CC 2019-09-24_08e Monthly Water Supply and Demand Update_AugustMEMORANDUM
TO: CITY COUNCIL
FROM: BILL ROBESON, PUBLIC WORKS DIRECTOR
BY: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: SEPTEMBER 24, 2019
SUMMARY OF ACTION:
The update reports the water supply and demand for August 2019. 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On April 25, 2017, the City Council, by resolution, rescinded the Stage 1 Water Shortage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 August 2019, the City’s water use was 211.3 acre-feet with a per capita use of 126
gallons per day/per person. There was a total of 0” of rainfall in August. The water use
for the current “rolling” water year from September 2018 to August 2019 was 2,110 acre-
feet, which equates to a per capita use of 107 gallons per day/per person. There was a
total of 19.35” of rain fall for this period.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of September 12, 2019 shows San Luis Obispo
County in a normal condition. Rainfall to date (July 1, 2019 to August 31, 2019) was 0
inches at the Corporation Yard rain gauge. Lopez Lake, as of September 12, 2019, is at
55.3% capacity (27,309 acre-feet of storage).
Item 8.e. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
SEPTEMBER 24, 2019
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 August 2019
1a. Lopez Monthly Operations Report for March 2019
2. Lopez Reservoir Storage Projection
3. Monthly Water Use Comparison
Item 8.e. - Page 2
San Luis Obispo County Flood Control and Water District
Zone 3 - Lopez Project - Monthly Operations Report
August, 2019
0.00
Note: 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.
945.36
April to Present
0.00
Arroyo Grande 2290
Lopez Dam Operations
Lake Elevation (full at 522.37 feet)494.42
Storage (full at 49200 acre feet)27626
Rainfall 0
Downstream Release (4200 acre feet/year)237.22
Spillage (acre feet)0
This Month Year to Date
986.64
0.00
378.00 189.73
Entl.Surplus
Water
Declared Usage
2668.00
Total
Lopez Water Deliveries
252.23Oceano CSD 303 50.00 63.32353.00
392.31Grover Beach 800 132.00 129.73932.00
470.86Pismo Beach 892 147.00 157.961039.00
31.77CSA 12 245 40.00 6.46285.00
555.5511200.00
58.36279.58
10.982270.00
State Water Deliveries
2092.534530747.00 547.205277.00 702.53150123.29Total
Contractor
Difference (feet)-27.95
% Full 56.2%
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 total
of 2.72 AF delivered to Canyon Crest was added to Oceano's State Water usage this month
and 2.72 AF was subtracted from Arroyo Grande's usage this month.
April to Present Lopez Entitlement+Surplus Water Usage
0
50
100
150
200
250
Jan '19 Feb '19 Mar '19 Apr '19 May '19 Jun '19 Jul '19 Aug '19Acre FeetAG GB OCSD PB CSA12
January to Present State Water Usage
0
20
40
60
80
100
120
Jan '19 Feb '19 Mar '19 Apr '19 May '19 Jun '19 Jul '19 Aug '19Acre FeetOCSD PB CSA12 SanMig
San Miguelito 77.6412713.71
This Month
%
Total
January to Present
Usage
This Month
% of
Annual
Request
Usage % of Annual
Request
189.73
Total Water
Deliveries
This Month
63.32
129.73
157.96
16.04
13.71
570.49
Annual
Request
0.00
Usage
0.00
0.00
0.00
0.00
%
0.00
0.00
0.00
0.00
0.00
945.36
252.23
392.31
470.86
31.77
2092.530.00 483.00
SWP
Deliveries
SWP
Deliveries
Change in
Storage
1167.99This Month Stored State Water
0.0%
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%
Entitlement Surplus
Usage %Usage %
Entitlement Surplus
Usage %
Last Month Stored State Water
Surplus
Requested
0.00
400.00
20.00
200.00
0.00
620.00
Wednesday, September 4, 2019 Page 1 of 1Report printed by:AdminData entered by:D. Bravo
ATTACHMENT 1
Item 8.e. - Page 3
I
1 □ ■ □ □ ■ 1 □ □ ■ □
I I
I I
San Luis Obispo County Flood Control and Water District
Zone 3 - Lopez Project - Monthly Operations Report
March, 2019
304.04
Note: 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.
2084.03
April to Present
26.11
Arroyo Grande 2290
Lopez Dam Operations
Lake Elevation (full at 522.37 feet)496.59
Storage (full at 49200 acre feet)29008
Rainfall 5.19
Downstream Release (4200 acre feet/year)196.41
Spillage (acre feet)0
This Month Year to Date
3830.12
0.00
564.00 124.37
Entl.Surplus
Usage
2854.00
Total
Lopez Water Deliveries
378.00Oceano CSD 303 75.00 0.00378.00
809.04Grover Beach 800 197.00 57.71997.00
1112.00Pismo Beach 892 220.00 0.001112.00
74.13CSA 12 245 60.00 2.80305.00
278.55112098.50
15.78275.55
10.9822710.98
State Water Deliveries
4457.2045301116.00 184.885646.00 327.811501122.80Total
Contractor
Difference (feet)-25.78
% Full 59.0%
Comments:Surplus water shown is as designated per BOS May 15, 2018 Declaration of Surplus Water.
1) Oceano supplied State Water to Canyon Crest via Arroyo Grande's Edna turn out. A total
of 1.1 AF delivered to Canyon Crest was added to Oceano's State Water usage this month
and 1.1 AF was subtracted from Arroyo Grande's usage this month.
April to Present Lopez Entitlement+Surplus Water Usage
0
50
100
150
200
250
Apr
'18
May
'18
Jun
'18
Jul
'18
Aug
'18
Sep
'18
Oct
'18
Nov
'18
Dec
'18
Jan
'19
Feb
'19
Mar
'19Acre FeetAG GB OCSD PB CSA12
January to Present State Water Usage
0
20
40
60
80
100
120
Apr
'18
May
'18
Jun
'18
Jul
'18
Aug
'18
Sep
'18
Oct
'18
Nov
'18
Dec
'18
Jan
'19
Feb
'19
Mar
'19Acre FeetOCSD PB CSA12 SanMig
San Miguelito 22.501277.77
This Month
%
Total
January to Present
Usage
This Month
% of
Annual
Request
Usage % of Annual
Request
124.37
Total Water
Deliveries
This Month
30.6
66.75
98.5
8.35
7.77
336.34
Annual
Request
0.00
Usage
19.62
9.04
0.00
0.00
%
0.00
75.00
9.04
220.00
0.00
2084.03
303.00
800.00
892.00
74.13
4153.1628.66 205.00
SWP
Deliveries
SWP
Deliveries
Change in
Storage
76 -46.80
1264.71This Month Stored State Water
27.2%
5.4%73.0%
0.0%100.0%
7.2%81.1%
0.0%100.0%
1.1%24.3%
8.8%24.9%
20.6%58.4%
4.8%4.8%
4.1%78.9%8.2%21.8%
6.1%17.7%
0.0%
26.2%
4.6%
0.0%
0.0%
0.0%
100.0%
4.6%
100.0%
0.0%
91.0%
100.0%
100.0%
100.0%
30.3%
91.7%2.6%
Entitlement Surplus
Usage %Usage %
Entitlement Surplus
Usage %
1311.51Last Month Stored State Water
Friday, April 5, 2019 Page 1 of 1Report printed by:AdminData entered by:D. Bravo
ATTACHMENT 1a
Item 8.e. - Page 4
I ......... mt
1° • 0 0 • I 1° 0 • 0 I
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I I
0.00 0.00 0.00 0.00 0.23
2.50
1.19
6.47
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3.94
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2.34
0.00 0.000.06 0.32 0.62
1.70
2.57
3.59 3.87
3.46
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LOPEZ RESERVOIR STORAGE PROJECTION
Actual Precipitation
Predicted Precipitation
Actual Storage
Predicted Storage
20,000 AF
Storage Projection
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.e. - Page 5
40000.0
35000.0
30000.0
25000.0
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15000.0
10000.0
5000.0
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LOPEZ RESERVOIR STORAGE PROJECTION
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0 0 0 0 0 0 0 0 0 0
N N N N N N N N N N ......... ......... ......... ......... ......... ......... ......... ......... ......... ......... .... .... .... .... .... .... .... .... .... .... ......... ......... ......... ......... ......... ......... ......... ......... ......... .........
°' 0 .... N .... N M '<t U"I I.O .... .... ....
Date
-1 Actual recipita ion 14.00 -I Predict •d Preci~ itation -• Actual torage -• Predict ed Stora1 e 12.00
--20,000 I\F
-w wb' ...-,....:\..\.IVI -------10.00
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4.00
2.00
0.( 8 0.( 3 0.f
0.' 0 I 0.(0 0.1 0 0.( 0 I
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0.00
°' °' °' °' °' .... .... .... .... ....
0 0 0 0 0
N N N N N ......... ......... ......... ......... ......... .... .... .... .... .... ......... ......... ......... ......... ......... ,-... 00 °' 0 .... .... ....
221.3211.3132126050100150200250Aug‐18 Aug‐19Monthly Water Use ComparisonAcre FeetUsage (gpcd)ATTACHMENT 3Item 8.e. - Page 6■ ■