Safely Surveying Subterranean Wastewater, Surface Water, and Sewer Systems with LiDAR-Equipped UAV Technology
At DJM Aerial Solutions, we regularly receive requests to inspect subterranean culvert systems that are completely inaccessible using traditional methods. These typically include wastewater, surface water, or combined sewer culverts, often buried under critical infrastructure or in locations where years of sediment build-up, debris, and poor access have rendered conventional survey approaches like CCTV crawlers or pipe robots ineffective.
Where manned entry would once have been the only alternative—bringing with it major hazards including exposure to disease, toxic gases, unknown collapse risk, and full confined space procedures—we now deploy the Elios 3 drone. This advanced inspection system eliminates human exposure entirely, while delivering a high-resolution visual and spatial dataset unmatched by any manual method.
Why Traditional Culvert Inspection Methods Often Fail
Inspections of legacy culvert systems, particularly those in ageing or partially collapsed condition, often suffer from:
Blockages from silt, debris, roots, or sediment
Structural instability and collapse risk
High water levels or unsafe access points
Unknown gas release upon sediment disturbance
Physical space too tight or angular for CCTV crawlers or ground personnel
Manned entry may be technically possible, but is almost always high-risk, involving confined space permits, rescue teams, atmospheric monitoring, and potentially fatal hazards that cannot be fully known or mitigated before entry.
Elios 3: The Safer, Smarter Alternative for Culvert Inspections
The Elios 3 confined space inspection drone is a purpose-built UAV that mitigates all risk to human life by providing remote access into dangerous environments. Its collision-tolerant cage, stabilised flight, and powerful data capture tools make it ideal for underground inspection tasks.
Key Features:
Onboard 4K camera for detailed visual condition surveys
LiDAR sensor to generate point cloud models of the culvert interior
360° LED lighting to illuminate pitch-black spaces
GPS-denied flight capability
First-person view (FPV) control with real-time operator feedback
This system allows us to fly deep into partially obstructed, collapsed, or heavily silted culverts where no human or robot could reach, gathering both visual and spatial data in a single, low-risk deployment.
Applications for Drone-Based Culvert Inspection
We support local authorities, drainage engineers, contractors, and utility providers in situations where:
Existing CCTV inspections have failed
Structural condition is completely unknown
There are piling operations planned nearby
Signs of subsidence or collapse have been observed
Ongoing construction poses risk to underground services
Entry is unsafe due to poor atmospheric conditions or partial collapse
By combining drone-based culvert inspection with topographical or utility survey data, we provide clients with a true position and condition overview enabling informed engineering decisions, risk assessments, and intervention strategies.
Project Outputs and Deliverables
A typical culvert drone survey using the Elios 3 includes:
High-definition video footage and still images of the internal culvert structure
Annotated defect and condition report
LiDAR-generated point cloud for 3D modelling and spatial analysis
Option to overlay survey outputs with line, level, and topographic data
Fully geo-referenced deliverables compatible with GIS, CAD, or BIM workflows
This combination of visual inspection and spatial referencing is ideal for planning remedial works, validating asset integrity, or proving conditions during construction and development phases.
Real-World Scenarios We Support
Culvert assessment ahead of nearby piling or groundworks
Monitoring of watercourse structures during infrastructure development
Verification of damage or deterioration due to subsidence
Inspections under highways, railways, or new-build housing estates
Asset handover or condition surveys following development projects
In most cases, we are called in after conventional methods have failed, or where risk assessments for manned entry flag unacceptable hazards.
Why Choose DJM Aerial Solutions?
With over a decade of experience in remote asset inspection and deep knowledge of confined space hazards, DJM Aerial Solutions is a trusted partner for infrastructure owners, engineers, and utility contractors.
Our Credentials:
Specialists in confined space inspection using Elios 3
Fully insured and CAA-authorised UAV operators
Confined space trained personnel with engineering experience
Integration of LiDAR data with external survey workflows
Rapid mobilisation and efficient on-site operation
Our drone-based methodology removes people from harm’s way while delivering actionable data with precision, clarity, and accuracy.
Ready to Survey Your Culvert Safely?
Whether you’re dealing with a blocked surface water culvert, a collapsed sewer line, or an inaccessible Victorian drainage system beneath a new housing development, we can help.
Contact DJM Aerial Solutions to discuss your culvert inspection requirements and learn how we can provide you with a complete, safe, and high-quality survey using our Elios 3 drone system.