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The minimal operation time of new designed water supply network pipelines is
50 years. The necessity of periodical rehabilitation of pipelines is caused
by structure changes of their endurance due to actions of numerous external and
internal factors. Currently, there are several rehabilitation methods, including both
traditional and unconventional methods. Each pipe rehabilitation should be firstly
preceded by a comprehensive evaluation of a chosen technology and its financial
profitability. One of many project’s evaluation tools is a multi-criteria decision
analysis.
The paper presents an exemplary multi-criteria decision analysis of a water
supply pipeline rehabilitation. The analysed pipeline was a fragment of a water
supply system of a small town in Lublin Voivodeship. Two different
unconventional rehabilitation methods were analysed: static cracking and horizontal
directional drilling. Additionally, a conventional excavation-based method was also
evaluated. Each of the rehabilitation variants was analysed by five main criteria,
which were respectively weighted. The criteria weights were established in
accordance to the most important issues – financial costs (weight: 31%), needed
time (25%) and ecological (20%), social (14%) and technical (10%) aspects. Every
criterion was further divided into sub-criteria. In accordance to weighted criteria,
the general mark of each of examined renovation method was calculated.
As the result of executed analysis, the method of horizontal directional drilling
was defined as the most advantageous. That method was evaluated with the highest
general mark, but also with the highest mark among four of five main criteria.
The executed analysis can be very helpful during the decision process, due to the
fact that the selection of a chosen method can be supported with rational reasons.
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