A simple end-of-pipe visual inspection of culverts may not provide enough detail to manage culverts efficiently. To help users obtain additional detailed data, many inspection technologies have been developed. Which technology is right for the job? A new manual from MnDOT provides guidance.
The Enhanced Culvert Inspections Best Practices Guidebook is a primer on common culvert inspection technologies and applications. The manual summarizes the advantages and limitations of each technology and provides best practices when planning for and implementing an enhanced inspection project.
Enhanced inspection technologies can measure or digitally record conditions that would not be apparent from a simple visual inspection. Common enhanced inspection technologies include:
- Multiple sensor inspection (e.g., laser ring, sonar, inclinometer)
- Mandrel inspection
- Hammer sound testing
- Core sampling test
- Closed-circuit television (CCTV) camera inspection
- Hydraulic Inspection Vehicle Explorer (HIVE) Inspection
- Joint Photographic Experts Group (JPEG) Mosaic Inspection
The best practices in the document were developed based on a combination of industry standards and MnDOT practice. In addition, practical and logistic considerations are identified to assist staff in selecting cost-effective inspection methods for typical types of inspection.
- Enhanced Culvert Inspections Best Practices Guidebook (June 2017, 6.9 MB PDF)
- Technical Summary
- Project Page
- Enhanced Culvert Inspections Webinar
- Minnesota LTAP online training: Culvert Installation and Maintenance for Local Agencies