In water distribution systems (WDSs), the available flow at a demand node is dependent on the pressure at that node. When a network is lacking in pressure, not all consumer demands will be met in full. In this context, the assumption that all demands are fully satisfied regardless of the pressure in the system becomes unreasonable and represents the main limitation of the conventional demand dr...

In the field of water distribution systems the EPANET 2 toolkit is considered nowadays the industry standard for hydraulic modelling. Unfortunately, the design and programming model of EPANET 2 have some limitations that make any attempt to extend its hydraulic solver, add new functionalities or improve performance difficult to achieve and time consuming. A new software toolkit for water distri...

The optimisation of pump operations in water distribution networks is an ongoing research topic motivated by the great energy savings that a careful scheduling of pumps may achieve. State-of-the-art approaches often combine an optimisation algorithm, such as Evolutionary Algorithms, and full hydraulic simulation. Despite the advances in optimisation techniques and hardware performance, the time...

Several indices have been used in the past for the assessment of the performance of water distribution systems. In this paper the performance of water distribution systems is evaluated using the resilience index and the failure index proposed by Todini (2000). The method is demonstrated through the analysis of a real world application, the water distribution system of the town of Sofades in Cen...

In this paper, an evolutionary algorithm, called EA-WDND, is developed to optimize water distribution network design for real instances. The evolutionary algorithm uses the Epanet Solver which, while not an optimizer, helps to evaluate the operational constraints of mass conservation, energy conservation, pressure in nodes (nodal heads) of the network, and velocities of water in network pipes. ...

RESUME. Pour parvenir à illustrer l’utilité des SIG dans le domaine de l’alimentation en eau potable, nous nous sommes proposés d’élaborer un modèle de données SIG pour les réseaux d’eau potable de la SONEDE. La création de ce modèle est faite à partir de l’analyse des fiches d’informations élaborées par la société pour la collecte des données sur le terrain. Après sa validation par le gestionn...

The hypothesis of this research was that under some conditions, monochloramine cometabolism causes disinfectant loss in distribution systems, and is a defense mechanism that allows nitrifiers to persist in pipe-wall biofilm. The research objectives were to (1) define the relative significance of monochloramine cometabolism in causing disinfectant loss over the typical range of conditions encoun...