The wastewater collection network in metropolitan Adelaide consists of a large number of assets distributed over a wide geographic area. This poses significant challenges in both conducting and prioritising asset management activities for these assets, including maintenance, rehabilitation, condition assessment and replacement.

United Water has met these challenges in a cost-effective manner by developing prioritisation models utilising the functionality of GIS and InfoNet. The wastewater collection system in Adelaide includes over 80,000 wastewater access chambers, termed ‘manholes’, and 900 sewer vent stacks, commonly known as ‘educt vents’. To conduct condition assessments for every manhole and educt vent in wastewater networks was not a financially viable option, and would not effectively manage risk. It was therefore decided to develop theoretical prioritisation models for the manholes and educt vents, to ensure that the assets with the highest risk of failure were identified for targeted condition assessment. Expert models were developed using GIS and InfoNet software packages after an extensive review of available techniques and programs. The models were used to identify the assets, which would theoretically be in the worst condition. Results of the model predictions have been encouraging, indicating a good correlation between theoretical condition ratings and known problem areas. This work has highlighted the importance of GIS and InfoNet software packages as powerful asset management decision-making tools. Click here to read more