Water Transmission Main Asset Management Plan

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The District owns and maintains over 53 miles of water transmission mains. These transmission mains are large pipes (16" in diameter and larger) which are designed to move large quantities of water from the source of supply, such as a treatment plant or groundwater well, to the smaller distribution mains.

As part of ongoing asset management efforts, a Water Transmission Main Asset Management Plan (WTMAMP) was prepared. This WTMAMP inventoried the District's existing transmission mains in terms of size, type of pipe and age and outlines a plan for monitoring and testing and potential repair, rehabilitation and/or replacement.

Fortunately, the District's transmission mains are generally newer pipes within the system. About 80% of the transmission mains are less than 20 years of age. The average useful life of water transmission mains is estimated to be between 70 and 120 years depending on the pipe material and other factors. These larger mains also typically have corrosion protection systems in place to further increase their life expectancy. However, they are also the largest and most expensive pipes to replace.

The WTMAMP is intended to be a tool for ongoing communication between the Board and staff to prioritize water transmission main assessment, rehabilitation or replacement. Furthermore, it will be used as a planning tool during the annual capital improvement program (CIP) budget discussions with the Board. This Plan does not represent a financial commitment by the Board, other than those CIP funds already in the District's approved budget.

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