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- 1. Randall Barron, CLIA, QWEL, ARCSA Water Conservation Technician City of Santa Rosa
- 2. Overview of our Water System Santa Rosas population is 161,496 Provide water and sewer services Over 52,000 service connections Approximately 43,000 SFR, 3,000 MFR, 3,000 CII and 1,700 dedicated irrigation customers In 2008, delivered 18,450 acre-feet of water Currently most of our water supply from SCWA Additional Groundwater Sources Available
- 3. Snapshot of Santa Rosas Demand Current Demand Average daily use: 17 mgd Winter daily use: 13 mgd Peak month average daily use: 32.5 mgd
- 4. Water Use Efficiency Program Started in 1976-77 in response to the drought Further established in the early 1990s Signatory to CUWCC MOU in 1998 Saving 4,497AFY or over 4.0 mgd Reduces GHGs by 2,900 tons per year
- 5. Water Conservation Programs Rebate and Incentive Programs Residential & Commercial Residential Check-ups Indoor & Outdoor Free water efficient shower heads, faucet aerators, hose shutoff nozzles Customer Information and Outreach Public events, hotline, website Home Audit Kits, Turf-time, Top Ten Tips Large Landscape Irrigation Audits Water use analysis Irrigation Efficiency Tiered Water Rates
- 6. Conservation Technologies Green Exchange Cash for grass Irrigation Upgrades Rainwater Harvesting Gray Water Turf Time information Water Wise Gardening
- 7. Rainwater Rebate $0.25 per gallon of storage Rebate is limited to the estimated peak month gallons of water use for the site Rebate cannot exceed the cost of materials, labor not included Backflow required for all systems Requirement depends on system Plumbing permit needed Requires annual testing Pre & post inspection by Water Use Efficiency section Permits required by Building Dept
- 8. Rainwater Additional Info Electrical permit needed if pump installed Other permits as required Must insure vector control consider length of storage and include appropriate treatment if needed Recommended that all vents and inlets have mesh screens at minimum to prevent debris from entering storage Recommend maximizing irrigation efficiency in order to more efficiently use stored rainwater
- 9. Peak Month Water Use At pre-inspection, all landscape square footage is measured as low (LW), moderate (MW) and high (HW) water use. Low water use assigned 30% of Eto, moderate 60% and high 100%. Budget is determined using peak month ET (July) Formula is (( HW ( MW * .6) ( LW * .3)) * 6.6 * .623 ) / 1000 where 6.6 is 10-year avg ET for July and .623 is conversion factor for gallons Outcome is site water budget for peak month in 1000s of gallons, rounded up to nearest 1000.
- 10. Current Projects Program authorized January of 2009. Advertised to customers starting spring 2009. Eighteen pre-inspections to date 17 residential, 1 commercial. Five residential projects currently completed. Average storage installed: 4815 gallons Min: 1000 gallons. Max: 11400 gallons. Total: 24076 gallons Commercial project planned at local High School Planned installed storage: 89000 gallons Site budget is over 2.5 million gallons Commercial (dedicated irrg meter) outreach next planned push
- 11. Case Studies
- 12. Case 1 5600 sq ft of total landscaping 15Kgal budget Lawn reduction and irrigation improvements installed in June 2009 (prior to rainwater system)
- 13. Installed System Pump and WISY filter pressure tank 3076 gal tank
- 14. Statistics Summer (May-Sep) 2007: 112,000 gallons Prior to changes Summer (May-Sep) 2008: 62,000 gallons Turf reduction Plant establishment Summer (May-Sep) 2009: 37,000 gallons RWH system installed Summer (May-Sep) 2010: 33,000 gallons
- 15. Case 2 15600 sq ft of total landscaping 24Kgal budget No irrigation improvements prior to RWH system installation
- 16. Installed System Pumped from collection to storage Gravity feed to irrigation system
- 17. Statistics Summer (May-Sep) 2007: 140,000 gallons Prior to changes Summer (May-Sep) 2008: 126,000 gallons 550 gallons storage installed Summer (May-Sep) 2009: 75,000 gallons Additional 4500 gallons installed Summer (May-Sep) 2010: Additional 6000 gallons installed 33,000 gallons
- 18. Rebate Cost v. Savings Current cost per acre foot of water: $ 604 Projected cost in 2011: $ 676 Cost to city of rebate: $ 678 Site water savings due to increase in consumer awareness: Pri蔵ele$$
- 19. Questions Thank you Randall S Barron, City of Santa Rosa, (707) 543-3994, rbarron@srcity.org
Editor's Notes
- #2: Intro, who we are, about our program, two typical installations
- #3: One AF is approx 326,000 gallons
- #8: CDPH's Title 17 of Code of Regulations says Premises having auxiliary water supply must have cross-connection control油(1) Auxiliary Water Supply is any water supply other than that received from a public water system.油(2) Premises where there is an unapproved auxiliary water supply and there are not interconnections with the public water system, a double check may be provided in lieu of a reduce pressure device if approved by the Health agency and water supplier.油(3) Backflow preventer shall be tested at least annually or more frequently if determined to be necessary by the water supplier.
- #15: Part physical water savings, part heightening of customer awareness
- #18: 107kgal/summer savings. $622/yr System cost: $6550