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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 …

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.

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  • 1. Local Water Supply DevelopmentToby Roy, Water Resources Manager September 13, 2011 1
  • 2.  Local Water Supply Development o Supplies developed by water agencies Customer demand reduction o Conservation o Graywater o Stormwater
  • 3. San Diego County Water Supply Diversification 1991 2011 2020Population 2.49 mil Population 3.16 mil Population 3.44 mil 5% 6% 7% 5% 3% 8% 4% 13% 12% 6% 552,000 10% 13% 285,000 231,000 95% Total = 578,000 AF 30% 47% 12% Total = 611,000 AF 24% Total = 779,000 AF (includes conservation savings) (includes conservation savings) Conservation & Recycling: 1991=<1% Metropolitan Water District 2011=42% Local Surface Water 2020=53% Imperial Irrigation District Transfer Groundwater All American & Coachella Canal Lining Seawater Desalination Local Conservation Recycled Water 3
  • 4.  Comparison to imported water costs Advancement in technology Drought proof supplies Reduced dependence on Delta Local control Multiple benefits Regulatory Feasibility
  • 5.  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 5
  • 6. 28,000 af/year today, growing to44,000 af/year by 2020 o Drought-proof water supply o 17 agencies in San Diego purvey recycled water o Primarily used for landscape irrigation
  • 7. Industrial and Commercial Uses Dust Control Cooling Towers Decorative Water FeaturesJohnson & JohnsonToilet/Urinal FlushingLandscape Irrigation B D Biosciences Pharmagen
  • 8.  Non-Potable Reuse ◦ Tertiary treatment: Coagulated, filtered, disinfected ◦ Ensure no cross-connections between potable and recycled water Potable Reuse ◦ Advanced treatment ◦ Environmental barrier
  • 9.  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)
  • 10.  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
  • 11. 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) Carlsbad (Poseidon) ~ $1,800 (2011$)Mission Basin Narrows $1,700 Otay River $2,100 North City IPR * $2,190 (2005$) 0 500 1,000 1,500 2,000 2,500 $/AF Brackish Groundwater Indirect Potable Reuse * Cost of re-treatment not Seawater Desalination included 11
  • 12.  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
  • 13. Regional Actual & Target GPCD1 240 220 Baseline GPCD - 209 200 Actual GPCD 180GPCD 2020 Target GPCD – 167 2 160 Current GPCD - 141 140 120 100 1995 2000 2005 2010 2015 2020 Fiscal Year 1Municipal,industrial and agricultural use; excludes recycled water use 2Target based upon 2009 California law SBX7-7
  • 14. Maintaining Water Use Efficiency Maintain 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 14
  • 15.  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
  • 16.  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
  • 17.  No permits required for outdoor landscape use Homeowner harvesting not a significant supply for San Diego ◦ Rainwater events do not coincide with demand 2.5 8 7 2 6 5 1.5 4 3 1 2 1 0.5 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0 July Feb Aug June Nov April Jan Mar Dec May Sept Oct
  • 18.  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
  • 19.  Visit our website: sdcwa.org 20