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Abstract
A reliability model RELWNET has been developed to evaluate the reliability of water distribution networks based on the load-resistance concept. RELWNET is a probabilistic model that applies the generic expectation functions developed by Tyagi & Haan (2001). The probability distributions for load and resistance have been estimated by randomly generating the input variables for the hydraulic capacity of pipes and nodal demands equations using the built-in random functions in MATLAB. The failure probability distribution of the whole system has been determined by applying the k th order of moments developed by Haan (1977) to the load-resistance reliability equation. The model RELWNET is coded in MATLAB and is linked to the hydraulic model EPANET2 (Rossman, 1993) to define the risk components by applying pipe closure combination based on the minimum cut-sets. The validation of the model is demonstrated using an example water network reported by Su et al (1987). It is concluded the model RELWNET has proven its ability to complete a reliability evaluation for a small example water distribution network.
Additional information
Notes on contributors
M A Moneim
Dr Mohamed A. Moneim is a principal Civil Engineer in the Water Department at GHD Global Consulting Firm. He received his BSc in Civil Engineering at 1990 from Ain Shams University, Egypt. He got his Masters degree in the field of hydraulics and water quality analysis for water distribution networks in 2000 from Cairo University, Egypt. He received his PhD degree in the field of reliability and optimisation of water distribution networks in 2009 from Al-Azhar University. His research areas include water and wastewater networks, water quality analysis, hydraulic and surge analysis, and optimisation and reliability for water distribution networks. He has worked as a water and wastewater designer with international consultants in the Middle East and Australia. He is a graduate member of ICE. He has submitted his application to register with Engineers Australia.
A K Moawad
Dr Ahmed Moawad is an associate professor at Al-Azhar University Faculty of Engineering, Egypt. He received his BSc from Ain Shams University, Egypt, in 1986. He received his Masters degree in civil engineering from the University of Windsor, Canada, in 1993. He received his PhD in the field of civil and environmental engineering from the University of Alberta, Canada, in 1998. He has been working also as a consultant engineer. His research areas include water and wastewater distribution and treatment systems, water quality, and environmental hydraulics.
A El-Molla
Dr Anas El-Molla is a professor at Al-Azhar University Faculty of Engineering. He received his BSc and MSc degrees from Al-Azhar University, Egypt, in 1976 and 1982, respectively. He received his PhD in the field of hydraulics and irrigation through a channel system between University of Manchester Institute of Science and Technology, UK, and Al-Azhar University in 1990. He has been working also as a consultant engineer in the field of civil and environmental engineering since 1992. His research areas include hydraulics, irrigation, groundwater hydraulics, water distribution systems, water quality and environmental hydraulics.
M A ElSalawy
Dr Mohammed Ayman ElSalawy is a professor at Al-Azhar University Faculty of Engineering, Egypt. He received his BSc from Al-Azhar University in 1973. He received his MSc degree in civil engineering from Ain Shams University, Egypt, in 1982. He received his PhD in the field of hydraulics and irrigation from Al-Azhar University in 1988. He has been working also as a consultant engineer in the field of civil and environmental engineering since 1988. His research areas include hydraulics, irrigation, groundwater hydraulics, water distribution systems, water quality and environmental hydraulics.