North Brother Local Catchments Flood Study

Consultation has concluded

Wrights Creek

Background

Since early 2017, Port Macquarie-Hastings Council have been working with specialist consultants, Jacobs Group Australia to undertake the North Brother Local Catchments Flood Study.

The focus of the study is to understand the behavior of local catchment flash flooding from North Brother Mountain and the flood risk that it poses to the community. This will assist Council to develop measures to manage the impact of flooding and guide strategic planning for future development of the area. It includes areas of the villages of Laurieton, West Haven, Lakewood, Kew and Deauville.

The first stage of this ongoing project is now nearing completion, with the Draft North Brother Local Catchment Flood Study report being presented to Council at its Ordinary Meeting on 16 May 2019. At this time Council resolved to place the Flood Study on public exhibition for a period of 28 days from 20 May 2019 until 30 June 2019.

Community input and feedback is now sought into this key stormwater drainage project.

The Draft North Brother Local Catchments Flood Study

The North Brother Local Catchments Flood Study (2019) is a complex technical report that defines the present day flood characteristics for urban areas at the base of the North Brother Mountain.

The North Brother Local Catchments Study forms part of the NSW Floodplain Management Process and has bene undertaken within funding and support for the NSW office of Environment and Heritage (OEH). Our current stage is highlighted on the diagram below:



The Draft Report details the results of the first phase of this ongoing and key stormwater project, being the completion of the draft North Brother Local Catchment Flood Study.

Following completion of the Flood Study Phase, this project is funded to progress through 2 and 3 of the above process, being the creation and adoption of a Floodplain Risk Management Study and Plan.

The Draft Flood Study provides information on flood flows, depths, extents, levels and velocities for a range of different flood events and will ultimately be used by Council to define flood risk and identify and assess potential management options to mitigate these risks.

Why do we need a Flood Study?

  • Council is responsible for the management of flood liable land and has an obligation to implement the NSW Floodplain Management Program and Flood Policy.

  • Council needs to ensure that any new development is compatible with identified flood hazards and flood risks.

  • Council needs to ensure that existing flood risk is minimised, future flood risk is managed and that new development does not create additional flooding problems.

  • To aid in our development of management and mitigation measures to manage flood problems.

  • To enable Council to qualify for State Government subsidises for flood mitigation works to alleviate existing problems.


Summary of the results of the draft North Brother Local Catchment Flood Study

The draft North Brother Local Catchments Flood Study has resulted in the modelling of a range of design storm events including the 20% and 5%, 2%, 1% and 0.5% Average Exceedance Probability (AEP) flood events and the Probable Maximum Flood (PMF).

NOTE - The Average Exceedance Probability (or AEP) defines the likelihood of a flood/storm of a given size or larger occurring in any year; expressed as a percentage

In addition to the above, flood behaviour was estimated for a climate change scenario comprising the 1% AEP plus 10% increase in rainfall plus 0.9m sea level rise.

Flood mapping of depth and flow velocity was undertaken for all event AEPs.

Provisional Flood Mapping of Flood Risk and Hazard have also been completed.

The North Brother Local Catchments Flood Study Draft Report can be viewed in our document library (to the right or below if viewing this page on a mobile device).


Community Information Sessions

To assist in your understanding of the project, Council is also hosting two Community drop-in information sessions:

Where: Laurieton Library, located at Laurie Street, Laurieton

Dates: Wednesday 12 June 2019 & Saturday 15 June 2019

Time: 9:30 - 11:30am


Have Your Say

From Monday 20 May 2019 until Sunday 30 June 2019 the draft North Brother Local Catchments Flood Study will be available online to download, view and comment on. The documents may also be viewed in the foyer of the Port Macquarie Council administration building in Laurieton, Port Macquarie or Wauchope between 8:30am and 4:30pm Monday to Friday.

You are invited to comment or ask questions on the Study either online or sending us your written comments as follows:

  • Online vas the Submission tab below or to:

  • Email to: council@pmhc.nsw.gov.au, or

  • Post to: The General Manager, Port Macquarie-Hastings Council, PO Box 84, Port Macquarie NSW 2444.

Comments should be received no later than Sunday 30 June 2019.

Background

Since early 2017, Port Macquarie-Hastings Council have been working with specialist consultants, Jacobs Group Australia to undertake the North Brother Local Catchments Flood Study.

The focus of the study is to understand the behavior of local catchment flash flooding from North Brother Mountain and the flood risk that it poses to the community. This will assist Council to develop measures to manage the impact of flooding and guide strategic planning for future development of the area. It includes areas of the villages of Laurieton, West Haven, Lakewood, Kew and Deauville.

The first stage of this ongoing project is now nearing completion, with the Draft North Brother Local Catchment Flood Study report being presented to Council at its Ordinary Meeting on 16 May 2019. At this time Council resolved to place the Flood Study on public exhibition for a period of 28 days from 20 May 2019 until 30 June 2019.

Community input and feedback is now sought into this key stormwater drainage project.

The Draft North Brother Local Catchments Flood Study

The North Brother Local Catchments Flood Study (2019) is a complex technical report that defines the present day flood characteristics for urban areas at the base of the North Brother Mountain.

The North Brother Local Catchments Study forms part of the NSW Floodplain Management Process and has bene undertaken within funding and support for the NSW office of Environment and Heritage (OEH). Our current stage is highlighted on the diagram below:



The Draft Report details the results of the first phase of this ongoing and key stormwater project, being the completion of the draft North Brother Local Catchment Flood Study.

Following completion of the Flood Study Phase, this project is funded to progress through 2 and 3 of the above process, being the creation and adoption of a Floodplain Risk Management Study and Plan.

The Draft Flood Study provides information on flood flows, depths, extents, levels and velocities for a range of different flood events and will ultimately be used by Council to define flood risk and identify and assess potential management options to mitigate these risks.

Why do we need a Flood Study?

  • Council is responsible for the management of flood liable land and has an obligation to implement the NSW Floodplain Management Program and Flood Policy.

  • Council needs to ensure that any new development is compatible with identified flood hazards and flood risks.

  • Council needs to ensure that existing flood risk is minimised, future flood risk is managed and that new development does not create additional flooding problems.

  • To aid in our development of management and mitigation measures to manage flood problems.

  • To enable Council to qualify for State Government subsidises for flood mitigation works to alleviate existing problems.


Summary of the results of the draft North Brother Local Catchment Flood Study

The draft North Brother Local Catchments Flood Study has resulted in the modelling of a range of design storm events including the 20% and 5%, 2%, 1% and 0.5% Average Exceedance Probability (AEP) flood events and the Probable Maximum Flood (PMF).

NOTE - The Average Exceedance Probability (or AEP) defines the likelihood of a flood/storm of a given size or larger occurring in any year; expressed as a percentage

In addition to the above, flood behaviour was estimated for a climate change scenario comprising the 1% AEP plus 10% increase in rainfall plus 0.9m sea level rise.

Flood mapping of depth and flow velocity was undertaken for all event AEPs.

Provisional Flood Mapping of Flood Risk and Hazard have also been completed.

The North Brother Local Catchments Flood Study Draft Report can be viewed in our document library (to the right or below if viewing this page on a mobile device).


Community Information Sessions

To assist in your understanding of the project, Council is also hosting two Community drop-in information sessions:

Where: Laurieton Library, located at Laurie Street, Laurieton

Dates: Wednesday 12 June 2019 & Saturday 15 June 2019

Time: 9:30 - 11:30am


Have Your Say

From Monday 20 May 2019 until Sunday 30 June 2019 the draft North Brother Local Catchments Flood Study will be available online to download, view and comment on. The documents may also be viewed in the foyer of the Port Macquarie Council administration building in Laurieton, Port Macquarie or Wauchope between 8:30am and 4:30pm Monday to Friday.

You are invited to comment or ask questions on the Study either online or sending us your written comments as follows:

  • Online vas the Submission tab below or to:

  • Email to: council@pmhc.nsw.gov.au, or

  • Post to: The General Manager, Port Macquarie-Hastings Council, PO Box 84, Port Macquarie NSW 2444.

Comments should be received no later than Sunday 30 June 2019.

North Brother Local Catchments Flood Study Draft Report

Consultation has concluded