Simulation of water distribution network with an intermittent water supply and analysing availability of residual chlorine

Abstract

The intermittent nature of water supply in certain regions presents challenges in maintaining water quality and ensuring the appropriate level of disinfection. To address this issue, a simulation approach is utilized to model the dynamics of water flow, chlorine decay, and demand patterns within the distribution network. In modelling of intermittent water supply schemes (IWSSs) it is essential to consider partial/no flow condition and high water demand during initial filling stage to fill consumer storage tanks. The modified pressure dependent analysis was used to model the WDN. Through the development of a comprehensive simulation model, this study present variation of residual chlorine level within an IWS. By considering factors such as water demand variations, network topology, availability of storage facilities, the proposed simulation model provides a systematic framework for hydraulic modelling of an intermittent water supply systems. Modelling was carried out using the Bentley WaterGEMS software with the aid of ArcGIS platform and Ahangama water supply scheme in Sri Lanka where, intermittent water supply provided in alternate days used as the area for implementing the proposed methodology. The findings of this study are expected to contribute to the enhancement of water quality and quantity management practices in intermittent supply contexts, ultimately leading to improved public health outcomes and sustainable water distribution network operations.