Full Description

The East Bay Municipal Utility District (the District) supplies water treatmentfor twenty communities in Alameda and Contra Costa Counties in California.Approximately 1.1 million people are served by the District's water system. Thewater distribution system includes five water treatment plants, over 150 pumpingplants, over 160 storage reservoirs and over 3,950 miles of distributionpipelines. These pipelines range in size from 2 inches to 96 inches and arecomprised of a number of materials including steel, polyvinyl chloride (PVC),cast iron (CI), asbestos-cement (AC), and ductile iron (DI). Some of the pipe inthe system is over 90 years old and the median age is 31 years. The systemexperienced two significant growth periods, one in the 20s and 30s and the nextin the 50s and 60s. Pipe installed during the first period was predominately CI,without lining and coating. The AC and CI pipelines make up the highestpercentages of pipe material in the system at 29% and 38% respectively andrepresent some of the oldest pipe. The DI pipe is responsible for 80% of theleaks. The District was concerned that the DI pipe will start displaying afailure frequency that is a function of its age. This paper will explain themethodology the District has developed to determine how much pipe it needs toreplace to keep annual leak rates constant and the methods used to decide whichpipelines should be replaced each year. Includes figures.

Product Details

Edition: Vol. - No. Published: 01/01/2000 Number of Pages: 10File Size: 1 file , 750 KB