UAT: Child page of a section page
UAT: Child page of a section page
This page brings together Council reports, community presentations and technical studies, as well as other useful resources that can help you to learn more about debris flow hazards management and planning.
Several technical studies and works (led by ORC and technical consultants) have been completed to help better understanding the nature and characteristics of alluvial fans associated natural hazards including debris flows in Roxburgh area.
These studies reports do not give decisions but are useful information resources that help inform the councils, stakeholders and the community to undertake appropriate actions as well as to decide for next steps to manage the hazards effectively both now and in the future.
The studies and work have done spending from 2007 to present, which were undertaken by both ORC and our technical consultants.
Please also let us know:
Detailed debris flow hazard and risk assessment 2025:
Plain language of the Detailed debris flow hazard and risk assessment 2025
Geomorphological assessment:
Engineering options:
This document includes and discusses engineering options to help manage and mitigate risks from debris flows for the Roxburgh area.
Link to download: 2019- Golder - Roxburgh Creeks - Conceptual Engineering options.pdf
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Managing ongoing debris flow risk in Roxburgh:
The documents highlights the history of debris flows in the Roxburgh area as well as provides more information about how the events in November 2017 affected the Roxburgh community. Discussions on the options to manage and mitigate the risks from these hazards also included in the document.
Link to download: 2017 Roxburgh Debris Flows November 2017 Gns Report
These alluvial fans projects were implemented between 2007- 2009 to map all alluvial fans (larger than 0.5 km²) in the Otago region using GIS (Geographic Information System). Each fan was classified as active or inactive, and by its main depositional process: floodwater, debris or a mix of both.
These maps have been uploaded to the Otago Natural Hazards Portal. You can access them here https://experience.arcgis.com/experience/30bb9b65ada445b5af4ab4a0bc2d6d93/page/Alluvial-Fans.
The report focuses on 11 active fans with both high hazard potential and existing or planned development, detailing their characteristics and associated risks for communities including Roxburgh.
This report assesses the nature, extent and hazards of alluvial fans across the region including Roxburgh to inform community safety and land-use planning.
This report explains what alluvial fans are, exemplifies the different types of alluvial fan that occur in Otago, shows how alluvial fans can be identified. It also discusses the hazards posed to Otago communities from alluvial fans and outlines some of the ways that the risk can be mitigated.
Report to ORC Safety and Resilience Committee (November 2024)
Updates Council on progress with the Roxburgh debris flows hazard management programme.
Report: 2024 November- Council Paper- Roxburgh Natural Hazards Management.pdf
Report to ORC Technical Committee (September 2019)
Provides a brief update on debris flow activities in Roxburgh area.
Report to ORC Technical Committee (November 2017)
Summarises observations and preliminary assessments following the debris flow event and flooding and describes the alluvial fan hazards in the area.
Roxburgh Community Presentation (July 2024)
This presentation was to give an overview of natural hazards in Roxburgh including debris flows hazard as well as to provide updates on the programme progress and its debris flow investigations.
Presentation: Roxburgh Presentation (Jul 2024).pptx