计算机软件的最新发展现在提供了建立代表性模型的能力，该模型可以模拟动态流动条件下水质参数（如消毒剂或污染物）的传播和浓度。Severn Trent Water正在为多种配水系统类型开发氯浓度模型，并建立模型制作和校准的标准方法。本文介绍了方法学、应用、氯衰变建模、氯和残余模型应用。经过良好校准的水力模型和新的计算机程序设施相结合，提供了生成动态水质模型并将其应用于实际操作情况的能力。 建立余氯模型的方法已经成功。

Recent developments in computer software now provide a capability to build representative models which can simulate the propagation and concentration of water quality parameters, such as disinfectants or contaminants, in dynamic flow conditions. Severn Trent Water is developing chlorine concentration models for a number of water distribution system types and establishing standard methodologies for model production and calibration. This paper describes methodology, applications, modeling chlorine decay, chlorine and residual model application. The combination of well calibrated hydraulic models and new computer program facilities provides a capability for producing dynamic water quality models and applying them in practical operational situations. The methodology developed to create a chlorine residual model has been successful.