A Water Distribution System (WDS) that is structurally inadequate needs to be rehabilitated in order to restore the required performance. The latter is a function mainly of the water requested by users supplied and by the topological scheme of the network. In order to contribute to identifying which rehabilitation solution could lead to a lower systemic risk of not supplying the water required, together with a lower rehabilitation cost, in this work a study of the influence of the topologic scheme on the performance of the network is analyzed. In particular the loop redundancy and the robustness of the network scheme is investigated by applying an optimization technique based on evolutionary algorithms and taking into account the water required at each node by the users. The objectives of the optimization problem are the minimization of the total rehabilitation costs (sum of the structural costs and lost revenue costs) and the minimization of system risk. The latter is defined as being the product of the probability of failure in satisfying the water demand and the consequence of this failure, i.e. the total volume of water not delivered. Water demands are considered as uncertain parameters due to the inherent difficulties involved in their estimation and they are modelled by means of probability density functions estimated in experimental studies conducted on real water distribution networks. The methodology presented has been applied to the same network characterized by four configurations with different redundancy and relevant conclusions are drawn considering the influence of the topological network on system reliability/risk.
The Influence of Network Topology on Water Distribution System Performance
Tricarico C.;Gargano R.;de Marinis G.;
2012-01-01
Abstract
A Water Distribution System (WDS) that is structurally inadequate needs to be rehabilitated in order to restore the required performance. The latter is a function mainly of the water requested by users supplied and by the topological scheme of the network. In order to contribute to identifying which rehabilitation solution could lead to a lower systemic risk of not supplying the water required, together with a lower rehabilitation cost, in this work a study of the influence of the topologic scheme on the performance of the network is analyzed. In particular the loop redundancy and the robustness of the network scheme is investigated by applying an optimization technique based on evolutionary algorithms and taking into account the water required at each node by the users. The objectives of the optimization problem are the minimization of the total rehabilitation costs (sum of the structural costs and lost revenue costs) and the minimization of system risk. The latter is defined as being the product of the probability of failure in satisfying the water demand and the consequence of this failure, i.e. the total volume of water not delivered. Water demands are considered as uncertain parameters due to the inherent difficulties involved in their estimation and they are modelled by means of probability density functions estimated in experimental studies conducted on real water distribution networks. The methodology presented has been applied to the same network characterized by four configurations with different redundancy and relevant conclusions are drawn considering the influence of the topological network on system reliability/risk.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
