即使水质符合最严格的标准 根据规定，水分配系统永远不能 没有颗粒或微生物。微粒 材料以松散沉积物的形式在分布中积累 系统由几个机制组成。一些 对水质的不利影响与 网络中存在松散沉积物，包括大肠菌群 以及消费者投诉。 本文的目的是评估这种程度 中国配电系统中的松散沉积物堆积 三个加拿大城市确定最佳冲洗频率。 在本研究中，松散颗粒的数量和性质 单向冲洗（UDF）过程中清除的沉积物 程序有文件记录，处理水的作用 速率特性和网络配置 确定了松散堆积物。 数据收集和结果分析 通过UDF获得的数据被发现对水利设施有用 因为它使实用程序能够描述 使用相对简单的协议的UDF程序的效率， 评估药物的潜在不良影响 水质上再悬浮的松散沉积物，以及 阅读网络的现状。合二为一 练习（冲洗和分析程序） 有效性）是决策中的有用工具- 制作 维护操作的过程，尤其是在 实施这项计划后的头几年 操作和维护程序。包括31个参考文献、表格、图表。

Even if water quality complies with the most stringent regulations, water distribution systems can never be free of particles or microorganisms. Particulate materials accumulate as loose deposits in distribution systems as a result of several mechanisms. A number of adverse effects on water quality are associated with the presence of loose deposits in networks, including coliforms and consumer complaints. The objective of this article was to evaluate the extent of loose deposit accumulation in distribution systems in three Canadian cities to determine optimal flushing frequency. In this study, the quantity and nature of loose deposits removed during unidirectional flushing (UDF) procedures is documented and the role of treated water characteristics and network configuration on the rate of loose deposit accumulation is identified. The collection of data and the analysis of the results obtained by UDF was found to be useful to water utilities because it enables utilities to characterize the efficiency of UDF programs with relatively simple protocols, evaluate the potential adverse effects of resuspended loose deposits on water quality, and read the current situation of the network. The combined practice (flushings and analyzing the procedure effectiveness) can be a useful tool in the decision-making process of maintenance operations, especially during the first years following the implementation of this operations and maintenance procedure. Includes 31 references, tables, figures.