Problems with clogging in pressure distribution systems have been reported (Shoemaker et al. 1987, Hoover et al. 1991) and can result in system failure, increased maintenance, and limited use of appurtenances such as timers. Therefore, Maryland sought a pressure distribution network design that would allow operation without clogging and reduce the need for maintenance.
For this study we closely monitored sixty-one systems designed and installed according to the Maryland procedure. We attempted to measure pressure head and discharge rates at each system. We then developed a methodology for estimating degree of clogging. We found that while most systems had some degree of clogging, the clogging had not yet required the need for increased maintenance. However, some operational problems found indicate a need for increased maintenance and inspection and a need to revise our design and construction procedure.
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