This culvert inspection used an ROV to capture internal visual evidence from a difficult-to-access asset, helping the client assess condition and identify visible issues without a more intrusive conventional approach.
OVERVIEW
A client required a visual inspection of a culvert to assess internal condition and identify any visible issues that could affect performance, maintenance planning, or future remedial works. The asset presented significant access challenges due to its restricted internal environment, submerged sections, and the practical limitations of conventional inspection methods.
To complete the inspection safely and efficiently, an ROV was deployed to carry out a remote internal survey of the culvert. The system captured video and still imagery from within the structure, allowing the client to obtain clear visual evidence of internal conditions without relying on a more intrusive or personnel-intensive inspection approach.
THE CHALLENGE
The client needed to inspect the internal condition of a culvert in order to better understand its current state and determine whether any visible deterioration, obstruction, debris build-up, or structural concerns were present.
Culverts are often inherently difficult to inspect using conventional methods. Access points may be limited, internal dimensions can restrict movement, visibility may be poor, and the presence of water, silt, or debris can make inspection more complicated. In some cases, the culvert may also be located in an area where access for personnel or larger equipment is impractical.
For the client, the challenge was to obtain reliable inspection evidence from inside the asset without introducing unnecessary safety exposure, excessive disruption, or a more costly traditional inspection setup.
WHY CONVENTIONAL METHODS WERE LESS SUITABLE
A conventional approach to culvert inspection can present several practical and operational challenges.
Safety considerations
Culverts can create elevated safety risks where personnel access is required. Internal spaces may be confined, uneven, wet, unstable underfoot, or affected by limited visibility. In addition, depending on the culvert layout and surrounding environment, entry may require significant planning, supervision, and control measures before inspection can begin.
Access limitations
Physical access is often one of the main barriers to effective culvert inspection. Restricted entry points, narrow internal dimensions, submerged sections, and difficult terrain around the asset can all limit the practicality of conventional inspection techniques. Even where access is technically possible, the inspection may still be difficult to complete effectively using traditional methods.
Higher cost and disruption
Traditional inspection methods can also increase the cost and complexity of the work. Depending on the asset and site conditions, a conventional inspection may require additional personnel, traffic or site management controls, water management planning, or a more time-intensive inspection setup. This can make the inspection less efficient and more disruptive than the client would prefer.
For this project, the client required a lower-disruption method that could still provide clear and usable internal inspection evidence.
ROBOTIC INSPECTION APPROACH
To address these challenges, an ROV was used to carry out a remote internal inspection of the culvert.
The ROV was deployed into the asset to navigate the culvert interior and capture high-quality video and still imagery of the internal environment. This enabled the inspection to be completed without relying on direct personnel entry into the culvert and without the need for a more intrusive conventional inspection method.
Using the ROV, the inspection focused on:
- Assessing visible internal condition,
- Reviewing submerged and difficult-to-reach sections,
- Identifying obvious debris, obstruction, or surface deterioration,
- Capturing visual evidence for client review,
- Documenting observations to support reporting and next-step decision-making.
This approach allowed the client to inspect the culvert in a practical and controlled manner while reducing the access burden associated with more traditional methods.
INSPECTION SCOPE SUMMARY
- Remote internal visual inspection of the culvert
- Review of submerged and restricted-access sections
- Capture of inspection video and selected still imagery
- Observation of visible condition issues, debris, or obstruction
- Documentation of findings for client review
- Preparation of a structured inspection summary and reporting output
INTERNAL CONDITION EVIDENCE
A key part of the inspection was the ability to obtain clear visual evidence from within the culvert, particularly in areas that would have been more difficult to assess through conventional methods.
The ROV provided the client with imagery of internal culvert surfaces, joints, base conditions, and submerged zones where visible observations could be recorded. This gave the client a clearer understanding of asset condition and helped identify any areas requiring further attention.
SAFETY & OPERATIONS BENEFITS
One of the main advantages of the ROV-based approach was the ability to reduce reliance on more intrusive inspection methods while still obtaining useful and reviewable evidence from inside the asset.
By using robotic inspection, the client benefited from:
Reduced personnel exposure
The inspection reduced the need for personnel to enter a restricted internal culvert environment in order to gather condition data.
Improved access to difficult areas
The ROV could inspect submerged and difficult-to-reach sections of the culvert more effectively than would typically be possible using a conventional visual inspection approach.
Lower inspection disruption
The inspection could be completed with less site disruption and less operational complexity than a more traditional access-heavy inspection method.
Efficient capture of usable evidence
The client received clear footage, imagery, and reporting outputs to support asset understanding and maintenance planning.
Outcome
The inspection provided the client with a clear visual record of culvert conditions, including internal imagery and structured reporting to support review of the asset. This allowed the client to better understand the culvert environment, identify visible issues, and make more informed decisions regarding maintenance, cleaning, monitoring, or any further investigation that may be required.
By using an ROV, the client was able to inspect a difficult-to-access culvert in a way that reduced personnel exposure, lowered access complexity, and avoided the additional disruption often associated with conventional inspection methods.
Key Benefits Delivered
- Remote inspection of a difficult-to-access culvert
- Reduced need for personnel entry into a restricted internal environment
- Improved access to submerged and limited-visibility sections
- Lower-disruption alternative to conventional inspection methods
- High-quality video and still imagery for review
- Clear reporting to support maintenance and asset management decisions