Local Supply Development
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Local Water Supply Development Toby Roy, Water Resources Manager September 13, 2011 1
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Presentation on Local Supply Development in San Diego County by Toby Roy, Water Resources Manager for the San Diego County Water Authority. Provided at Water Talks: New Challenges, New Supplies on September 13, 2011. Presentation covers recycled water, conservation, stormwater catchment, graywater.
Transcript of Local Supply Development
Local Water Supply DevelopmentToby Roy, Water Resources Manager
September 13, 20111
Local Water Supply Development
o Supplies developed by water agencies
Customer demand reduction
o Conservation
o Graywater
o Stormwater
Metropolitan Water District
Imperial Irrigation District Transfer
All American & Coachella Canal Lining
Local Conservation
Seawater Desalination
Local Surface Water
Recycled Water
Groundwater
Conservation & Recycling:
95%
5% 7%
13%
30%
24%
6%
6%
10%
4%
12%
13%
8%3%5%
12%
47%
2020=53%
2011=42%
2011 20201991
552,000
285,000 231,000
San Diego County Water Supply Diversification
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Population 2.49 mil Population 3.16 mil Population 3.44 mil
1991=<1%
Total = 578,000 AF
Total = 611,000 AF (includes conservation savings)
Total = 779,000 AF (includes conservation savings)
Comparison to imported water costs
Advancement in technology
Drought proof supplies
Reduced dependence on Delta
Local control
Multiple benefits
Regulatory Feasibility
Local supplies will provide 23% of the region’s water supply by 2020
Groundwater
Recycled Water
Seawater desalination◦ Carlsbad
◦ Camp Pendleton
◦ Rosarito Beach
Indirect Potable Reuse
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28,000 af/year today, growing to 44,000 af/year by 2020
o Drought-proof water supply
o 17 agencies in San Diego purvey recycled water
o Primarily used for landscape irrigation
Industrial and Commercial Uses
Johnson & Johnson
B D Biosciences Pharmagen
Toilet/Urinal FlushingLandscape Irrigation
Dust ControlCooling TowersDecorative Water Features
Non-Potable Reuse◦ Tertiary treatment:
Coagulated, filtered, disinfected
◦ Ensure no cross-connections between potable and recycled water
Potable Reuse◦ Advanced treatment
◦ Environmental barrier
Continue existing non-potable uses
Strong interest in expanding potable reuse◦ Large scale non-potable opportunities are limited
◦ Reliable, proven, cost-effective technology is available
◦ Regulatory reform (SB 918)
20,000 af/year today, growing to 27,000 af/year by 2020
San Diego does not have significant underground storage basins
Brackish groundwater must be desalinated
Seven local agencies have groundwater projects
0 500 1,000 1,500 2,000 2,500
North City IPR *
Otay River
Mission Basin Narrows
Carlsbad (Poseidon)
$/AF
Cost of the Next Increment of Local Supply Actual Proposed San Diego Region Project Unit Costs - $/AF
(Before incentives, grants, or netting out avoided costs)
Brackish Groundwater
Indirect Potable Reuse
Seawater Desalination
$1,700
$2,100
$2,190
* Cost of re-treatment not included
(2005$)
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~ $1,800
(2011$)
Agencies are accountable under SBX 7 7
Retail agencies establish targets (GPCD)◦ Regional Average: 167 GPCD including Agriculture
Develop measures, programs and policies
Targets have been included in UWMP
13% of water supply (104,000 AF) in 2020
100
120
140
160
180
200
220
240
1995 2000 2005 2010 2015 2020
GPC
D
Fiscal Year
Regional Actual & Target GPCD1
Baseline GPCD - 209
2020 Target GPCD – 167 2
Actual GPCD
Current GPCD - 141
1Municipal, industrial and agricultural use; excludes recycled water use2Target based upon 2009 California law SBX7-7
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Maintaining Water Use EfficiencyMaintain recent gains in
conservation
◦ Regional water use down about 30% since 2007
Efficiency needs to be social norm
Collaborative Approaches
◦ Stormwater and conservation
Emphasis on outdoor efficiency
◦ Market transformation
SB 1258 (2008) ◦ Approved by Building Standards
Commission◦ Local Adoption may be more
stringent
SB 518 (2010)◦ BSC to develop standards for
non- residential use
SB 849 (2011)◦ Pending governor’s signature◦ Makes indoor use possible◦ Limits local discretion to be
more stringent
No Permit, No Notice:◦ Flow to irrigation
◦ No connection to potable
◦ No pump
◦ Contained on site
◦ No ponding/runoff
◦ Minimize contact
◦ No hazardous constituents
◦ Operations manual
No permits required for outdoor landscape use
Homeowner harvesting not a significant supply for San Diego◦ Rainwater events do not coincide with demand
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Licensed contractors may install rainwater capture systems for landscaping
Allows indoor use of stormwater:◦ Filtered and disinfected
◦ Local agency issues permit after consulting with local health department
◦ Plumbing installed per IAPMO Codes
Visit our website: sdcwa.org
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