CC 2016-02-23_09f Monthly Water Supply and Demand Update_Jan2016
MEMORANDUM
TO: CITY COUNCIL
FROM: GEOFF ENGLISH, DIRECTOR OF PUBLIC WORKS
BY: SHANE TAYLOR, UTILITIES MANAGER
SUBJECT: MONTHLY WATER SUPPLY AND DEMAND UPDATE
DATE: FEBRUARY 23, 2016
RECOMMENDATION:
It is recommended the City Council receive and review the monthly Water Supply and
Demand Report.
IMPACT ON FINANCIAL AND PERSONNEL RESOURCES:
The cost to provide the report is limited to staff time, which equates to approximately
$500.
BACKGROUND:
The severe drought continues to impact the City’s water supply and demand. As a
result, the City Council declared a Stage 1 Water Shortage Emergency on May 26,
2015. This monthly update on the current supply and demand statistics will provide the
Council with the data required to make decisions related to Emergency Water Shortage
Restrictions and Regulations.
ANALYSIS OF ISSUES:
The severe drought continues. We have received 10” of rain since July 1, 2015 at the
Corporation Yard gauge. Lopez Lake is currently at 29% capacity (14,238 AF of
storage). The Low Reservoir Level Response Plan (LRRP) has been enacted.
At the Zone 3 Advisory Board meeting on May 21, 2015, the Board recommended that
the deliveries from the Water Treatment Plant be reduced by 10% starting April 1, 2015.
This was done in advance of the Lake reaching 15,000 AF of storage, which is the
automatic reduction trigger.
In January the City’s water use was 28% below January 2013. The reduction
requirement imposed by the State Water Resources Control Board for Arroyo Grande is
28%.
Item 9.f. - Page 1
CITY COUNCIL
MONTHLY WATER SUPPLY AND DEMAND UPDATE
FEBRUARY 23, 2016
PAGE 2
Based on current use and weather patterns, Lopez Lake, as predicted, reached the
15,000 AF storage level around November 1, 2015. The Lopez supply for water year
2015/16 for Arroyo Grande is 2,942 AF, which includes 883 AF of carry-over water.
Based on the projected water demand of 2,300 AF, we expect to be able to meet the
demand in water year 2015/16 with minimal groundwater pumping.
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 in front of City Hall on Thursday, February 18, 2016. The
Agenda and staff report were posted on the City’s website on Friday, February 19,
2016.
Attachments:
1. January 2016 Water Supply and Demand Charts
2. Lopez Reservoir Storage Projections
3. Zone 3 - Lopez Project - Monthly Operations Report
Item 9.f. - Page 2
ATTACHMENT 1
City of Arroyo Grande Water Supply and Demand Update-January 2016
Rainfall
Cumulative Rainfall from July 1, 2015 ta Januarv 31, 2016: 10 inches
Cumulative Rainfall
35.0
30 0
...,. 25 0 c
··············
= 200 ii 'l: 15.0
ii
0: 10 0
.. ··
.... ··
··········
... :··
·:: ······· . ,,___
so
o.o
·······....-/ tt__.~, .... :. ................ _
--"'"' _ _. ...... ..; .• -~_..:--~ ...... :~--!..·-_..:_ .:._._._._~_._._.~_._._ --
JUL AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN
=Average Rainfall Year (1995-1996)
-• •Driest Ramlall Year (2013-2014)
• • ••• • Wettest Ramlall Year (1997·1998)
--2015-2016 Rainfall as of January 31, 2016
Note Precipitation data from AG Corp Yard Station No 1771 from July 1966-January 31, 2016
Water Demand
Total Cit~ Demand (AF!
January 2013
January 2016
% Difference from 2013
WY 2013/14 YTD
WY 2015/16 YTD
% Difference from WY 2013/14
Predicted Supply and Demand
WY 2015/16 Predicted Supply and Demand
5,000
4,000
3,000
:t;:
2,000
1,000
172.4
124 6
-28%
2,768.5
1,799.7
-35%
El Lopez Entitlement (·lD°A.) 0 Lopez Surplus D SMGB Groundwater Allocat1on
[[]Pismo Formation Groundwater IJWY 2015/16 Target Demand
Note The Water Year (WV) for water demand 1s from April to March
Water Supply
Lopez toke
I Remaining, Allocated
Jan-16 WY 15Ll6 Year to Date ~
Lake Elevation (full at 522 37 ft) 466 87' --~ .. ,. -": ~ . !'•" ....... __
' -,,,· ' ,-~--
Storage (full at 49,200 AF) 14,238 3 .• " . " -. ' ---; '
Storage -Percent Full 29% ·~-~ .:~ '
,•'
,, --"
Status Enacted .• " :
Current Entitlement Reduction 10% ·:3-__ :_;-:.: ,.· ·i:-·;;·--". : __ c' i_c-, ;_•, -::-'., -;; .~
Deliveries (AF) 123 33 1,n1.50 I 1,210.65
Note The Water Year (WY) for Lopez Lake is from Apnl to March The actual amount of storage In Lopez at the end of January 2016 was 14,207 AF,
however, the storage amount and storage percentage above were adjusted to account for the ~31 27 AF of stored State Water Project water in the lake
Groundwater
Jan-16 Calendar Year to Date Remaining, Entitlement
SMGB Production (AF} 1.3 1.3 1,321.7
Pismo Formation Production (AF) 0.0 0.0 ---'NA:, . .;-::,., -"
City SMGB average well levels for January 2016 were the same as levels m January 2015.
Note. Groundwater entitlement and production data Is based on the calendar year
Water Supply, Demand and Delivery Chart
350 --------------
300
s.250 ~ u
~200 a ~150
·~ 100
Qi
c 50
0 --~ ,_:_,
<:t <:t <:t <:t <:t <:t <:t .... .... .... .... .... .... ....
.!. >-i::. ' il.o a. tJ ~ c. "' ~ " OJ < ::2: < "' 0
=Lopez Water Available (AF}
~Lopez Water Delivery
-SMGB Water Pumped (AF)
.....:._ ______
<:t <:t 11'1 11'1 11'1 11'1 .... .... .... .... .... .... > 0 i::. .6 .!. .!.
0 OJ El OJ "' c. z a u. ::2: <
-Predicted Pismo Formation Production
---Average Demand 2011-2013 (AF)
-----------~--
11'1 11'1 11'1 11'1 11'1 11'1 11'1 11'1 IJ) IJ) .... .... .... .... .... .... .... .... ';' ';' >-il.o a. ..!. > 0 i::. .6 c: ~ u "' ::2: ~ " OJ 0 OJ El OJ < "' 0 z a u.
EEEEI Groundwater Allotment Available
Bmlll Pismo Formation Water Pumped (AF)
-Predicted Lopez Water Delivery
UDlllD Predicted SMGB Production
6,000
5,ooo_
s.
4,000 ~ ·c:
3,ooom
~
2,000~
c.
" 1,000 VI
0
Note These production forecasts contain prehmmary estimates of water production and draft pred1ct1ons of future production based on historical
averages
Updated: 2/9/2016
Item 9.f. - Page 3
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Item 9.f. - Page 4
Contractor
Arrovo Grand
OceanoCSD
Grover Beach
Pismo Beach
CSA 12
San Mi1mehto
Total
San Luis Obispo County Flood Control and Water District
Zone 3 -Lopez Project -Monthly Operations Report
January, 2016
Lopez Water Deliveries State Water Deliveries
This Month Apnl to Present This Month January to Present
% of Annual SWP
Request Dehvenes
Surplus
Usage %
!.:i SWP !Change m
Rcqu"' Deltvenes Storage
Usage
000 0 O'/o 1731 50 84 0% 1731 50 S8 9%
000 00% 000 0 O'lo 000 00% 7SO S069 68% .... ~--:-.... -S069 68%
66884 929% 000 0 O'/o 668 84 60 1% '-~-
S4 93 68% 000 0 O'lo 5493 42% 1240 75 00 6 O'lo 7S 00 6 O'lo :
9034 410% 000 0 O'lo 9034 17 7% 57 062 11% 062 11% 0
110 7 96 72% .· ,,....)',., .,_ ,..,,__,. 796 72%
2545.61 62.4% 0.00 0.0% 2545.61 38.5% 2157 134.27 6.2% 103 I -31.27 134.27 6.2% 103.00
'"l"'",,.1':F..-.. -ri?"';!_; ·----
r_ ~ ; _,.
April to Present Lopez Entitiement+Surplus Water Usage
250...-~~~~~~~~~~~~~~~~~~~~~~~
200+-~--<'1-~~~~~~~~~~~~~~~~~~~~
1il if 150
e 100
.:! so
Apr May Jun Jul '15 Aug Sep OCt Nov Dec Jan
~ ~ ~ ~ ~ ~ ~ ~ ~
ioAG•GBDOCSDDPB•CSA12 I
Nole Dehvenes are 10 acre feet One acre foot= 32S, 8SO gallons or 43, S60 cubic feet. Safe yield 1s 8, 730
acre feet
Lopez Dam Operations This Month Year to Date
Lake Elevation (full at S22 37 feet) 46687 -~ ~ .... ~ Difference (feet) I ,,,,
Storage (full at 49200 acre feet) 14207 --' %Full I ...
Rainfall 626 1236
Downstream Release (4200 acre feet/year) 1742 349776
Spillage (acre feet) 0 000
-SS SO I
289% I
·. Last Month Stored State Water 0 This Month Stored State Water -31.27
January to Present State Water Usage
~ ~I e
:1 +-----.l
Apr May Jun Jul Aug Sep Oct Nov Dec Jan
'15 '15 '15 '15 '15 '15 '15 '15 '15 '16
loocsDDPB•csA12osanMlg I
"Year to Date" 1s January to present for State water, Apnl to present for Lopez delivenes, and July to present
forramfall
Comments: Reservoir ts currently operated under the Low Reservoir Response Plan, therefore
Entitlements shown represent a I 0% reduction
Surplus water sho"'11s actually 'Cany Over' water as designated m the LRRP
I) Oceano supplied State Water to Canyon Crest Via Arroyo Grande's Edna tum out A total
of I OS AF delivered to Canyon Crest was added to Oceano's State Water usage this month
and I OS AF was subtracted from Arroyo Grande's usaAe this month
ATTACHMENT 3
Total Water
Deliveries
This Month
123 33
50 69
6786
7946
937
796
338.67
Fruiay, February S, 2016 Data entered by-J Ogren Report prmted by Admm Page I of I
Item 9.f. - Page 5
THIS PAGE INTENTIONALLY LEFT BLANK
Item 9.f. - Page 6