ICOLL Flash Flood Warning System Scoping Study

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Council received grant funding from the Australian Government, through the (then) National Recovery and Resilience Agency’s Preparing Australian Communities Program – Local Stream, to undertake a scoping study for the implementation of a Total Flood Warning System (TFWS) covering three catchments within the Shoalhaven LGA. The three catchment areas are Burrill Lake, Lake Conjola and Tabourie Lake. These catchments are characterised by being exposed to flash flooding and comprising Intermittently Closed and Open Lakes and Lagoons (ICOLLs) with existing low-lying historic development adjacent to these coastal lakes.

Measures to improve flood warning and response through the implementation of a TFWS were recommended in the individual catchments' Floodplain Risk Management Study and Plans (FRMS&P) to reduce flood impacts and the risk to life within these catchments. This project will be undertaken in accordance with the NSW Flood Prone Land Policy, the NSW Flood Risk Management Manual (2023) and in close collaboration with the NSW State Emergency Service (SES), the NSW Department of Climate Change, Energy, the Environment and Water (DCCEEW), and other agencies and stakeholders.

Council has engaged a contractor, Manly Hydraulics Laboratory (MHL), to assist with the preparation of the ICOLL Catchments Flash Flood Warning System Scoping Study.

Project Objectives

The primary objectives of this study are to scope the requirements and determine feasible options for the implementation of a fit-for-purpose location-based flash flood warning system for the three catchments to predict lake levels in a flood event, provide early warning, and assist with flood response and pre-flood entrance management procedures. The scoping study will also provide advice on the system design for an optimal TFWS based on the scoping work, which includes operational protocols and preliminary costing for both the capital and ongoing maintenance costs of the systems for Council consideration.

Consultation

Community consultation is an important role for the successful implementation of a TFWS. Comprehensive community consultation will be undertaken throughout the project.

Council received grant funding from the Australian Government, through the (then) National Recovery and Resilience Agency’s Preparing Australian Communities Program – Local Stream, to undertake a scoping study for the implementation of a Total Flood Warning System (TFWS) covering three catchments within the Shoalhaven LGA. The three catchment areas are Burrill Lake, Lake Conjola and Tabourie Lake. These catchments are characterised by being exposed to flash flooding and comprising Intermittently Closed and Open Lakes and Lagoons (ICOLLs) with existing low-lying historic development adjacent to these coastal lakes.

Measures to improve flood warning and response through the implementation of a TFWS were recommended in the individual catchments' Floodplain Risk Management Study and Plans (FRMS&P) to reduce flood impacts and the risk to life within these catchments. This project will be undertaken in accordance with the NSW Flood Prone Land Policy, the NSW Flood Risk Management Manual (2023) and in close collaboration with the NSW State Emergency Service (SES), the NSW Department of Climate Change, Energy, the Environment and Water (DCCEEW), and other agencies and stakeholders.

Council has engaged a contractor, Manly Hydraulics Laboratory (MHL), to assist with the preparation of the ICOLL Catchments Flash Flood Warning System Scoping Study.

Project Objectives

The primary objectives of this study are to scope the requirements and determine feasible options for the implementation of a fit-for-purpose location-based flash flood warning system for the three catchments to predict lake levels in a flood event, provide early warning, and assist with flood response and pre-flood entrance management procedures. The scoping study will also provide advice on the system design for an optimal TFWS based on the scoping work, which includes operational protocols and preliminary costing for both the capital and ongoing maintenance costs of the systems for Council consideration.

Consultation

Community consultation is an important role for the successful implementation of a TFWS. Comprehensive community consultation will be undertaken throughout the project.

  • Final Flood Warning Options Report

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    The Options Report for the Shoalhaven ICOLL Catchments Flash Flood Warning System Scoping Study has been finalised based on community and agency feedback received in late 2023.

    The majority of community and agency feedback received supported the development of a Flood Warning System with preference to Option 3 (Predictive flood warning and decision support with priority 2 gauge installation works) for each catchment.

    Please refer to the report and summary tables in the Document Library for details of what each Flood Warning Option includes.

    This project has now progressed to the detailed development of the preferred Flood Warning System for each catchment and is expected to be completed by the end of 2024.

    Council is seeking funding opportunities to progress with the implementation of each Flood Warning System following the detailed development of the preferred Flood Warning System option for each catchment.

  • Have your say – Draft Flood Warning Options Report Public Exhibition Extended

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    Public exhibition of the Draft Options Report for the Shoalhaven ICOLL Catchments Flash Flood Warning System Scoping Study is currently underway.

    Drop-in sessions were held in Burrill Lake and Lake Conjola on Tuesday 14 November and Wednesday 15 November 2023. Council would like to thank all community members that have currently completed an online survey or attended a community drop-in session for this project.

    Following community feedback, Council has decided to extend the public exhibition period until Sunday 3 December 2023 and make it easier for the community to complete the survey for this project. Please provide your feedback by completing the Online Survey or completing a hard copy survey at the following locations:

    • Lake Conjola
      • Post office
      • Bowling Club
      • Mar & Dars Café
    • Burrill Lake
      • Post Office
      • Ice Box Liquor
    • Lake Tabourie
      • Tucker Box


    This survey seeks your input on the different flood warning system options which have been considered before the project progresses with more detailed investigations for the preferred flood warning system in each catchment.

  • Have Your Say - Draft Flood Warning Options Report

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    Council has engaged a contractor, Manly Hydraulics Laboratory, to undertake the Shoalhaven ICOLL Catchments Flash Flood Warning System Scoping Study for the catchments of Lake Conjola, Burrill Lake, and Tabourie Lake.

    The public exhibition of the Draft Options Report seeks your input on the different flood warning system options considered before the project progresses with more detailed investigations for the preferred flood warning system in each catchment.

    A brief survey is also available to capture your feedback on the various flood warning options considered to help us complete the scoping study.

    Please provide your feedback by completing the Online Survey on this webpage by Sunday 26 November 2023.

    Summary videos explaining the study and potential flood warning system options for Lake Conjola, Burrill Lake and Tabourie Lake, as well as catchment maps and options summary tables, are included in the document library. Updated FAQs are available on this Get Involved webpage.

    You can also complete the survey, in person, at the drop-in session on Tuesday 14 November 2023 between 3:00pm – 6:30pm at the Burrill Lake Community Hall OR Wednesday 15 November 2023 between 3:00pm – 6:30pm at the Lake Conjola Community Centre. Council staff, DPE Flood Risk Specialist, local SES volunteers and our consultants working on this project will be available to discuss the project and draft report.

  • Flood Warning System Options

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    Thank you for your input. This survey has now closed.

    We value your feedback!

    We would greatly value any feedback from our community as we start investigating flash flood warning system options for Burrill Lake, Lake Conjola and Tabourie Lake.

    Please complete the short online survey below. It will only take about 10 minutes of your time.

    All information provided will be confidential and used only for the purpose of the study.

    Please complete the Online Survey by 5 pm, Sunday 18 June 2023.

    We look forward to working with you over the course of this project.

Page last updated: 12 Aug 2024, 09:34 AM