蒙特利尔配水系统根据标高分为6个压力区。这是通过关闭阀门来实现的，因此在阀门的每一侧都会产生死端条件。本研究的目的是记录定期冲洗死胡同位置的益处。具体目标是:评估定期堵头冲洗的短期变化（第24天、第7天）和长期影响（1年），并描述堵头位置累积的松散沉积物的特征。在压力区#4的平行街道上选择了两个类似的采样点。氯在夏季以0的目标水平注入。 位于内日海岸（CDN）储罐出口的高压泵上的6-0.9 mg Cl2/L。根据水力模拟，储罐出口和死端位置入口之间的平均停留时间约为7至10小时。在三个月的时间里，每周在出口CDN水箱和直接安装在管道上的取样口对水质进行取样。常规监测包括浊度、总铁、温度、pH值、HPC、大肠菌群和直接总计数。包括10个参考文献、表格和图表。

The Montreal distribution system is divided into 6 pressure zones according to elevation. This is done by closing valves, therefore creating dead-end conditions on each side of the valve. The objective of this study was to document the benefits of periodically flushing the dead-end locations. Specific objectives were: to evaluate the short-term variations (24th, 7d) and long term impact (1 yr.) of periodical deadend flushing, and to characterize the loose deposits accumulated in dead-end locations. Two similar sampling sites were chosen on parallel streets in the pressure zone #4. Chlorine is injected during summer at a target level of 0.6-0.9 mg Cl2/L on high-pressure pumps located at the outlet of the Cote-des-Neiges (CDN) storage tank. Mean residence time between the outlet of the tank and the inlet of the dead-end locations is about 7 to 10 hours according to hydraulic simulations. Water quality was sampled on a weekly basis over a 3 month period at the outlet CDN tank and at sampling ports installed directly on the pipes. Routine monitoring included turbidity, total iron, temperature, pH, HPC, coliforms and direct total counts. Includes 10 references, table, figures.