AWWA DSS63725

This slide presentation outlines a case study at the Dallas Water Utilities where a water quality event in the summer of 2004 occured. Complaints of colored water and low chlorine residual caused the utility to evaluate whether certain process changes were having an impact in mixing zones.EPS modeling was used for evaluating the water quality in the distribution system. Water age, source trace, mixing zones, and pipe materials are presented. Observations included:no clear relationship between mixing zones andunresolved colored water complaints;a prevalence of unlined pipe exists in the vicinityof the unresolved color complaint locations;it is likely that modified distribution system waterchemistry between Bachman and EastsideWTPs precipitated iron out of unlined pipes; and,reversed flow direction when Bachman wasplaced back on line may have precipitated iron. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

09/01/2006

Number of Pages:

21

File Size:

1 file , 3.2 MB