As an UKWIR BQ2 (Zero Leakage) and BQ3 (Zero Interruptions) collaboration, a series of workshops were held in the summer of 2021.  Four interrelated topics were discussed virtually by water companies, their contractors and the supply chain.   Innovative methods were used for gathering and sharing data, insight and opinion in order to disseminate valuable learning and knowledge in relatively short timescales to the appropriate industry areas. 

Failures on trunk mains are relatively low in frequency they can, however, cause significant disruption. This report details the outputs of both a practitioner workshop and associated industry surveys and examines current practices of preventing and mitigating trunk mains failures and good practice recommendations.

Trunk Mains Preventative Maintenance to Reduce Major Incident Risk Workshop - Appendix C - Practitioners Guide