本文讨论了作者开发的一个计算机模型（NET），该模型模拟了水在管网中分布时的传播路径和随后发生的水质变化。通过使用计算机模型模拟各种更新选项，可以生成预期改进程度与更新方法的评分。本文介绍了两项研究，以说明如何使用该模型对市政配电网（余氯分配）和三层公寓楼（铅积累问题）的升级方案进行评级。

This paper discusses a computer model (NET) developed by the author, which simulates the travel paths and subsequent water quality changes that occur as water distributes through a pipe network. By simulating various update options with the computer model, a rating of expected degree of improvement versus update approach may be generated. Two studies are presented to illustrate how this model can be used to rate upgrade options for a municipal distribution network (chlorine residual distribution) and a three story apartment building (lead build- up problems).