为了控制配水系统中的水质，必须知道各种化合物在任何给定点的停留时间和浓度。SAFEGE开发的软件PICCOLO可以模拟网络中的停留时间。软件中添加了一个模块，该模块集成了游离氯的建模。本文对模型进行了详细的技术描述。

To control water quality in the distribution system, one must know the residence time and the concentration of various compounds at any given point. A software, PICCOLO, developed by SAFEGE, makes it possible to model residence time in the network. Added to the software is a module that integrates the modeling of free chlorine. This paper describes the models in technical detail.