downstream Release (4200 acre feet/year)237.22Spillage (acre feet)0This MonthYear to Date986.640.00378.00189.73Entl.Surplus Water DeclaredUsage2668.00TotalLopez Water Deliveries252.23Oceano CSD30350.0063.32353.00392.31Grover Beach800132.00129.73932.00470.86Pismo Beach892147.00157.961039.0031.77CSA 1224540.006.46285.00555.5511200.0058.36279.5810.982270.00State Water Deliveries2092.534530747.00547.205277.00702.53150123.29Total ContractorDifference (feet)-27.95% Full56.2%Comments:Available Surplus Water is shown and as designated per BOS May 14, 2019 Declaration of Surplus Water. Beginning with July report, Surplus water shown will be amount purchased by each agency.1) Oceano supplied State Water to Canyon Crest via Arroyo Grande's Edna turn out. A totalof 2.72 AF delivered to Canyon Crest was added to Oceano's State Water usage this monthand 2.72 AF was subtracted from Arroyo Grande's usage this month.April to Present Lopez Entitlement+Surplus Water Usage050100150200250Jan '19 Feb '19 Mar '19 Apr '19 May '19 Jun '19 Jul '19 Aug '19Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage020406080100120Jan '19 Feb '19 Mar '19 Apr '19 May '19 Jun '19 Jul '19 Aug '19Acre FeetOCSDPBCSA12SanMigSan Miguelito77.6412713.71This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request189.73Total Water Deliveries This Month63.32129.73157.9616.0413.71570.49Annual Request0.00Usage0.000.000.000.00%0.000.000.000.000.00945.36252.23392.31470.8631.772092.530.00483.00SWPDeliveriesSWPDeliveriesChange in Storage1167.99This Month Stored State Water0.0%8.3%35.4%20.9%71.5%16.2%42.1%17.7%45.3%2.6%11.1%0.0%49.6%35.5%216.1%0.0%4.8%12.1%39.7%1.6%46.8%10.8%61.1%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%0.0%41.3%83.2%49.0%52.8%13.0%46.2%0.0%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%Last Month Stored State WaterSurplus Requested0.00400.0020.00200.000.00620.00Wednesday, September 4, 2019Page 1 of 1Report printed by:AdminData entered by:D. BravoATTACHMENT 1aItem 8.g. - Page 4I I I I I .. ·™ I• • 0 0 • I 1° 0 • 0 I I I I
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
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
0.00
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
11/1/201812/1/20181/1/20192/1/20193/1/20194/1/20195/1/20196/1/20197/1/20198/1/20199/1/201910/1/201911/1/201912/1/20191/1/20202/1/20203/1/20204/1/20205/1/20206/1/2020Storage (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, 18-19 downstream release requests, and
municipal usage.
ATTACHMENT 2
Item 8.g. - Page 5
40000.0
35000.0
30000.0
25000.0
LI..
~
g:, 20000.0
"' ....
0 ....
V)
15000.0
10000.0
5000.0
0.0
....
00
.-<
0
N .......
.-< .......
.-<
.-<
LOPEZ RESERVOIR STORAGE PROJECTION --Actu ~1 t'rec11 1tat1on -"t'remc ea t'rec 1pItatI01 -,---J ctua1 :,t :>rage --20,0 bO AF -~ Storag ., Proje< tion -~' torage I rojectic n (No R ~in)
C ------r---... ~ -
V '5 -_v
0. I/
5.~4
3.' 7 3. l4
3. ,g 3., 6
2. ,O 2.' 7 2. ~4 2.' 7
2. 9
1. 0 1. 0
1 l9 1 3
al o
0.1 1 Q.( 8 0.( 3 0.( 0 0. 0 0.12
0. )0 0. )0 a.Do o Do oj lo
00 a, a, a, a, a, a, a, a, a, a, a, a, 0
.-< .-< .-< .-< .-< .-< .-< .-< .-< .-< .-< .-< .-< N
0 0 0 0 0 0 0 0 0 0 0 0 0 0
N N N N N N N N N N N N N N ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... .......
.-< .-< .-< .-< .-< .-< .-< .-< .-< .-< .-< .-< .-< .-< ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... ....... .......
N .-< N m '<t Lfl I.O r--00 a, 0 .-< N .-<
.-< .-< .-< .-<
Date
--t'rE mctea _ 11:orage 14.00
12 00
~
_,_ _,-
/
10.00
-
8.00
6.00
3.! 7
3'9 3_, 6 4.00
2.00
1. 3
0 ,4 o., 1
I 0.00
0 0 0 0 0
N N N N N
0 0 0 0 0
N N N N N ....... ....... ....... ....... .......
.-< .-< .-< .-< .-< ....... ....... ....... ....... .......
N m '<t Lfl I.O
127.4
135.9
76
81
0.0
20.0
40.0
60.0
80.0
100.0
120.0
140.0
160.0
Jan-19 Jan-20
Monthly Water Use Comparison
Acre Feet Usage (gpcd)
ATTACHMENT 3
Item 8.g. - Page 6
■ ■