Design & Design & Implementation of Implementation of

Harvested Water in Harvested Water in BuildingsBuildings

Shah Smith & Associates, Inc.

June 2009

Why Harvest Water?Why Harvest Water? Limited ResourceLimited Resource Water ConservationWater Conservation

Texas’s population is expected to nearly double Texas’s population is expected to nearly double between 2000 and 2050 (Texas Water between 2000 and 2050 (Texas Water Development Board, 2002).Development Board, 2002).

Can assist in acquiring up to 7 LEED points. Can assist in acquiring up to 7 LEED points. (LEED 2009, 3v)(LEED 2009, 3v) CreditsCredits

• SS 6.1, Reduce the quantity of stormwater runoff SS 6.1, Reduce the quantity of stormwater runoff • WE 1, Reduce potable water use for irrigation WE 1, Reduce potable water use for irrigation • WE 2, Reduce potable water use for building sewage WE 2, Reduce potable water use for building sewage

conveyanceconveyance

Why Harvest Water?Why Harvest Water?

Property Tax Exemption Property Tax Exemption For commercial installations of water conserving For commercial installations of water conserving

equipment (TWDB, 2005).equipment (TWDB, 2005).

Municipal Incentives (residential)Municipal Incentives (residential) AustinAustin San AntonioSan Antonio

Why Harvest Water?Why Harvest Water? Texas House Bill 4 (80Texas House Bill 4 (80thth legislative session) legislative session)

As of Sept. 01, 2009 all new As of Sept. 01, 2009 all new state buildingsstate buildings are are required to have on-site reclaimed system required to have on-site reclaimed system technologies, including rainwater harvesting, technologies, including rainwater harvesting, condensate collection, or cooling tower blow condensate collection, or cooling tower blow down, or a combination there of, for nonpotable down, or a combination there of, for nonpotable indoor use indoor use andand landscape watering. landscape watering.

Administered by SECO (State Energy Administered by SECO (State Energy Conservation Office) Conservation Office)

http://www.legis.state.tx.us/

Sources of Water for ReuseSources of Water for Reuse Gray waterGray water

Waste water discharged from lavatories, bathtubs, showers, Waste water discharged from lavatories, bathtubs, showers, clothes washers and laundry trays (IPC 2006).clothes washers and laundry trays (IPC 2006).

Reclaimed WaterReclaimed Water Water that, as a result of tertiary treatment of domestic Water that, as a result of tertiary treatment of domestic

wastewater by a public agency, is suitable for a direct beneficial wastewater by a public agency, is suitable for a direct beneficial use or a controlled use that would not otherwise occur (UPC use or a controlled use that would not otherwise occur (UPC 2006).2006).

Harvested RainwaterHarvested Rainwater Collected rainwater from a roof, driveway, other hard surface. Collected rainwater from a roof, driveway, other hard surface.

HVAC condensate can be included with a rainwater harvesting HVAC condensate can be included with a rainwater harvesting system.system.

Applicable Codes Applicable Codes International Plumbing Code (Appendix C)International Plumbing Code (Appendix C)

Uniform Plumbing Code (Chapter 16)Uniform Plumbing Code (Chapter 16)

**Must Confirm with Authority Having Jurisdiction** **Must Confirm with Authority Having Jurisdiction**

System ComponentsSystem Components Collection Vault / TankCollection Vault / Tank FiltrationFiltration PumpPump Expansion TankExpansion Tank DisinfectionDisinfection PipingPiping Acid NeutralizerAcid Neutralizer Dye InjectorsDye Injectors Back Flow PreventerBack Flow Preventer

DisclaimerDisclaimerThe use of brand name products in The use of brand name products in

this presentation does not indicate an this presentation does not indicate an endorsement by Shah Smith & endorsement by Shah Smith &

Associates, IncAssociates, Inc..

Typical System Flow DiagramTypical System Flow Diagram

•Fully Engineered SystemsFully Engineered Systems OROR•Packaged SystemsPackaged Systems

Underground TanksUnderground Tanks

Aboveground TanksAboveground Tanks

Underground Liner Vaults Underground Liner Vaults

PumpsPumps

FiltrationFiltration

Automatic Self-Automatic Self-Cleaning FilterCleaning Filter

Cartridge FilterCartridge Filter

DisinfectionDisinfection

Germicidal UV Light Germicidal UV Light Chlorine Injection Chlorine Injection

UV DisinfectionUV Disinfection Advantages Advantages

Effective against viruses, spores, and cystsEffective against viruses, spores, and cysts Physical processPhysical process No residual affectsNo residual affects Short contact time Short contact time Small space requirementSmall space requirement

DisadvantagesDisadvantages Dosage is not preciseDosage is not precise Organisms can repair themselvesOrganisms can repair themselves Preventative maintenance requiredPreventative maintenance required High turbidity can reduce effectiveness High turbidity can reduce effectiveness

Chlorine DisinfectionChlorine Disinfection AdvantagesAdvantages

Effective against pathogens Effective against pathogens Well-established technologyWell-established technology Cost effectiveCost effective Residual continues to disinfectResidual continues to disinfect Accurate dosing controlAccurate dosing control Eliminates odorsEliminates odors

DisadvantagesDisadvantages Harmful to aquatic lifeHarmful to aquatic life Handling of toxic and corrosive materialHandling of toxic and corrosive material Long-term environmental effects unknownLong-term environmental effects unknown Some parasitic species are chlorine resistantSome parasitic species are chlorine resistant

Piping and SignagePiping and Signage

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

Dye InjectorDye Injector

Backflow PreventerBackflow Preventer TWDB recommends a reduced pressure zone TWDB recommends a reduced pressure zone

back flow preventer on any domestic water back flow preventer on any domestic water backup.backup.

Cross-Connection TestCross-Connection Test

A cross-connection test must be A cross-connection test must be performed in the presence of the Authority performed in the presence of the Authority Having Jurisdiction.Having Jurisdiction.

Used to insure no cross-contamination Used to insure no cross-contamination exist between the potable water system exist between the potable water system and the nonpotable water system. and the nonpotable water system.

Guideline ResourceGuideline Resource

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

Acknowledgments and Works Cited Acknowledgments and Works Cited Clemes, Roger W. Clemes, Roger W. Company: Bob J. Johnson & Assoc., Inc.Company: Bob J. Johnson & Assoc., Inc. Luis A Rivera. 11 June 2009. Luis A Rivera. 11 June 2009.

International Plumbing Code.International Plumbing Code. International Code Council, Inc., 2006. International Code Council, Inc., 2006.

LEED Ref. Guide of Green Building Design and Construction.LEED Ref. Guide of Green Building Design and Construction. U.S. Green Building Council, U.S. Green Building Council, 2009.2009.

Puente, Robert. Puente, Robert. Texas House Bill #4.Texas House Bill #4. 2007. 2007.

Rainwater Harvesting Potential and Guidelines for Texas.Rainwater Harvesting Potential and Guidelines for Texas. Austin: Texas Water Development Austin: Texas Water Development Board, 2006.Board, 2006.

The Texas Manual on Rainwater Harvesting.The Texas Manual on Rainwater Harvesting. Austin: Texas Water Development Board , 2005. Austin: Texas Water Development Board , 2005.

Uniform Plumbing Code.Uniform Plumbing Code. International Association of Plumbing and Mechanical Officials, International Association of Plumbing and Mechanical Officials, 2006.2006.

Wastewater technology Fact Sheet: Chlorine Disinfection.Wastewater technology Fact Sheet: Chlorine Disinfection. Washington, D.C.: US Washington, D.C.: US Environmental Protection Agency, 1999.Environmental Protection Agency, 1999.

Wastewater Technology Fact Sheet: Ultraviolet Disinfection.Wastewater Technology Fact Sheet: Ultraviolet Disinfection. Washington, D.C.: US Washington, D.C.: US Environmental Protection Agency, 1999.Environmental Protection Agency, 1999.