Understanding the Most Common Structural Defects in Sewer Networks
In sewer networks, many critical issues remain invisible until they lead to major consequences, such as infiltration of clear water, exfiltration of wastewater, ground subsidence, or structural failures. At the root of these problems are almost always the same causes: structural defects that develop over time or originate during construction. Understanding these defects is essential for better targeting inspections, prioritizing interventions, and extending the lifespan of infrastructure.
Why Do Structural Defects Occur?
Underground networks are constantly exposed to various stresses. Soil pressure, surface traffic, temperature fluctuations, and aggressive chemical environments all contribute to weakening materials over time. In some cases, installation defects or poor material choices further accelerate deterioration. Over time, these combined factors create weak points that become critical areas within the network. These degradations are often the root cause of infiltration and exfiltration, directly impacting both network performance and the environment.
The Most Common Structural Defects
Cracks
Cracks are among the most common defects in sewer networks. They can result from material aging, soil movement, or mechanical stress. Even small cracks are enough to allow external water to enter the system or wastewater to escape into the surrounding environment.
Defective Joints
Joints ensure watertight connections between pipe sections and at manholes. Over time, they can deteriorate, shift, or lose their effectiveness.
These defects are a major source of both infiltration and exfiltration, especially in manholes, which are particularly exposed and vulnerable.
Corrosion
Corrosion is a common issue in sewer environments, particularly due to gases such as hydrogen sulfide (H₂S). It gradually weakens pipe and manhole walls, reducing their structural integrity and eventually leading to perforations or collapses.
Deformation and Settlement
Structural deformations can be caused by excessive loads, unstable soils, or improper installation. These issues lead to misalignment and additional stress on materials, accelerating overall network deterioration.
Construction Defects
Some defects are present from the very beginning. Poor alignment, unsuitable materials, or inadequate installation practices can create structural weaknesses from day one. Over time, these initial flaws become critical points that contribute to infiltration and leakage.
Defects That Are Difficult to Detect Without Inspection
Most of these defects are not visible from the surface. Without proper inspection, they can evolve for years before being detected—often when it is already too late. Traditional methods involving confined space entry are not only time-consuming and costly, but also pose significant safety risks to operators.
The Value of 360° Inspection Technologies
Modern inspection solutions, such as the RV-MAX 360 by RinnoVision, now make it possible to detect these defects quickly and safely. With high-definition 360° video capture, operators can visualize entire structures in just a few minutes—without requiring confined space entry. This approach enables immediate identification of cracks, joint defects, corrosion, and structural deformations, while improving team safety and reducing inspection costs.
Move Toward Smarter Inspection
Structural defects are at the core of infiltration and exfiltration issues in sewer networks. Early detection is essential to prevent major damage, reduce costs, and protect the environment. By leveraging advanced inspection technologies, network operators can adopt a more proactive, faster, and more efficient approach. A better understanding of defects starts with better inspection. With RinnoVision, you can transform your operations by adopting a fast, safe, and data-driven solution.
Request a demo of the RV-MAX 360 today.