Abstract: The purpose of this paper was to analyse the relationship between crack width and deformation of various diameters of concrete sewer pipes. The differences between classification of longitudinal cracks and deformation were demonstrated. It was noted that the horizontal diameter of deformed pipe changes more than the vertical diameter. In addition, it was proved that the crack of the same width leads to various magnitude of deformation depending on the diameter of pipe, therefore it affects differently on sewer collapse risk. This fact should be taken into account in longitudinal cracks classification by assuming different crack width tresholds for various pipe diameters. It was pointed out that the relationship between these defects should be taken into account in assessment the impact of longitudinal cracks and deformation on sewer pipe condition.
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