The structural condition of rigid sewer pipes: a statistical investigation

This paper describes a statistical analysis of the structural condition of rigid sewer pipes. The aim of the study was to identify the factors that have most influence on a sewer's structural condition. A statistical investigation, in the form of a logistic regression analysis, was performed on an extensive data set that combined a number of previously disparate data sources. The study would suggest that there are a large number of variables which are significant in assessing the risk of a sewer collapsing or deteriorating to such an extent that collapse is likely. The analysis described contributes significantly to the small amount of work of this nature previously completed.