Cal Poly San Luis Obispo Water Conservation Best Water Conservation Best Practices Practices UC/CSU/CCC Sustainability UC/CSU/CCC Sustainability Conference Conference UCSB UCSB June 24-27, 2007 June 24-27, 2007 Presented by Presented by Dennis K. Elliot, PE Dennis K. Elliot, PE Manager of Engineering and Utilities Manager of Engineering and Utilities
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Cal Poly San Luis Obispo Water Conservation Best Practices
Cal Poly San Luis Obispo Water Conservation Best Practices. UC/CSU/CCC Sustainability Conference UCSB June 24-27, 2007 Presented by Dennis K. Elliot, PE Manager of Engineering and Utilities. Cal Poly San Luis Obispo Water Conservation Best Practices. Low Flow Fixture Retrofits of over: - PowerPoint PPT Presentation
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Cal Poly San Luis ObispoCal Poly San Luis ObispoWater Conservation Best PracticesWater Conservation Best Practices
Cal Poly San Luis ObispoCal Poly San Luis ObispoWater Conservation Best PracticesWater Conservation Best Practices
• Total project cost $238,000Total project cost $238,000• Water savings:Water savings: 39,000 CCF or 29 Million gal per year - 15% of 39,000 CCF or 29 Million gal per year - 15% of campus totalcampus total Approx 25,000 gal per fixtureApprox 25,000 gal per fixture• Utility cost savings $240,000 per yearUtility cost savings $240,000 per year @$3/ccf for water, $3/ccf for sewer@$3/ccf for water, $3/ccf for sewer
Cal Poly SLO Annual Potable Water Usage
100,000
120,000
140,000
160,000
180,000
200,000
220,000
240,000
260,000
280,000
02/03 03/04 04/05 05/06
Total Water Usage, CCF
Cal Poly San Luis ObispoCal Poly San Luis ObispoWater Conservation Best PracticesWater Conservation Best Practices
Waterless vs. Ultra Low FlowWaterless vs. Ultra Low Flow
Waterless pros & cons:Waterless pros & cons:• Zero water usage saves 45,000 gpyZero water usage saves 45,000 gpy• More housekeeping requiredMore housekeeping required• Oil seal replacementOil seal replacement• Do not pour water down drain!Do not pour water down drain!• Cartridge replacementCartridge replacement• Supply piping still required by codeSupply piping still required by code
Cal Poly San Luis ObispoCal Poly San Luis ObispoWater Conservation Best PracticesWater Conservation Best Practices
Waterless vs. Ultra Low FlowWaterless vs. Ultra Low Flow
• 1/8 gpf achieves 90% of waterless 1/8 gpf achieves 90% of waterless savingssavings
• Less housekeeping requiredLess housekeeping required
• No oil seal or cartridge replacementNo oil seal or cartridge replacement
• Works well with sensored flush valvesWorks well with sensored flush valves
Cal Poly San Luis ObispoCal Poly San Luis ObispoWater Conservation Best PracticesWater Conservation Best Practices
LEED EB Pilot ProjectLEED EB Pilot ProjectFaculty Office East Building - Faculty Office East Building -
20,000 gsf20,000 gsf• Retrofit all fixtures to ULF, Retrofit all fixtures to ULF, sensoredsensored• 1/8 gpf Zurn urinals1/8 gpf Zurn urinals• 0.5 gpm sensored faucets0.5 gpm sensored faucets• Will achieve 60% reduction in Will achieve 60% reduction in usageusage• Qualifies for two LEED points for Qualifies for two LEED points for water efficiency – Credit 3.1 and water efficiency – Credit 3.1 and 3.23.2• Project cost $15,000Project cost $15,000• Payback period 8 yearsPayback period 8 years
Cal Poly San Luis ObispoCal Poly San Luis ObispoWater Conservation Best PracticesWater Conservation Best Practices
Other Conservation EffortsOther Conservation Efforts
• Management of boilers, cooling Management of boilers, cooling towers, water softeners, closed towers, water softeners, closed loopsloops
Cal Poly San Luis ObispoCal Poly San Luis ObispoWater Conservation Best PracticesWater Conservation Best Practices
Unexpected Consequences:Unexpected Consequences:
• Increased concentration of Increased concentration of regulated substances in effluent regulated substances in effluent to city.to city.
Cal Poly San Luis ObispoCal Poly San Luis ObispoWater Conservation Best PracticesWater Conservation Best Practices
Unexpected Benefits:Unexpected Benefits:
• Conservation eliminated need Conservation eliminated need for previously projected future for previously projected future sewer capacitysewer capacity• Resulted in $2M savings to Resulted in $2M savings to Poly Canyon Village Housing Poly Canyon Village Housing projectproject• Funds returned to project to Funds returned to project to help pay for additional help pay for additional sustainability featuressustainability features
Cal Poly San Luis ObispoCal Poly San Luis ObispoWater Conservation Best PracticesWater Conservation Best Practices