AWWA ACE69068

Failures on water mains have several negative consequences including disruption of service tocustomers, damage to the roadway, other nearby infrastructure and sometimes private property,alternative supply of water and detouring of traffic during repairs, financial cost of repairs,increased (albeit slight) risk of contamination in the water distribution system, and the conditionsripe for another failure when the main is re-pressurized. Customers' highly variable tolerance toservice disruption, the high cost of water main replacement and the need for sustainability makefor tough decisions by the utility manager. The dates and locations of failures however, providea considerable amount of information about the condition of the pipe and the likely time betweenfuture failures. The authors present a statistical model for estimating the performance of eachcategory of pipe to date. Segment level analysis uses the performance model to determine theeconomically optimum threshold for the replacement of each pipe in the network. Network levelanalysis then allows the analyst to forecast funding needs in relation to meeting the economicand service level objectives for the network. The effect of two co-variates, pipe length and pipediameter, on the performance model is presented, as is the effect of different levels of service onthe long-term funding needs. Includes 4 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2008

Number of Pages:

47

File Size:

1 file , 1.3 MB