CC 2018-11-27_09d Monthly Water Supply and Demand Update
MEMORANDUM
TO: CITY COUNCIL
FROM: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: NOVEMBER 27, 2018
SUMMARY OF ACTION:
The update reports the water supply and demand for October 2018. 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On April 25, 2017, the City Council, by resolution, rescinded the Stage 1 Water Shortage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 conservation measures were to remain in effect.
In October 2018, the City’s water use was 197.3 acre-feet with a per capita use of 118
gallons per day/per person. There was a total of 0.4” of rainfall in October. The water
use for the current “rolling” water year from November 2017 to October 2018 was 2,273
acre-feet, which equates to a per capita use of 115 gallons per day/per person.
ANALYSIS OF ISSUES:
The United States Drought Monitor, as of November 13, 2018 shows San Luis Obispo
County in a severe drought. Rainfall to date (July 1, 2018 to October 31, 2018) is 0.4
inches at the Corporation Yard rain gauge. Lopez Lake, as of November 15, 2018, is at
40.4% capacity (19,960 acre-feet of storage).
The new water year began on April 1, 2018 and the City’s current total available supply
from Lopez is 2,290 acre-feet, our normal entitlement plus 564 acre-feet of surplus water.
Item 9.d. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
NOVEMBER 27, 2018
PAGE 2
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 water year 2018/19 is 2,000 acre-feet if the City receives
average rainfall.
On November 14, 2018 Lopez Lake storage fell below 20,000 acre-feet. The City
requested a voluntary 10% flow reduction to conserve 216,000 gallons a day behind the
dam. No additional restrictions are placed on our customers with this flow reduction.
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.
Attachments:
1. Lopez Monthly Operations Report for October 2018
1.a. Lopez Monthly Operations Report for March 2018
2. Lopez Reservoir Storage Projection
3. Monthly Water Use Comparison
Item 9.d. - Page 2
San Luis Obispo County Flood Control and Water DistrictZone 3 - Lopez Project - Monthly Operations ReportOctober, 201818.86Note: 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.1398.66April to Present0.67Arroyo Grande2290Lopez Dam OperationsLake Elevation (full at 522.37 feet)481.5Storage (full at 49200 acre feet)20417Rainfall0.67Downstream Release (4200 acre feet/year)392.82Spillage (acre feet)0This MonthYear to Date2553.010.00564.00189.62Entl.SurplusUsage2854.00TotalLopez Water Deliveries280.13Oceano CSD30375.0025.43378.00463.63Grover Beach800197.0085.46997.00910.86Pismo Beach892220.00122.971112.0049.41CSA 1224560.007.92305.00205.002050.0073.1583.966.200.0000.00State Water Deliveries3102.6945301116.00431.405646.00371.20408.9616.71Total ContractorDifference (feet)-40.87% Full41.5%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 2.05 AF delivered to Canyon Crest was added to Oceano's State Water usage this monthand 2.05 AF was subtracted from Arroyo Grande's usage this month.April to Present Lopez Entitlement+Surplus Water Usage050100150200250Jan'18Feb'18Mar'18Apr'18May'18Jun'18Jul '18 Aug'18Sep'18Oct'18Acre FeetAGGBOCSDPBCSA12January to Present State Water Usage020406080Jan'18Feb'18Mar'18Apr'18May'18Jun'18Jul'18Aug'18Sep'18Oct'18Acre FeetOCSDPBCSA12SanMigSan Miguelito93.0512010.51This Month%TotalJanuary to PresentUsageThis Month% of Annual RequestUsage% of Annual Request189.62Total Water Deliveries This Month25.4385.46141.8314.1210.51466.97Annual Request0.00Usage0.000.0018.860.00%0.000.000.0018.860.001398.66280.13463.63892.0049.413083.8318.86582.00SWP DeliveriesSWP DeliveriesChange in Storage6144.291340.55This Month Stored State Water1.7%8.3%49.0%8.4%74.1%10.7%46.5%13.8%81.9%3.2%16.2%0.0%100.0%7.4%87.1%0.0%0.0%9.5%55.0%4.1%90.8%8.8%77.5%0.0%0.0%0.0%8.6%0.0%0.0%0.0%0.0%8.6%0.0%61.1%92.5%58.0%100.0%20.2%68.1%1.7%EntitlementSurplusUsage%Usage%EntitlementSurplusUsage%1296.26Last Month Stored State WaterWednesday, November 14, 2018Page 1 of 1Report printed by:AdminData entered by: D. SpiegelATTACHMENT 1Item 9.d. - Page 3lo ■ o o ■ I lo o ■ o I T I I I
Supply Summary
ATTACHMENT 1a
Item 9.d. - Page 4
Con trac tor
Affovo Grande
Oceano CSD
Grover Beach
Pismo Beach
CSA 12
San Miin1el i to
Tota l
Sa n Lui s Obi spo Co unty F lood Co ntro l and \Va ter Distri ct
Z on e 3 -Lopez P roject -Mo nthly Operati on s R epo rt
March , 20 18
Ent!.
2290
303
800
892
245
4530
Lop ez Wa ter Deliveries
This Month
Surplus Total Entitlement Surplus Entitlement
Usage % Usage % Usage
1249.20 3539.20 144 .13 6.3% 0.00 0.0% 2 146.32
840.5 0 1143.50 0.00 0 .0% 50.60 6.0% 303 .10
240 .20 1040.20 66.10 8.3 % 0.00 0.0% 748 .85
1834.2 0 2726.20 0.00 0.0% 91.82 5.0% 892 .00
499.60 744.60 3.17 1.3% 0.00 0.0% 87.92
4663.70 9 193.70 213.40 4.7% 142.42 3 .1% 41 78.19
April to Presen t Lo pez Entitl ement+Sur pl us Wa ter Usa ge
Apr May Jun Jul Aug Sep Oct Nov De c Jan Feb Ma r
'17 '17 '17 '17 '17 '17 '17 '17 '17 '18 '18 '18
i □AG ■GB □OC SD □P B ■C SA12 I
%
93 .7%
100 0"/4
93 .6%
100 .0"/4
35.9%
92.2 %
April to Present
Surplus
Usage %
0 .00 0 .0%
404.39 48 .1%
0.00 0.0%
4 58.17 25.0%
0.00 0.0%
862.56 18.5 %
Note: Deliveries are in acre feet. One acre foo t = 325, 850 gallons or 4 3, 560 c ubic feet . Safe yield is 8,730
acre feet .
Lopez Dam Operations T his i\Ionth Year to Date
Sta te W ater Deliv erie s
11us Month Jan uary to Present
Total Annual Usage ~• of SWP I Change in Usage % of Annual
ft.mu.I
Usage % Request Request Deliveries Storage Request
2146.32 60.6%
707.49 61.9% 227 0.00 0.0% 0 .00 0 .0%
748.85 72.0%
1350.17 49.5% 11 20 19.00 1.7% 28.00 2.5%
87 .92 11.8% 27 6.02 22.3% 16.12 59.7%
127 8.99 7.1% 20.55 16.2%
5040.7 5 54 .8% 150 1 34.01 2.3 % 67 I 32 .99 64.67 4 .3 %
Last Month Stored State Water 1143.09 I 1bis Mouth Stored State Water
January to Present Sta te Wate r Usage
1 :j+----1 ----I.a
Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar
·17 '17 '17 '17 ·17 '17 ·17 ·17 ·17 "18 '18 '18
lo OC SD □PB ■ CSA12 □ SanMig I
SWP
Deliveries
111 .00
11 76 .08
"Year to Date" is January to present for State wa ter, Aprtl to present for Lopez deliveries, and J uly to present
for rainfall.
Lake Elevation (full at 522.37 feet ) 49 1.65 Difference (feet) I -30 .72 I
Comments: Reservoir is currently operated nnder the Low Reservoir Response Plan. Reservoir is above
20,000 AF therefore no reduction in entitlements.
Storage (full at 49200 acre feet) 25934
Rainfall 8.69
Downstream Release (4200 acre feet/year) 247 .35
Spillage (acre feet) 0
%Full I
12.67
3436.48
000
52.7% I Surplus water sho\\n is actually "Carry Over" water as designated in th e lRRP and u pdated
per BOS May 2,20 17 Declaration of Surplus.
I ) Oceano suwlied State Water to Canyon Crest via Arroyo Grande's Edna rum out. A total
of 1.55 AF delivered to Canyon Crest was added to Oceano's State Water usage di.is month
and 1.55 AF was subtracted from Arroyo Grande's usage tlus month.
T ota l Water
Delh-e1ies
This i\lonth
144.13
50.6
66.1
11 0.82
9.19
8.99
389.83
2.500.207.760.220.000.010.010.000.000.230.621.702.573.593.873.460.002.004.006.008.0010.0012.0014.000.05000.010000.015000.020000.025000.030000.035000.040000.01/1/20182/1/20183/1/20184/1/20185/1/20186/1/20187/1/20188/1/20189/1/201810/1/201811/1/201812/1/20181/1/20192/1/20193/1/2019Precipitation (in)Storage (AF)DateLOPEZ RESERVOIR STORAGE PROJECTIONActual PrecipitationPredicted PrecipitationActual StorageProjected Storage20,000 AFNote: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.2. Municipal Usage is based on 2010‐2017 average monthly deliveries.ATTACHMENT 2Item 9.d. - Page 5LOPEZ RESERVOIR STORAGE PROJECTION 4000 14 00 -• t~ '( 1 -• Pred,cted Pree p · ~500 . , . -• 00 -~PrOJ cted Stora -.,. 20, AF 3000 • 00 2500 I 7.76 0 ----:: ---1500 3159 3 ~7 3 46 4 D 1000 2 ,O 2 57 1t,o 5000.0 0 62 0.20 0~2 opo op1 op1 ODO 0 )0 0.23 0.0 ~ "' "' "' "' ~ ~ "' "' "' "' "' ~ "' ~ 0 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 "' U') "' "' ~ N N "' ... ... Date
234.5197.3140118050100150200250Oct‐17 Oct‐18Monthly Water Use ComparisonAcre FeetUsage (gpcd)ATTACHMENT 3Item 9.d. - Page 6■ ■