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A drone river inspection for underground canals
# Drone Inspection of an Underground Canal System
## Key Benefits at a Glance
When dealing with complex urban infrastructure like underground canals, traditional inspection methods often fall short. Here’s why using a drone like the Elios 3 can make all the difference:
- **Accessibility**: With only outdated 2D maps as our guide, we successfully navigated the Elios 3 through these underground canals during low tide. These tunnels had likely not been accessed since their construction, making it a high-risk endeavor for humans. The drone provided us safe access and the ability to conduct a thorough inspection.
- **Data Quality**: The inspection yielded crisp visual data in the form of photos and videos, along with a detailed LiDAR scan. This level of detail exceeded the client’s expectations and went beyond the initial mission scope without any extra effort.
- **Safety**: Sending personnel into such environments is extremely risky due to unpredictable water levels and strong currents. The Elios 3 eliminated these dangers entirely, allowing us to gather critical data without endangering lives.
- **Efficiency**: What might have taken days of preparation and multiple setups with conventional methods was completed in just one day. The drone’s capabilities drastically reduced the time and resources required.
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## Planning a Drone Inspection for an Urban Waterway
Sater, a division of the SARP Group under Veolia, specializes in water and wastewater management across France. With three decades of experience, they tackle some of the most challenging inspection tasks in the industry. Recognizing the potential of drone technology to enhance safety and efficiency, Sater invested in an Elios 3 drone to augment their inspection toolkit.
Recently, Sater deployed the Elios 3 in Rouen to inspect underground canals prior to a major construction project. The site, located beneath the Marché d’Intérêt National (MIN), features two parallel conduits that channel water into the Seine River. Before proceeding with surface-level development, the client needed assurance about the structural integrity of these submerged conduits.
This task presented unique challenges. Not only were the tunnels inaccessible to divers due to strong currents and unknown variables, but tidal fluctuations further complicated scheduling. The Seine is tidal up to the first lock at Amfreville-Poses, meaning timing was crucial to ensure safe drone operation.
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## Conducting the Drone Inspection
The Sater team relied solely on historical blueprints since these canals hadn’t been inspected since their construction. The inspection occurred in early April, timed meticulously to coincide with the lowest possible tidal coefficient. Each conduit measured 3 meters in diameter, and access points were limited to openings just 2 x 3 meters wide, spaced approximately every 50 meters along the canal’s 540-meter route.
Using the Elios 3, our pilots navigated through these tight spaces, capturing both visual and LiDAR data. The drone’s LiDAR capability proved particularly valuable, generating a highly accurate 3D model of the tunnels. Despite needing only visual footage, this digital representation will serve as a vital reference for future maintenance and record-keeping.
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## Delivering Exceptional Results
Our primary goal was to deliver clear video documentation of the canal interiors. However, the LiDAR scans came as an unexpected bonus, offering the client unprecedented insights into the tunnels’ geometry. The resulting 3D model provided a comprehensive view of the infrastructure, eliminating the need for hazardous human intervention.
[](http://bsg-i.nbxc.com/blog/68b4dbb7162a1ea410ae779444659f18.png)
*The detailed LiDAR scan allowed us to visualize the tunnels accurately, even in areas obstructed from direct view.*
This mission not only satisfied the client’s requirements but also showcased the Elios 3’s versatility and reliability. For Sater, it marked another milestone in leveraging advanced technology to solve complex problems. Without the Elios 3, collecting this data safely would have been nearly impossible.
In conclusion, this project underscored the importance of adopting innovative solutions in urban water management. By embracing cutting-edge tools like the Elios 3, companies like Sater can lead the way in balancing progress with sustainability while keeping workers safe.