作者描述了一项实地研究，研究了水力混合对配水系统水质变化的影响。该研究在北宾夕法尼亚水务局进行（平均产量为5 mgd，配水管长度为225 mi），该研究纳入了一个现场取样计划，该计划使用了定制的自动取样器，旨在防止挥发性成分的损失。作为对现场采样计划的补充，研究并开发了预测配水系统水质变化的计算机模型。显然，需要获得比通常从配电系统采样获得的更具代表性的监测结果。包括36个参考文献、表格、图表。

The authors describe a field study that examined the effects of hydraulic mixing on water quality variations in a distribution system. Conducted at the North Penn Water Authority (average production of 5 mgd and 225 mi of distribution pipe), the study incorporated a field sampling program that utilized customized automated samplers designed to prevent loss of volatile constituents. As a complement to the field sampling program, computer models that would predict water quality variations in distribution systems were examined and developed. A clear need was shown for obtaining more representative monitoring results than are normally acquired from distribution system sampling. Includes 36 references, table, figures.