Dee Why South Catchment Flood Study

This consultation has concluded."

Warringah Council is undertaking a detailed Flood Study of the Dee Why South Catchment, which includes parts of Narraweena and Dee Why CBD. The study will build on previous flood investigations in the area to develop a formalised flood study of the whole catchment in accordance with the NSW Government Floodplain Development Manual (2005). 

The aims of the study are to:

  •        define existing flood behaviour
  •        help identify flooding problem areas in the catchment

The study will help improve council’s planning and management of the catchment, such as setting flood levels for development and improving flood emergency responses.

For further information please read the study background, how to be involved  and the FAQ section.

The Flood Study is receiving financial and technical support from the NSW Office of Environment and Heritage.

Warringah Council is undertaking a detailed Flood Study of the Dee Why South Catchment, which includes parts of Narraweena and Dee Why CBD. The study will build on previous flood investigations in the area to develop a formalised flood study of the whole catchment in accordance with the NSW Government Floodplain Development Manual (2005). 

The aims of the study are to:

  •        define existing flood behaviour
  •        help identify flooding problem areas in the catchment

The study will help improve council’s planning and management of the catchment, such as setting flood levels for development and improving flood emergency responses.

For further information please read the study background, how to be involved  and the FAQ section.

The Flood Study is receiving financial and technical support from the NSW Office of Environment and Heritage.

This consultation has concluded."
  • Final Flood study adopted

    almost 4 years ago

    Warringah Council adopted the Dee Why South Catchment Flood Study on the 27 August 2013.  The Flood Study will soon be available from the Council's website and Section 149 (2) planning certificates will be amended for properties affected.

    During the exhibition letters were sent to all affected residents, advertisements appeared in the Manly Daily and public information sessions were held at the Civic Centre in Dee Why.  This project page received 2201 site visits and 391 documents. Three submissions were received, reported to the Dee Why South Catchment Flood Study Working Group on 30 July 2013 and incorporated into the final report. 

    Warringah Council adopted the Dee Why South Catchment Flood Study on the 27 August 2013.  The Flood Study will soon be available from the Council's website and Section 149 (2) planning certificates will be amended for properties affected.

    During the exhibition letters were sent to all affected residents, advertisements appeared in the Manly Daily and public information sessions were held at the Civic Centre in Dee Why.  This project page received 2201 site visits and 391 documents. Three submissions were received, reported to the Dee Why South Catchment Flood Study Working Group on 30 July 2013 and incorporated into the final report. 

  • Draft Flood Study Report Released

    by site admin 1, about 4 years ago

    Council is seeking comments on the Draft Dee Why South Catchment Flood Study Report. The main aim of the study is to understand current and future flood behaviour in the Dee Why South Catchment.

    View the Draft Flood Study report (note the report is in two parts):

    Or you can view the documents at the Civic Centre, Dee Why or at one of our libraries (Dee Why, Warringah Mall, Belrose or Forestville).

    How to make a submission

    Post: The General Manager
    Marked: 'Submission – Draft Dee Why South Catchment Flood Study'
    Warringah Council,
    725 Pittwater Rd,
    Dee Why 2099
    email: council@warringah.nsw.gov.au

    Submissions close Wednesday 19 June 2013.

    Following the public exhibition, all comments will be reviewed and final amendments to the study made. The report will then be presented to Council for adoption and used in the preparation of the Dee Why South Catchment Floodplain Risk Management Plan. The plan will contain management measures to guide and coordinate the responsibilities of government and the community in undertaking flood management works and initiatives.

    Council is seeking comments on the Draft Dee Why South Catchment Flood Study Report. The main aim of the study is to understand current and future flood behaviour in the Dee Why South Catchment.

    View the Draft Flood Study report (note the report is in two parts):

    Or you can view the documents at the Civic Centre, Dee Why or at one of our libraries (Dee Why, Warringah Mall, Belrose or Forestville).

    How to make a submission

    Post: The General Manager
    Marked: 'Submission – Draft Dee Why South Catchment Flood Study'
    Warringah Council,
    725 Pittwater Rd,
    Dee Why 2099
    email: council@warringah.nsw.gov.au

    Submissions close Wednesday 19 June 2013.

    Following the public exhibition, all comments will be reviewed and final amendments to the study made. The report will then be presented to Council for adoption and used in the preparation of the Dee Why South Catchment Floodplain Risk Management Plan. The plan will contain management measures to guide and coordinate the responsibilities of government and the community in undertaking flood management works and initiatives.

  • Community Information Sessions

    by site admin 1, about 4 years ago

    Council is able to provide information about specific properties in the catchment area within the draft report. If you would like more information about your property please contact Duncan Howley on 02 9942 2381 or email duncan.howley@warringah.nsw.gov.au.

    You are also invited to attend one of the community information sessions at the Civic Centre, Dee Why on either:

    • Thursday 6 June: 6 – 8 pm
    • Thursday 13 June: 6 – 8 pm
    • Saturday 15 June: 10am - 12pm

    RSVP required: call 9942 2381 or email duncan.howley@warringah.nsw.gov.au.

    Council is able to provide information about specific properties in the catchment area within the draft report. If you would like more information about your property please contact Duncan Howley on 02 9942 2381 or email duncan.howley@warringah.nsw.gov.au.

    You are also invited to attend one of the community information sessions at the Civic Centre, Dee Why on either:

    • Thursday 6 June: 6 – 8 pm
    • Thursday 13 June: 6 – 8 pm
    • Saturday 15 June: 10am - 12pm

    RSVP required: call 9942 2381 or email duncan.howley@warringah.nsw.gov.au.

  • Flood Study Update

    by site admin 1, over 4 years ago

    In accordance with NSW Government guidelines, a Working Group has been formed to help oversee the preparation of the Dee Why South Catchment Flood Study.  The first meeting of the Working Group was held on 11 February 2013 and members included Warringah Councillors, community representatives, State Government representatives and Council staff. 

    Stage 3 of the study has now commenced and is on schedule to conclude with the Flood Study Report being submitted in mid 2013.

    Reports for Stage One and Stage Two are available below:

    Stage 1 report is a summary of the findings from the community engagement activities undertaken.  It found that a third of all survey respondents had experienced flooding with most having inundation in the front or back yard and below floor level.  It also showed that there are particular flooding ‘hotspots’ within the catchment including Howard Avenue, Oaks Avenue, Delmar Parade, Pittwater Road and Beverley Job Park.  

    Stage 2 report is a peer review of the computer flood model.  Council’s consultant found that while the model was reasonably accurate, a number of refinements could be made to further improve its accuracy. These refinements are currently being made.

    In accordance with NSW Government guidelines, a Working Group has been formed to help oversee the preparation of the Dee Why South Catchment Flood Study.  The first meeting of the Working Group was held on 11 February 2013 and members included Warringah Councillors, community representatives, State Government representatives and Council staff. 

    Stage 3 of the study has now commenced and is on schedule to conclude with the Flood Study Report being submitted in mid 2013.

    Reports for Stage One and Stage Two are available below:

    Stage 1 report is a summary of the findings from the community engagement activities undertaken.  It found that a third of all survey respondents had experienced flooding with most having inundation in the front or back yard and below floor level.  It also showed that there are particular flooding ‘hotspots’ within the catchment including Howard Avenue, Oaks Avenue, Delmar Parade, Pittwater Road and Beverley Job Park.  

    Stage 2 report is a peer review of the computer flood model.  Council’s consultant found that while the model was reasonably accurate, a number of refinements could be made to further improve its accuracy. These refinements are currently being made.

  • How to be involved?

    by Project Team 4, almost 5 years ago

    Community input is an important part of the flood study. The aim is to inform and consult with the community about the development of the flood study and its outcomes. It also provides an opportunity for the community to provide details of their flood experience, their concerns regarding flooding issues and to provide feedback and ideas on potential floodplain management activities.

    There are a number of ways you can be involved in the study at this early stage:

    • Complete the community flood survey that will be distributed to local residents asking for information on  historical flood events within the catchment area.
    • Go online and complete the community flood survey
    • Provide comments on the online forum.
    • Review the webpages to keep informed of the project.

    Later Public Exhibition

    A public exhibition of the Draft Flood Study will be held later in the year (location and time to be confirmed). This will include:

    • Formal submissions on the flood study
    • A community information session - to hear about the existing and future flood risk posed to the community, and to give your ideas and concerns in regard to ongoing management of flooding in the catchment.

    Community input is an important part of the flood study. The aim is to inform and consult with the community about the development of the flood study and its outcomes. It also provides an opportunity for the community to provide details of their flood experience, their concerns regarding flooding issues and to provide feedback and ideas on potential floodplain management activities.

    There are a number of ways you can be involved in the study at this early stage:

    • Complete the community flood survey that will be distributed to local residents asking for information on  historical flood events within the catchment area.
    • Go online and complete the community flood survey
    • Provide comments on the online forum.
    • Review the webpages to keep informed of the project.

    Later Public Exhibition

    A public exhibition of the Draft Flood Study will be held later in the year (location and time to be confirmed). This will include:

    • Formal submissions on the flood study
    • A community information session - to hear about the existing and future flood risk posed to the community, and to give your ideas and concerns in regard to ongoing management of flooding in the catchment.
  • The Dee Why South Catchment Flood Study Working Group

    by Project Team 4, almost 5 years ago

    A working group has been formed consisting of self-nominated representatives from the local community and businesses.

    This working group was established in late 2012 for the new Dee Why South Catchment Flood Study. The aim of the group is to provide stakeholder input and help guide Council in the development and implementation of a floodplain risk management plan for the Dee Why South catchment.

    A working group has been formed consisting of self-nominated representatives from the local community and businesses.

    This working group was established in late 2012 for the new Dee Why South Catchment Flood Study. The aim of the group is to provide stakeholder input and help guide Council in the development and implementation of a floodplain risk management plan for the Dee Why South catchment.

  • Community Input - Historical Flooding Feedback

    by Project Team 4, almost 5 years ago

    Please complete the Online Survey or add your comments to the Online Forum.

    Any additional flooding information and/or photographs can be emailed directly to: Warringah Council. Community input closes 26 October 2012.

    Please complete the Online Survey or add your comments to the Online Forum.

    Any additional flooding information and/or photographs can be emailed directly to: Warringah Council. Community input closes 26 October 2012.

  • Dee Why South Catchment

    by Project Team 4, almost 5 years ago

    The Dee Why South catchment includes parts of the suburbs of Dee Why and Narraweena, with the Dee Why CBD located in its lower reaches.  The catchment area is approximately 268ha, the majority of which is residential development.

    The catchment is bordered by McIntosh Road to the north, Waratah Parade to the west, May Road to the south and discharges to Dee Why Lagoon. The study area is a sub-catchment of the greater Dee Why Lagoon catchment.

    Flooding in the Dee Why South Catchment comes primarily from surface waters in the catchment.  The highly urbanised catchment creates a higher frequency of flooding and a very 'flashy' nature, meaning rainfall is quickly transferred to the drainage system and then downstream to catchment outflows.

    The Dee Why South catchment includes parts of the suburbs of Dee Why and Narraweena, with the Dee Why CBD located in its lower reaches.  The catchment area is approximately 268ha, the majority of which is residential development.

    The catchment is bordered by McIntosh Road to the north, Waratah Parade to the west, May Road to the south and discharges to Dee Why Lagoon. The study area is a sub-catchment of the greater Dee Why Lagoon catchment.

    Flooding in the Dee Why South Catchment comes primarily from surface waters in the catchment.  The highly urbanised catchment creates a higher frequency of flooding and a very 'flashy' nature, meaning rainfall is quickly transferred to the drainage system and then downstream to catchment outflows.

  • About the Study

    by Project Team 4, almost 5 years ago

    A number of different investigations into flooding in this area have been undertaken since 1975.  However, a formal flood study for the whole catchment in line with NSW State Government's Flood Policy has never been undertaken.

    This study will aim to evaluate flooding for the whole Dee Why South Catchment and begin the formal floodplain management process as stated in the NSW Floodplain Development Manual (2005).

    Warringah Council will administer the project and has engaged Cardno, an independent company specialising in flooding and floodplain risk management, to undertake the study.

    A number of different investigations into flooding in this area have been undertaken since 1975.  However, a formal flood study for the whole catchment in line with NSW State Government's Flood Policy has never been undertaken.

    This study will aim to evaluate flooding for the whole Dee Why South Catchment and begin the formal floodplain management process as stated in the NSW Floodplain Development Manual (2005).

    Warringah Council will administer the project and has engaged Cardno, an independent company specialising in flooding and floodplain risk management, to undertake the study.

  • Background

    by Project Team 4, almost 5 years ago

    The Dee Why South Catchment Flood Study forms part of a larger Council 10 year flood program.  The program aims to identify all flood prone land within Warringah LGA by 2018.  A list of the flood studies currently adopted by Council can be on Council's website.

    The flood study is the first stage of the Floodplain Risk Management Process, and establishes a basis for a future floodplain risk management study and plan, which will highlight and develop management options to mitigate the flood risk to life and property.  The floodplain management process is described in the FAQs.

    For further information contact Flood Study Project Team on 9942 2111 or email howled@warringah.nsw.gov.au.

    The Dee Why South Catchment Flood Study forms part of a larger Council 10 year flood program.  The program aims to identify all flood prone land within Warringah LGA by 2018.  A list of the flood studies currently adopted by Council can be on Council's website.

    The flood study is the first stage of the Floodplain Risk Management Process, and establishes a basis for a future floodplain risk management study and plan, which will highlight and develop management options to mitigate the flood risk to life and property.  The floodplain management process is described in the FAQs.

    For further information contact Flood Study Project Team on 9942 2111 or email howled@warringah.nsw.gov.au.