在配水系统的表面上，生物膜通常以相对较高的密度生长。配水系统中存在生物膜并不一定表明净化水的质量在传输过程中受到影响。这种薄膜可以是单层的，也可以是由构成薄膜的细菌分泌的额外聚合材料。关于流型对生物膜密度的影响知之甚少。特别令人感兴趣的是那些由于使用有限而保持低流量条件的配水系统部分。本研究旨在确定在存在和不存在游离余氯的情况下，不同流态对系统死角中可培养生物膜和浮游细菌的影响。包括8个参考文献、图表。

Biofilms are commonly found growing at relatively high densitieson surfaces within water distribution systems. The presence of biofilms within a distribution system does not necessarily indicate that the quality of the treated water has been compromised during transmission. Such films may be in monolayers or held within extra polymeric materials secreted by the bacteria which make up the film. Relatively little is known regarding the effect of flow regimes on biofilm densities. Of particular interest are those sections of a water distribution system which maintain low flow conditions due to limited use. This study was designed to determine the effects of varying flow regimes on culturable biofilms and planktonic bacteria in system dead ends in the presence and absence of free chlorine residual. Includes 8 references, figures.