PLEASE BE AWARE THAT THE OCTOBER LUNCHEON IS BEING HELD ON A DIFFERENT DAY THAN USUAL. WE WILL HAVE THE LUNCHEON ON WEDNESDAY, NOVEMBER 1, 2017.
AWRA Colorado Section Presents
Wednesday November 1st, 2017
Trends and spatial distribution of surface water chloride concentration, the potential corrosivity of water distribution systems, and linkages to lead contamination of drinking water
Corrosion in water-distribution systems is a costly problem and controlling corrosion is a primary focus of efforts to reduce lead (Pb) and copper (Cu) in tap water. High chloride concentrations can increase the tendency of water to cause corrosion. The effects of chloride are also expressed in several indices commonly used to describe the potential corrosivity of water. Despite the known importance of chloride, and the chloride-based indicators of potential corrosivity, monitoring of seasonal and interannual changes in these parameters is not common among water purveyors. We analyzed long-term trends (1992-2012) and the current status (2010-2015) of chloride and several indicators of potential corrosivity in order to describe the short and long-term temporal variability in potential corrosivity of US streams and rivers. The probability of Pb action-level exceedances (ALEs) in drinking water facilities increased along with chloride-based indicators of potential corrosivity, indicating a statistical connection between surface water chemistry and corrosion in drinking water facilities. Increases in these parameters were common and particularly acute in urbanized areas. Strong correlations also existed between the degree of watershed urbanization, chloride concentration and indicators of potential corrosivity. However, individual sites sometimes showed high variability in potential corrosivity, emphasizing the central role of water quality monitoring in order to achieve optimal corrosion control.
Ted Stets, Research Ecologist with the U.S. Geological Survey in Boulder Colorado.
Ted Stets is a Research Ecologist with the U.S. Geological Survey in Boulder Colorado. He got his PhD at the University of Minnesota in 2007 and began working at the USGS as a post-doc in 2007. Ted studies water quality and biogeochemistry in streams and rivers. The work he will be presenting today is part of the USGS National Water Quality Assessment Surface Water Trends Team and is looking at changes in water quality and how they interact with the potential for lead contamination of drinking water.
|Brown Bag Lunch and Networking at 12:00,
Program at 12:15
Location: Leonard Rice Engineers
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We will not be ordering lunch for this event. Please feel free to “brown-bag” it.
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