INFLUENCE OF CONGESTION COSTS ON THE MID-TERM REHABILITATION PLANNING OF DRINKING WATER PIPELINES
Gangl, G.1, Fuchs-Hanusch, D.1, Fellendorf, M.2
1Graz, University of Technology , Institute of Urban Water Management and Water Landscape Engineering, Austria
2Graz, University of Technology, Institute of Highway Engineering and Transportation Planning, Austria
(free)
In case of a pipeline failure a decision has to be made about repair or renewal. So far this decision is
purely based on cost of the construction site; thus repairing is favoured in many situations. If additional
items and their associated costs would be considered, a foresighted planned rehabilitation will become
more advantageous in many cases. Additional items influencing the total cost of repairing versus
renewal incorporate volume of water loss prior to detection of a lack, hygienic aspects like the
possibility of infiltration and transportation. If a faulty pipeline is laid below a roadway or an adjacent
sidewalk both repairing and renewal will reduce the available road space and thus influence the traffic
flow. In this paper we estimate the cost induced by traffic congestion for different urban configurations.
It will be shown that renewal of a pipeline should be considered after the 4th or 5th failure.
KEY-WORDS
Middle term rehabilitation, traffic congestion costs, optimal time for rehabilitation
