Flooding

flood risk management

Steep terrain and ridge-top development have led to the major flood risk within Ku-ring-gai resulting from flash flooding along headwater streams and drainage depressions. Ku-ring-gai’s flood risk management program is based on the requirements of the NSW Floodplain Development Manual and Flood Prone Land Policy.

The primary objective is to allow the appropriate use of flood prone land while reducing the impact of flooding and flood liability on individual owners and occupiers of flood prone property and to reduce the private and public losses resulting from floods.

We welcome your contribution to the below flood study consultation and Flood Risk Management Committee.

Middle Harbour Southern Catchments Flood Study - Have Your Say

We welcome your feedback on the draft Draft Middle Harbour - Southern Catchments Flood Study, recently completed by consultants BMT. It will be on public exhibition until 5pm 24 May 2022. For more information and links to documents, please go to Council’s Your Say page.    

Flood Risk Management Committee - Join us

We are currently looking for six community representatives to join the Council Flood Risk Management Committee

Apply now

This advisory group is the first formal step in the floodplain risk management process.

The management committee acts as both a focus and forum for the discussion of technical, social, environmental, cultural and economic issues and for the distillation of possibly differing viewpoints on these issues during the development of the flood studies and flood risk management plans. Consequently, its membership is diverse and consists of representatives from Council (elected representatives and staff), relevant government agencies including Office of Environment and Heritage, National Parks and Wildlife Service NSW, Sydney Water and the State Emergency Service, as well as representatives from the local community.

Council’s Floodplain Risk Management Committee (established in 2015) is currently overseeing implementation of the floodplain risk management process for sub-catchments in the LGA, in partnership with the NSW Office of Environment and Heritage.

There are currently 5 community representatives on Ku-ring-gai’s Flood Risk Management Committee in addition to Chair Deputy Mayor Barbara Ward Deputy Chair Councillor Greg Taylor.  

Meetings of the Committee are held as required. Meeting agendas and minutes are published on Council's website.

Please read the Terms of Reference(PDF, 229KB)  and apply now if interested.

 

 

Current studies

Lane Cove Northern Catchments Flood Study

Ku-ring-gai Council has recently received funding for the Lane Cove Northern Catchments flood Study through the NSW Government Floodplain Management Program grants 2020-21.

The study area includes Coups Creek, Water Dragon Creek, Peppermint Creek, Avondale Creek and Quarry Creek as well as smaller tributaries of Lane Cove River.

These waterways are in the suburbs of Wahroonga, Warrawee, Turramurra, South Turramurra, Pymble and West Pymble.

For more information about this study please read the community newsletter(PDF, 2MB).

Middle Harbour Northern Catchments Flood Study

Council has received funding for the Middle Harbour Northern Catchments flood study through the NSW Government Floodplain Management Program grants 2019-20. The catchment area includes Middle Harbour Creek (and associated tributaries) in St Ives and Rocky Creek (including Stoney Creek and High Ridge Creek) in Gordon/East Killara which flow into Middle Harbour. This flood study commenced in 2020 with the draft report expected in 2022.

For more information about this study please read the community newsletter(PDF, 2MB).

Middle Harbour Southern Catchments Flood Study

Council has received funding for the Middle Harbour southern catchments flood study through the NSW Government Floodplain Management Program grants 2018–19. The Middle Harbour Southern Catchments Flood Study area consists of five catchments. These include Echo Point and Moores Creek in Roseville, “Wellington Road” and Gordon Creek in Lindfield and “Northern and Southern Creeks” in Killara, all flowing into Middle Harbour.

For more information about this study please read the community newsletter(PDF, 220KB).

 

Completed studies, reports and mapping

Blackbutt Flood Risk Management Study and Plan

Blackbutt Creek Flood Risk Management Study and Plan was completed in August 2016.

This report builds on the findings from the Blackbutt Creek Flood Study (2014) and outlines measures to mitigate flooding including land use planning, community awareness, flood warning and infrastructure changes and upgrades.

Blackbutt Creek Flood Risk Management Study Report(PDF, 445KB)

Preliminary Floodplain Management Measures(PDF, 3MB)

Floodplain Risk Management Plan and References(PDF, 50KB)

Appendix A Locality Plan, Pipe Network and Vulnerable Locations

Appendix A Locality Plan(PDF, 2MB)

Appendix A Pipe Network Capacity(PDF, 4MB)

Appendix A Vulnerable Locations(PDF, 2MB)

Appendix A Emergency Response Classification Maps

Appendix A AEP Emergency Response Classification Maps(PDF, 7MB)

Appendix A PMF Emergency Response Classification(PDF, 4MB)

Appendix A Flood Risk Precinct 20% & 5% AEP

Appendix A Flood Risk Precinct Maps 20% AEP Proposed True Hazard Classification(PDF, 5MB)

Appendix A Flood Risk Precinct Maps 5% AEP Proposed True Hazard Classification(PDF, 5MB)

Appendix A Flood Risk Precinct 1% and AEP

Appendix A Flood Risk Precinct Map 1% AEP Proposed True Hazard Classification(PDF, 5MB)

Appendix A Flood Risk Precinct Map PMF Proposed True Hazard Classification(PDF, 5MB)

Appendix A Flood Modification Options

Appendix A Flood Modification Mitigation Options(PDF, 5MB)

Appendix B Assessment of Changes in the Blackbutt Creek Catchment

Appendix B Assessment of Changes in the Blackbutt Creek Catchment(PDF, 3MB)

Appendix C Draft Flood Planning Matrix – Appendix D Sensitivity Memorandum

Appendix C Draft Flood Planning Matrix(PDF, 39KB)

Appendix D Sensitivity Memorandum(PDF, 189KB)

Appendix D Sensitivity Memorandum Map(PDF, 5MB)

Blackbutt Creek Flood Study

The Blackbutt Creek Flood Study is the first of a series of detailed flood studies to be undertaken in Ku-ring-gai. This study used historical information, landscape survey, stormwater pipe data and computer modelling techniques to indicate areas likely to be impacted by flooding. The original Flood Study was completed in December 2014.

Final Report Blackbutt Creek Flood Study, Appendix A- B Community Consultation Survey and Summary

Final Report Blackbutt Creek Flood Study – Appendix A – B Community Consultation Survey and Summary(PDF, 4MB)

Appendix C- Flood Depth Mapping

Appendix C – Flood Depth Mapping(PDF, 10MB)

Appendix D- Flood Level Mapping, Appendix E- Summary of Peak Flows, Appendix F- Hydraulic Categories Mapping

Appendix D Flood Level Mapping – Appendix E Summary of Peak Flows – Appendix F Hydraulic Categories Mapping(PDF, 9MB)

Appendix G- Provisional Flood Hazard Mapping

Appendix G Provisional Flood Hazard Mapping(PDF, 6MB)

Appendix H - Flood Planning Area Mapping, Appendix I- Preliminary Flood Emergency Response Classification of Communities, Appendix J- Climate Change Impact Mapping

Appendix H Flood Planning Area Mapping – Appendix I Preliminary Flood Emergency Response Classification of Communities – Appendix J Climate Change Impact Mapping(PDF, 5MB)

Lovers Jump Creek Flood Study Review Report

The Lovers Jump Creek Flood Study Review Report (2018) was adopted by Council in November 2018.

Lovers Jump Creek Flood Study Review Report 2018

Lovers Jump Creek Flood Study, November 2018

Final Report(PDF, 2MB)

Appendix A- Historic Rainfall Data, Appendix B- Community Consultation, Appendix C- Questionnaire Responses and Verification of Model Flood Behaviour, Appendix D- Flood Depth Mapping

Appendix A - D(PDF, 5MB)

Appendix E- Flood Level Mapping, Appendix F- Summary of Peak Flows

 Appendix E - F(PDF, 3MB)

Appendix G- Hydraulic Categories Mapping, Appendix H- Provisional Flood Hazard Mapping, Appendix I- Flood Planning Area Mapping, Appendix J- Preliminary Flood Emergency Response Classification of Communities

Appendix G - J(PDF, 6MB)

Appendix K- Climate Change Impact Mapping, Appendix L- Impacts of ARR 2016 and At-Site Design Rainfall on Flood Behaviour

Appendix K - L(PDF, 3MB)

Lovers Jump Creek Flood Risk Management Study and Plan

More information

Email floodriskmanagement@krg.nsw.gov.au or call Sophia Findlay, Water and Catchments Program Leader on 9424 0853.