A CCTV inspection identified a significant issue within a fiber-reinforced concrete (FRC) stormwater pipe in Moreton City, Queensland, Australia. Two protruding PVC connections from a new residential property had penetrated the pipe's obvert, the highest point on the inside of the pipe, often called the "ceiling". The protrusions extended approximately 150 millimeters into the pipe's diameter.
These penetrations posed a serious threat particularly during heavy rainstorms. "There is an increased risk of flooding and damage," says William Wong, APAC Business Development Manager for pipe repair. "When rainwater flows through the pipe the obstacles obstruct the flow causing water to potentially flood the surrounding area."
Risks and Complications
The obstructions also created a high potential for severe blockages. "Debris, leaves and other materials may accumulate around obstacles leading to partial or complete blockage of the pipe potentially creating backups," Wong continues.
Beyond this the structural integrity of the entire system was at risk. "Erosion and undermining can happen when water flowing through obstacles erodes soil around the pipe. This can weaken the storm pipe’s foundation making it instable and increasing the chance of collapse," explains Wong.
