Samenvatting

1. Topics of interest were defined following a risk based approach.
2. Study priorities were set based on knowledge gaps in current practices, but they were conditioned by pragmatic limitations.
3. Focus topics : failure modes, detection and monitoring and repairs.
4. Serious failures can occur in sections with large burrows (e.g. fox and beaver holes), but also in sections with mole burrows. Research in progress.
5. Detection and monitoring techniques were developed and tested in the living lab, but results are site specific. Further testing is needed for benchmarking.
6. A low cost repair technique was developed and evaluated.