1996年，辛辛那提水厂（CWW）启动了一项冲洗试验计划，以评估替代冲洗技术单向冲洗（UDF）在降低浊度和客户投诉方面的有效性。UDF包括通过有组织、有顺序地关闭适当的阀门和打开适当的消防栓来隔离干管的特定部分，以形成单一方向的水流。系统地冲洗干管的各个部分，以确保水从清洁的水源逐渐流向系统的外围，从大型干管流向小型干管，从清洁的干管流向肮脏的干管。据报道，UDF具有更高的清洗效率和长期效益，并且比传统冲洗用水更少。试验计划分两个阶段进行:低速阶段，然后是高速阶段，以评估通过提高冲洗速度获得的额外效益。 在研究期间，对试验区的水质参数和客户投诉进行了监测。

In 1996, Cincinnati Water Works (CWW) initiated a flushing pilot program to evaluate the effectiveness of an alternative flushing technique, unidirectional flushing (UDF), in terms of reducing turbidity and customer complaints. UDF consists of isolating specific sections of main by closing appropriate valves and opening appropriate hydrants in an organized and sequential manner in order to create a single direction of water flow. The sections of main are flushed systematically to ensure that water flows progressively from a clean source to the periphery of the system, from large to small mains, and from clean to dirty mains. UDF reportedly has greater cleaning efficiency, longer term benefits, and uses less water than conventional flushing. The pilot program was conducted in two phases: a low velocity phase followed by a high velocity phase performed to evaluate additional benefits gained through increased flushing velocity. Water quality parameters and customer complaints from the pilot area were monitored thoughout the study.