Risk Assessment of Transmission Water Mains to Support Efficient Rehabilitation Decisions

Franz Friedl, Daniela Fuchs-Hanusch

Publikation: Beitrag in Buch/Bericht/KonferenzbandBeitrag in einem KonferenzbandBegutachtung

Abstract

Transmission water mains constitute a very important part of a water distribution
system. The failures in the major transmission mains system may lead to severe
supply interruptions and incur significant repair costs and costs at third parties, as
large quantity of water are lost due to large diameters. Hence, the network
segments, which have the highest failure risk, have to be identified to provide
avoidance strategies at time. According to the described initial situation in
practice only low failure rates are accepted for transmission water mains.
Statistical failure prediction methods, based on recorded failure data, as they are
used in pipe rehabilitation decision support tools for supply networks, are
inapplicable. To deal with this problem, a specific risk assessment method has
been applied to support maintenance and rehabilitation decisions under these
circumstances. A multi-criteria index, named failure risk index (FRI), has been
derived. The index allows a rating, identification and comparison of transmission
water mains with respect to their failure risk. The index combines three
components of risk which are the probability of occurrence of a failure, the
severity of the consequences and the probability of detection. Each of the
components is represented by the interaction of a number of factors, which are
weighted towards each other expressed by their relating characteristics. The
probability of occurrence of a failure is derived from the combination of stresses
and strains that are expected to impact the investigated pipe segments. Therefore
in a pre-step of the analyses the system specific impacts on failure occurrence are
investigated in detail, by taking all failures into account, which have occurred so
far. For the second component, the severity of a failure is based on a monetary
valuation of damage and supply interruptions. The probability of detection is
derived from differences in leak localization campaign frequencies. The analyses
were applied to an Austrian water distribution system
Originalspracheenglisch
TitelInnovations in the Field of Water Supply, Sanitation and Quality Management
Seiten270-279
PublikationsstatusVeröffentlicht - 2011
Veranstaltung1st Danube - Black Sea Regional Young Water Professional Conference - Palace of Parliament, Bucharest, Rumänien
Dauer: 14 Juni 201115 Juni 2011

Konferenz

Konferenz1st Danube - Black Sea Regional Young Water Professional Conference
Land/GebietRumänien
OrtBucharest
Zeitraum14/06/1115/06/11

Fields of Expertise

  • Sustainable Systems

Treatment code (Nähere Zuordnung)

  • Application
  • Theoretical

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