Advanced Multi-Sensor Inspection Critical Condition Assessment on Wastewater Infrastructure

SewerVUE Technology (SewerVUE) was subcontracted by Whissell Contracting and the city of Calgary to inspect two critical sanitary trunks located under Memorial Drive in Calgary, Alberta, Canada. Measurements of sediment levels, structural defects, and wall thicknesses of approximately 600 linear meters of 1,200 mm I.D. and 1,950 mm I.D. R.C.P. were taken. An advanced multi-sensor robotic float equipped with HD closed circuit television (CCTV), sonar, and 3D Light Detection and Ranging (LiDAR) was used. Quantifications of the staining and sediment deposits throughout the pipe were reported along with joints and wall loss. Equipped with this data, the city of Calgary and its engineers can make evidence-based decisions regarding the pipes’ rehabilitative needs. This case study demonstrates the use of advanced pipe condition assessment technologies as a cost-effective, non-destructive means to refine the estimated remaining useful life (RUL) of an interceptor, accurately determine the overall severity of pipe degradation, and provide a basis for improved cost allocation or timing of rehabilitation efforts.