The importance of distribution systems is quite obvious considering the fact that generally
between 60 and 80 percent of the capital investment (or utility plant) in a utility is allocated to the
distribution, or delivery, of finished water. Water mains are the key component of a distribution
system, and represent the largest capital investment. Distribution systems have a direct impact on
customers, as problems arising from distribution systems are the source of most customer
complaints. Potable water pipeline systems deteriorate over time, with the rate of deterioration being
influenced by a number of factors such as pipe age, water quality, structural loading, soil
conditions, and operating conditions. Historically, the level of maintenance (in terms of
rehabilitation or replacement) carried out on distribution system mains has been relatively low
compared to that for treatment facilities. The fact that mains are located underground and
therefore 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.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 130 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 13 |
| Published : | 01/01/2000 |
