State Water Resources Research Institute Program

Project Id: 2010TX356B
Title: Trihalomethane Formation Potential in Rainwater Harvested from Different Roofing Materials
Project Type: Research
Start Date: 3/01/2010
End Date: 2/28/2011
Congressional District: 21
Focus Categories: Treatment, Water Quality, Water Supply
Keywords: Rainwater quality, rainwater harvesting, roof runoff, sustainable water supply
Principal Investigators: Mendez, Carolina B; Kinney, Kerry A; Kirisits, Mary Jo
Federal Funds: $ 5,000
Non-Federal Matching Funds: $ 10,000
Abstract: Rainwater harvesting systems are one way to address the worldwide increase in water demand. Although rainwater harvesting systems may be simple and inexpensive to construct, various sources of contamination can negatively affect water quality. Currently, we are sampling five pilot-scale roofs (asphalt fiberglass shingle, Galvalume® metal, concrete tile, cool, and green) at the Lady Bird Johnson Wildflower Center in Austin, Texas to examine the effect of roofing material on harvested rainwater quality. Preliminary data show that harvested rainwater contains 2-37 mg/L dissolved organic carbon (DOC). If the harvested rainwater is for indoor use, it must be disinfected. If it is disinfected with chlorine, the presence of DOC can lead to the formation of harmful disinfection by-products such as trihalomethanes (THMs). The main purpose of the proposed work is to examine the trihalomethane formation potential (THMFP) of rainwater harvested from the pilot-scale roofs constructed of five different roofing materials.

Progress/Completion Report, 2010, PDF

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