Investigation into the pressure-driven extension of the EPANET hydraulic simulation model for water distribution systems

Seyoum, Alemtsehay G. and Tanyimboh, Tiku T. (2016) Investigation into the pressure-driven extension of the EPANET hydraulic simulation model for water distribution systems. Water Resources Management. ISSN 0920-4741 (https://doi.org/10.1007/s11269-016-1492-6)

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Abstract

Several hydraulic modelling approaches have been proposed previously to simulate pressure deficient operating conditions in water distribution networks more realistically. EPANET-PDX is an extension of EPANET 2 that has an embedded logistic nodal head-flow function. The EPANET-PDX algorithm was investigated to address the weaknesses uncovered under conditions of extremely low pressure. It was observed that, under certain circumstances, the norm of the system of equations increased from one iteration to the next. A criterion that detects false convergence was included. In general, in the examples considered, the formulation proposed had more consistent computational properties, required fewer iterations of the global gradient algorithm, and application of the line minimization procedure was frequent. The formulation proposed is significantly faster in conditions of extremely low pressure. The hydraulic and water quality modelling functionality of EPANET 2 was preserved. For the operating conditions with satisfactory pressure, where direct comparisons with EPANET 2 were possible, EPANET 2 was consistently faster.

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