Exfiltration from sewers - Is it a serious problem?

D. Blackwood, D. J. Gilmour, J. B. Ellis, D. M. Revitt & A. Stainess
This paper contends that estimates of exfiltration leakage from sewers, and the problems arising from it may be too high due to an underestimation of the \342\200\234self-repairing\342\200\235 action of sewage and sewage sediments in raw sewage. Two aspects of a continuing programme of research are reported; (i) the measurement of exfiltration rates from a range of defects in a sewer pipe with pipe bedding effects simulated by a dry gravel trench surround to the pipe,...
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