A comparative study on a hydraulic and water-quality analysis method for determining rechlorination injection points for a water-supply network

Sang Myoung Lee, Ho Min Lee, Do Guen Yoo, Joong Hoon Kim

Research output: Contribution to journalArticle


Water supply facilities are vulnerable to extremeweather events, such as droughts and floods. To establish a sustainable solution that resists accidents and disasters, a distributed system is required. To supply high-quality tap water using the existing water-supply network, rechlorination facilities must be installed to secure residual chlorine at the pipe end. In this study, a process is developed to determine the injection points and dosages of rechlorination using the latest pressure-driven analysis. The method was compared to the results of demand driven analysis methods. The proposed model was applied to P City in Korea to draw results. A detailed evaluation was performed to study how water pressure head and demand-based hydraulic and water quality analysis results impact the injection points and dosages of rechlorination. Thus, the existing demand-based model shows significant spatial deviations in the pressure head in the presence of water pressure drops, which subsequently lead to over-estimation of chlorine injection dosages for maintaining the concentration of residual chlorine. However, the proposed model involves a numerically validated theory and draws more reasonable results for hydraulic, water quality, and rechlorination dosages. The proposed model can be used as a decision-making tool based on hydraulic analysis for the supply of water of a stable quality.

Original languageEnglish
Article number697
JournalWater (Switzerland)
Issue number4
Publication statusPublished - 2019 Apr 1



  • Hydraulic analysis
  • Pressure-driven analysis
  • Rechlorination facility
  • Residual chlorine
  • Water quality analysis
  • Water supply network

ASJC Scopus subject areas

  • Biochemistry
  • Geography, Planning and Development
  • Aquatic Science
  • Water Science and Technology

Cite this