Advantages of the Event Method for the Simulation of Water Quality in Pressurised Water Systems

Abstract

In this paper, several methods for the calculation of water quality evolution in drinking water distribution networks are analysed. The Lagrangian Time-Driven method has been implemented in the Epanet simulation software since version 2.0. In version 2.2, some improvements were implemented to deal with mass imbalances (Lagrangian Time-Driven improved method). However, it sometimes presents inaccuracies in calculations, especially when there are short-length pipes. To solve this problem, the implementation of the Lagrangian Event-Driven method is proposed, which provides more accurate quality results. In order to detail the differences and similarities of the results of the different methods and to determine under what conditions the results provided by Epanet are sufficiently adjusted, two practical examples have been carried out, one of them on a hydraulic model of a real network.

Analysis of the Evolution of Water Quality in Tanks according to the Connections and Operation Mode. Application to the most Suitable Design

“…Hydraulic models followed by WQ models are necessary to determine travelling times, water age, blending, and subsequent WQ throughout the system by considering the various water travelling paths and quality transformations. It is impossible to accurately determine these factors without the use of such models [4][5][6].…”

Analysis of the Evolution of Water Quality in Tanks According to the Connections and Operation Mode: Application to the Most Suitable Design

“…Hydraulic models followed by WQ models are necessary to determine travel times, water age, blending, and subsequent WQ throughout the system by considering the various water travel paths and quality transformations. It is impossible to accurately determine these factors without the use of such models [4][5][6].…”