Abstract
The Ministry of Electricity and Water (MEW), as well as other water authorities all over the world, is facing a difficult challenge in assessing the physical condition of its distribution systems. Since the majority of the mains are buried, the MEW must rely upon indirect methods, including analysis of repair records. A case study on Kuwait’s water distribution system using the techniques of survival analysis is analyzed and investigated for modeling the pipe break failures. The proportional hazard model has the advantage of being able to separate the effects of component deterioration on failure due to aging from the effects of site‐specific causes. Another desirable feature is its ability to analyze censored data. The sensitivity of the model parameters to sample size and percent censoring is examined through random sampling of the database. In addition, the proportional hazard model is suitable for describing failure rates of components.
Highlights
Kuwait is located at the north western shore of the Arabian Gulf. is location is categorised as an arid region, which is marked by very scarce rainfall, high temperatures and evaporation rates, and a lack of perennial surface waters
It covers an area of 18,000 km2. e average annual rainfall ranges from 40 to 240 mm, and the total annual evaporation rate ranges from 2,500 mm in the coastal areas to more than 4,500 mm inland
In addition to distilled freshwater, Kuwait has a large supply of brackish groundwater. e Ministry of Electricity and Water (MEW) in Kuwait distributes the brackish water to the consumers through a separate network parallel to the freshwater network
Summary
File cabinets at hundreds of water utilities are bulging with records of failed pipes, joints, valves, and pumps This reservoir of information has not been efficiently tapped to estimate parameters that are useful for maintenance and repair decisions. Is location is categorised as an arid region, which is marked by very scarce rainfall, high temperatures and evaporation rates, and a lack of perennial surface waters E Ministry of Electricity and Water (MEW) in Kuwait distributes the brackish water to the consumers through a separate network parallel to the freshwater network. Since the majority of the mains are buried, the MEW must rely upon indirect methods, including analysis of repair records. e time to failure of a component is represented as a random variable, T > 0, with a probability density function f(t) and a distribution function F(t). e
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