维护分销系统的完整性对于保护客户至关重要 公共卫生。然而，配电系统中的压力波动可能会导致瞬态故障 低压或负压的时期。在这些期间，供水受到污染 可能由于外部水侵入配电系统而发生。以前的 抽样研究表明，配水管周围的水可能含有多种污染物 微生物病原体，因此表明饮用水污染 可能通过这条路线。 本文介绍了美国水务协会研究基金会实地调查的结果。 “现场测试喘振模型预测，以验证喘振的发生”项目 配电系统压力监测数据来自多个方面 显示持续时间如下的负瞬态压力事件发生的配电系统 长约40-50秒（其中一秒可能长达2.75分钟），以及 检测到的压力低至负10 psi。停电导致的泵故障是主要原因 唯一已知的观察到的负压原因。然而，其中一个原因是负面的 未发现与泵压力相关的事件。 包括4个参考文献、图表。

Maintaining the integrity of the distribution system is of utmost importance in protecting public health. However, pressure surges in distribution systems can result in transient periods of low or negative pressures. During these periods contamination of the water supply may potentially occur due to intrusion of outside water into the distribution system. Previous sampling studies have shown that water surrounding distribution pipes can contain a variety of microbiological pathogens, thus suggesting that contamination of drinking water is possible through this route. This paper presents results from the field investigation phase of the American Water Works Association Research Foundation research project on "Field-Testing of Surge Modeling Predictions to Verify Occurrence of Distribution System Intrusion". Pressure monitoring data is presented from various distribution systems showing the occurrence of negative transient pressure events lasting as long as approximately 40-50 seconds (with one possibly as long as 2.75 minutes), and pressures were detected as low as negative 10 psi. Pump failure from power outages was the only known cause of the observed negative pressures. However, the cause of one negative pressure event was not identified but does not appear related to pump operation. Includes 4 references, figures.