# Drone Inspection of Underground Canals for River Management
## Key Benefits at a Glance
In a world where urban water systems demand constant vigilance, the Elios 3 drone emerged as a game-changer for accessing and inspecting underground canals. Here’s why:
- **Accessibility**: With only outdated 2D maps as a reference, our team successfully navigated the Elios 3 through low-tide conditions to explore underground canals that hadn’t seen human entry since their construction. This drone river inspection proved invaluable.
- **Data Excellence**: The inspection delivered crystal-clear visuals—photos, videos—and a detailed LiDAR scan that exceeded expectations. The data collected was comprehensive and went beyond the initial mission scope without any extra effort.
- **Safety First**: Sending humans into such environments is fraught with danger due to unpredictable water levels and strong currents. The Elios 3 eliminated these risks entirely.
- **Time Efficiency**: What traditionally takes days of preparation and setup was accomplished in just one day. This drastic reduction in time underscores the drone’s efficiency.
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## Planning a Drone Inspection for an Urban Waterway
Sater, a division of the SARP group under Veolia based in northern France, specializes in water and wastewater management. With over three decades of experience, they’ve honed their expertise in navigating challenging environments. Recognizing the potential of drones like the Elios 3, they integrated this technology to ensure safer inspections across their projects.
Recently, Sater faced a critical task in Rouen. The city’s Marché d'Intérêt National (MIN) required an inspection of underground canals prior to proposed surface construction. These canals, running parallel beneath multiple structures, needed thorough evaluation for structural integrity before proceeding. Divers were ruled out due to the hazardous tidal conditions, while conventional ROVs posed risks of getting trapped. The Elios 3 became the obvious choice.
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## Navigating the Depths with Precision
The canals, two parallel tunnels each three meters wide, stretch 540 meters underground. Access points were limited, with openings only 2x3 meters wide, and manholes spaced every 50 meters. Historical charts provided the sole guidance, as these canals hadn’t been inspected since their creation.
The inspection was scheduled for early April, timed precisely to coincide with the lowest tidal coefficients. Flying the Elios 3 at low tide allowed us to access these otherwise unreachable areas. The drone’s LiDAR capabilities complemented its visual data, creating a 3D model of the canals that was both accurate and insightful.
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## Delivering Exceptional Results
Our client expected video footage of the canals, but the accompanying LiDAR scans proved to be an unexpected bonus. The municipality was thrilled with the precision of the 3D models, which offered a complete view of the pipes without endangering personnel. This visualization not only satisfied immediate needs but also provided a valuable resource for future urban planning.
For Sater, this mission marked a significant milestone. By leveraging the Elios 3, we demonstrated the potential for even more ambitious projects. Traditional methods simply cannot match the safety, speed, and detail achieved by drone inspections. This project underscored our commitment to innovation and excellence in urban water management.
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The Elios 3 has redefined how we approach complex inspections. It’s not just about data collection—it’s about safety, efficiency, and pushing boundaries.
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