水行业主要关注净化水的质量和 在客户处改善水质时，配送资产的物理状况 水龙头然而，输送的水的质量也会受到水保留时间的影响 在分销网络的不同元素中。本文介绍了已经完成的工作 在正在进行的AwwaRF研究项目#2769:评估的第一阶段进行 管理分配系统水质的保留时间。 该报: 确定受停留时间影响的水质参数； 总结了可用于调查保留时间问题和 通过对23家公用事业公司的国际调查结果评估其利用率； 介绍了在供应系统内调整保留时间的方法； 和 概述了保留时间管理的系统方法； 这项工作的总体结论是，保留时间是一种有效的记忆方式 控制一些水质参数。然而，需要一种结构化的方法来解决这个问题 帮助公用事业公司选择适合其重要性的分析工具和控制措施 数据和资源的问题和可用性。这种方法正在开发和实施中 在该项目的第二阶段进行了测试。 包括44个参考文献和表格。

The water industry has focused predominantly on the quality of treated water and the physical condition of distribution assets when improving the quality of water at the customer's tap. However the quality of the water delivered is also affected by the time the water is retained in the different elements of the distribution network. This paper presents work which has been undertaken in the first phase of the ongoing AwwaRF research project #2769: Evaluating Retention Time to Manage Distribution System Water Quality. The paper: identifies the water quality parameters which are affected by retention time; summarizes the analysis tools available to investigate retention time problems and assesses their utilization via the results of an international survey of 23 utilities; presents methods by which retention time can be adjusted within supply systems; and, outlines a systematic approach to retention time management; The overall conclusion of the work is that retention time is an effective means of controlling some water quality parameters. However, there is a need for a structured approach to help utilities select analysis tools and control measures that are appropriate to the significance of the problem and availability of data and resources. Such an approach is being developed and tested in Phase 2 of this project. Includes 44 references, tables.