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Local Supply Development
The document outlines local water supply development in San Diego County, highlighting the increasing dependence on various water conservation measures and local supply sources like recycling and desalination to meet growing demand as the population expands. It details the projected growth in recycled water use and potable reuse, alongside associated technological advancements and regulatory reforms. Additionally, it discusses the sustainability goals and efficiency measures needed to maintain water supply amidst changing climatic conditions and regulatory requirements.
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Local Supply Development
- 1. Local Water SupplyDevelopment Toby 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 CountyWater Supply Diversification 1991 2011 2020 Population 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 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
- 7. Industrial and CommercialUses Dust Control Cooling Towers Decorative Water Features Johnson & 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/yeartoday, 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 theNext 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 180 GPCD 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 UseEfficiency 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
- 19. 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
- 20. Visit our website: sdcwa.org 20