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Design & Implementation of Harvested Water in Buildings

Design & Implementation of Harvested Water in Buildings. Shah Smith & Associates, Inc. June 2009. Why Harvest Water?. Limited Resource Water Conservation Texas’s population is expected to nearly double between 2000 and 2050 (Texas Water Development Board, 2002).

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Design & Implementation of Harvested Water in Buildings

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  1. Design & Implementation of Harvested Water in Buildings Shah Smith & Associates, Inc. June 2009

  2. Why Harvest Water? • Limited Resource • Water Conservation • Texas’s population is expected to nearly double between 2000 and 2050 (Texas Water Development Board, 2002). • Can assist in acquiring up to 7 LEED points. (LEED 2009, 3v) • Credits • SS 6.1, Reduce the quantity of stormwater runoff • WE 1, Reduce potable water use for irrigation • WE 2, Reduce potable water use for building sewage conveyance

  3. Why Harvest Water? • Property Tax Exemption • For commercial installations of water conserving equipment (TWDB, 2005). • Municipal Incentives (residential) • Austin • San Antonio

  4. Why Harvest Water? • Texas House Bill 4 (80th legislative session) • As of Sept. 01, 2009 all new state buildings are required to have on-site reclaimed system technologies, including rainwater harvesting, condensate collection, or cooling tower blow down, or a combination there of, for nonpotable indoor use and landscape watering. • Administered by SECO (State Energy Conservation Office) http://www.legis.state.tx.us/

  5. Sources of Water for Reuse • Gray water • Waste water discharged from lavatories, bathtubs, showers, clothes washers and laundry trays (IPC 2006). • Reclaimed Water • Water that, as a result of tertiary treatment of domestic wastewater by a public agency, is suitable for a direct beneficial use or a controlled use that would not otherwise occur (UPC 2006). • Harvested Rainwater • Collected rainwater from a roof, driveway, other hard surface. HVAC condensate can be included with a rainwater harvesting system.

  6. Applicable Codes • International Plumbing Code (Appendix C) • Uniform Plumbing Code (Chapter 16) **Must Confirm with Authority Having Jurisdiction**

  7. System Components • Collection Vault / Tank • Filtration • Pump • Expansion Tank • Disinfection • Piping • Acid Neutralizer • Dye Injectors • Back Flow Preventer Disclaimer The use of brand name products in this presentation does not indicate an endorsement by Shah Smith & Associates, Inc.

  8. Typical System Flow Diagram • Fully Engineered Systems • OR • Packaged Systems

  9. Underground Tanks

  10. Aboveground Tanks

  11. Underground Liner Vaults

  12. Pumps

  13. Filtration • Automatic Self-Cleaning Filter • Cartridge Filter

  14. Disinfection Germicidal UV Light Chlorine Injection

  15. UV Disinfection • Advantages • Effective against viruses, spores, and cysts • Physical process • No residual affects • Short contact time • Small space requirement • Disadvantages • Dosage is not precise • Organisms can repair themselves • Preventative maintenance required • High turbidity can reduce effectiveness

  16. Chlorine Disinfection • Advantages • Effective against pathogens • Well-established technology • Cost effective • Residual continues to disinfect • Accurate dosing control • Eliminates odors • Disadvantages • Harmful to aquatic life • Handling of toxic and corrosive material • Long-term environmental effects unknown • Some parasitic species are chlorine resistant

  17. Piping and Signage According to UPC 2006, signs must be provided in: Restrooms, Equipment rooms, Valve access doors, Valve seals, Piping, Storage Tanks

  18. Dye Injector

  19. Backflow Preventer • TWDB recommends a reduced pressure zone back flow preventer on any domestic water backup.

  20. Cross-Connection Test • A cross-connection test must be performed in the presence of the Authority Having Jurisdiction. • Used to insure no cross-contamination exist between the potable water system and the nonpotable water system.

  21. Guideline Resource http://www.twdb.state.tx.us/publications/reports/RainwaterHarvestingManual_3rdedition.pdf

  22. Acknowledgments and Works Cited • Clemes, Roger W. Company: Bob J. Johnson & Assoc., Inc. Luis A Rivera. 11 June 2009. • International Plumbing Code. International Code Council, Inc., 2006. • LEED Ref. Guide of Green Building Design and Construction. U.S. Green Building Council, 2009. • Puente, Robert. Texas House Bill #4. 2007. • Rainwater Harvesting Potential and Guidelines for Texas. Austin: Texas Water Development Board, 2006. • The Texas Manual on Rainwater Harvesting. Austin: Texas Water Development Board , 2005. • Uniform Plumbing Code. International Association of Plumbing and Mechanical Officials, 2006. • Wastewater technology Fact Sheet: Chlorine Disinfection. Washington, D.C.: US Environmental Protection Agency, 1999. • Wastewater Technology Fact Sheet: Ultraviolet Disinfection. Washington, D.C.: US Environmental Protection Agency, 1999.

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