making the most of our surface storage – a san diego story
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Making the Most of our Surface Storage – a San Diego Story. San Diego County Water Authority Amy Chen MWD Program Chief [email protected]. Overview of Presentation. System Overview Reservoir Systems Regional Investments in Supply Reliability Historical Use and Operations of Reservoirs - PowerPoint PPT PresentationTRANSCRIPT
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Making the Most of our Surface Storage – a San Diego Story
San Diego County Water AuthorityAmy Chen
MWD Program [email protected]
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Overview of PresentationSystem OverviewReservoir SystemsRegional Investments in Supply ReliabilityHistorical Use and Operations of
ReservoirsConclusions
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The Water Authority formed in 1944 under County Water Authority Act 24 member agencies 36-member Board of Directors
Service Area Approximately 3.1 million residents
(97% of County population) Regional economy of $186 billion
Facilities 300 miles of large diameter, gravity
flow pipeline in two major alignments
131 service connections - treated and untreated
Dams, reservoirs, pump stations, hydroelectric facilities, treatment plant
San Diego County Water Authority
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Water Authority Service Area Historic and Projected Normal Year Demands
450
500
550
600
650
700
750
800
850
1990
1993
1996
1999
2002
2005
2008
2015
2018
2021
2024
2027
2030
2033
Tota
Dem
and
(TA
F)
2010 UWMP Projected Demand(after SBX7-7 retail compliance)
1990-2010 Historic Demand
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San Diego Region WatershedsSan Juan
Santa Margarita
Orange County
San Diego County
Impe
rial C
ount
y
San Luis Rey
CarlsbadSan Dieguito
Penasquitos San Diego River
SweetwaterPueblo
OtayTijuana
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San Diego County Reservoir Storage Overview
Reflects historic and modern investments25 Reservoirs in the San Diego Region
Total Storage Capacity 590,000 AF12 Supply reservoirs connected to aqueduct
systemCurrent Regional Storage level is: 395,000 AF
Water Authority Storage is : 47,000 AFReservoirs are owned and managed by Member
Agencies (Except Olivenhain)
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Storage Pools by Reservoir
Barre
tt
Dixon
Hen
shaw
Jenn
ings
Lower
Ota
y
Mor
ena
Oliv
enha
in
Ramon
a
San
Diegu
ito
Suth
erla
nd
Woh
lford
0%10%20%30%40%50%60%70%80%90%
100%
Member Agency Emergency Water Authority 7
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Henshaw
Dixon
WohlfordEscondido-Vista WTP
Total Storage = 61,000 AFTreatment = 65 mgd
Sutherland
San Vicente*
El Capitan
Miramar WTP Miramar
MurrayAlvaradoWTP
Total Storage = 243,000* AFTreatment = 415 mgd
Olivenhain
HodgesOlivenhain WTP
Total Storage = 58,000 AFTreatment = 34 mgd
El CapitanJenningsLevy
WTP
Cuyamaca
Total Storage = 28,000 AFTreatment = 106 mgd
Loveland
SweetwaterPerdueWTP
Total Storage = 53,000 AFTreatment = 30 mgd
Barrett
OtayOtayWTP
Morena
Total Storage = 138,000 AFTreatment = 40 mgd
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$2.5 billion regionally since 2000$1.5 billion Emergency/Carryover
Storage ProjectNew and expanded surface storageReoperation of existing reservoirs
$800 million in treatment to optimize conjunctive use of storageTwo new treatment plantsExpansion of three existing plants
Regional Investments In Storage Operations and Conjunctive Use Since 2000
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ESP/CSP
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200,000 AF of regional storageOne new reservoir and
Dam (Olivenhain)Raise of existing San
Vicente DamConnect Lake Hodges
to existing AqueductPipelines and Pump
stations to optimize treatment and conveyance
Final Phase in Construction
San Vicente Dam Raise complete late 2012
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Project: Olivenhain Dam & ReservoirComplete: 2003Cost: $198 millionBenefit: 25,000 AF of storage
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Project: Lake Hodges ProjectsComplete: 2011Cost: $196 millionBenefits: 20,000 AF ESP storage; 40MW power
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Project: San Vicente Pipeline & TunnelComplete: 2011Cost: $459 millionBenefit: Improved Water Delivery
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Project: San Vicente Dam RaiseComplete: 2012Cost: $482 millionBenefit: 152,000 AF of new storage
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Complete: 2008Cost: $179 millionBenefit: 100 MGD treated supply for region 17
Project: Twin Oaks Water Treatment Plant
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San Diego Regional Investmentsin Treatment
Project Cost
Levy Water Treatment Plant Expansion $46,000,000
Olivenhain Water Treatment Plant $98,000,000
Alvarado Water Treatment Plant Expansion $202,000,000
Earl Thomas Reservoir upgrade $31,000,000
Miramar Water Treatment Plant Expansion $200,000,000
Otay Water Treatment Plant Expansion $25,000,000
Otay Water Treatment Plant clear well $10,000,000
Twin Oaks Valley Water Treatment Plant $179,000,000
Total $791,000,000
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Multi-purpose ReservoirsCapture local runoffAnnual yield
Average 59,600 AFSeasonal shift of raw water demand from
summer to winter to reduce summer peak demand
Managing variations in weather and runoffFlood control considerationsRegulatory storage to feed water treatment
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10 Year Reservoir Imported/Local
1999 2000 2001 2002 2003 2004 2005 2006 2007 20080
20,000
40,000
60,000
80,000
100,000
120,000
140,000
160,000
180,000
SSOA/SSS Take Local Production
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Actual Example of Using Reservoirs to Shift Peak Demands
Jan-
07
Jan-
07
Feb-0
7
Mar
-07
Mar
-07
Apr-0
7
May
-07
May
-07
Jun-
07
Jun-
07
Jul-0
7
Aug-0
7
Aug-0
7
Sep-
07
Oct-0
7
Oct-0
7
Nov
-07
Dec-0
7
Dec-0
7100
300
500
700
900
1100
1300
1500
Actual Adjusted for w/o SSOA Deliveries
cfs
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ConclusionsDue to geologic constraints, limited groundwater
basins in San Diego countySurface reservoirs were built to capture runoff
Majority of reservoirs were built before imported water Designed to maximize yield from local runoff
Since imported water deliveries, Water Authority has worked with member agencies to optimize use of imported water Integration of regional system with member agencies
systems Additional reservoirs; conveyance system; treatment plants
Coordinated efforts continue today to ensure supply reliability and facility optimization
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