Modeling Local Water Storages Delivering Customer Demands in WDN Models

作者：Giustolisi O^*; Berardi L; Laucelli D

来源：Journal of Hydraulic Engineering, 2014, 140(1): 89-104.

DOI：10.1061/(ASCE)HY.1943-7900.0000812

• Water distribution systems
• Hydraulic networks
• Simulation
• Hydraulic models
• Water storage
• Water demand
• Tank modeling
• Water distribution networks
• Hydraulic network modeling
• Water distribution network simulation
• Extended period simulation

Water distribution network (WDN) models account for customer-demands as water withdrawals concentrated in nodes. Customer-demands can be assumed to be constant or varying with nodal head/pressure entailing demand-driven or pressure-driven simulation, respectively. In both cases, the direct connection of customer properties to the hydraulic system is implicitly assumed. Nonetheless, in many technical situations, the service pipe fills a local private storage (e.g.,a roof tank or a basement tank) from which the water is actually delivered to customers by gravity or pumping systems. In such contexts, the service pipe fills the local tank by means of a top orifice. Consequently, what is really connected to the hydraulic system is a tank, which is subject to a filling/emptying process while supplying water to customers. Therefore, since modeling this technical situation in WDN analyses is necessary, the paper develops a formulation for nodal water withdrawals in WDN models accounting for the filling/emptying process of inline tanks between the hydraulic network and customers. The formulation is also introduced in a widely used method for steady-state WDN modeling, the global gradient algorithm, and its effectiveness to increase the hydraulic accuracy of results is discussed using a simple case study and a small network.

• 出版日期2014-1-1