AWWA INF52159

The importance of distribution systems is quite obvious considering the fact that generallybetween 60 and 80 percent of the capital investment (or utility plant) in a utility is allocated to thedistribution, or delivery, of finished water. Water mains are the key component of a distributionsystem, and represent the largest capital investment. Distribution systems have a direct impact oncustomers, as problems arising from distribution systems are the source of most customercomplaints. Potable water pipeline systems deteriorate over time, with the rate of deterioration beinginfluenced by a number of factors such as pipe age, water quality, structural loading, soilconditions, and operating conditions. Historically, the level of maintenance (in terms ofrehabilitation or replacement) carried out on distribution system mains has been relatively lowcompared to that for treatment facilities. The fact that mains are located underground andtherefore are invisible often hides the need for maintenance and investment. Recently, however, there has been an increased focus on the strategic rehabilitation/replacement of distribution systems as well as meeting the on-going repair requirements. The objective of developing a capital program for main rehabilitation/replacement is to minimize supply problems related to system deterioration and to enhance system reliability. This paper presents the basic steps a utility can take to develop a capital program for the rehabilitation/replacement of its water mains. The procedures that are described have been utilized at United Water Resources operating companies to develop capital planning programs. Includes table, figures.

Product Details

Edition:

Vol. - No.

Published:

01/01/2000

Number of Pages:

13

File Size:

1 file , 130 KB