ABSTRACT
Flexible polymeric sewer linings restore system integrity by arresting infiltration into a cracked pipe. Structural design of these linings is dominated by their ability to resist an external head of groundwater. Existing procedure in this regard is first summarised and shown to be conservative. A programme of research aimed at addressing these issues is then described. In particular the techniques being used to undertake material evaluation, mathematical modelling, and representative system testing are presented, and the results obtained to date are summarised.
