Investigations and reports

Me nanao atu te rika Get involved

This page brings together technical studies, Council reports, community presentations as well as other useful resources that can help you to learn more about debris flows or debris flood hazards management and planning.

Note: 'debris flow' is a generic term for this hazard, the latest (2026) risk assessment specifically looks at the likelihood of debris flood in the Roxburgh area.

Several technical studies and works (led by ORC and technical consultants) have been completed to help better understand the nature and characteristics of alluvial fans associated natural hazards including debris flood in Roxburgh area.

These reports are useful resources that help inform councils, stakeholders and the community.

Please also let us know:

If you think the reports have missed anything?
Do you have any questions, or is any information unclear?
Do you agree with the expert assessments – if not, why not?
Which of the approaches discussed in the report do you think should be investigated further – and why?

Debris flood reports, hazard and risk maps

A new study has been completed for 13 catchments in the Teviot Valley looking at debris flood hazard and risks. The new mapping identifies areas more likely to be affected by debris floods and the possible effects on people, places and key infrastructure.

On this page, you can view the study report and summary, a map of the new study area, and the hazard and risk maps for the 13 catchments in the Teviot Valley.