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Tabourie Lake Floodplain Risk Management Study and Plan

Shoalhaven City Council has engaged Cardno to assist with the preparation of the Tabourie Lake Floodplain Risk Management Study and Plan.

The Risk Management Study and Plan follows from the Flood Study, completed in 2010, which identified the existing flooding behaviour in the Tabourie Lake catchment.  The purpose of this Risk Management Study and Plan is to identify and recommend appropriate actions to manage flood risks in the Tabourie Lake catchment.

This information provides an introduction to the Risk Management Study and Plan and informs you of its objectives.

Your feedback on the accompanying questionnaire will play an important role in the project.  

Community Workshop Presentation

On the evening of Monday 7 July 2014, Council held a community workshop at Lake Tabourie Rural Fire Shed to discuss the progress of the study and to receive feedback from the community regarding the proposed options.  The workshop was well received by those who attended..

Consultants Cardno provided a 30 minute presentation which was followed by questions and discussion with Council staff and the Consultants from those in attendance.  A copy of the presentation slides and a link to an audio copy of the presentation are provided below.

Final Presentation - Tabourie Lake Community Workshop 2    

Audio Presentation

Existing Flooding Issues

As identified in the Flood Study (WBM, 2010) the study area is subject to flooding from both catchment rainfall and lake/ocean surges.

The lake outlet condition plays a large role in catchment flood behaviour.  Inital lake levels however, do not significantly affect flood behaviour.

The probable maximum flood extent (extreme flood) for the Tabourie Lake catchment is shown below.


Study Area

The study area comprises the Tabourie Lake catchment, incorporating the Tabourie Lake Township and surrounding areas. The Tabourie Lake catchment area covers approximately 48 square kilometres (see below).  The Tabourie Lake Broadwater is fed primarily by Lucy Kings Creek and Munno Creek.  Other tributaries include Branderee Creek, Tabourie Creek and Lemon Tree Creek.  The Lake has an outlet, adjacent to the Tabourie Lake Township to the Tasman Sea.

Floodplain Management Process

Council's Shoalhaven River Natural Resource and Floodplain Risk Management Committee (the Committee) oversees the Floodplain Management process.  The Committee meets regularly and includes representatives from Council, Office of Environment and Heritage (OEH), State Emergency Service (SES), NSW Department of Primary Industries (DPI) and representatives of the local community.

Floodplain Risk Management Study and Plan Objectives

The objectives of the study and plan are:

Floodplain Risk Management Study
Find an appropriate mix of management measures and strategies to effectively manage the full range of flood risk in accordance with the NSW Government Floodplain Development Manual (2005) through an effective public participation and community consultation program.  The information from this study will enable Council to formulate a Floodplain Risk Management Plan for the study area.

Floodplain Risk Management Plan
Formulate a cost effective plan for the study area based on the findings of the Floodplain Risk Management Study and provide a priority program for implementation of the recommended works and measures in accordance with the Floodplain Development Manual.  The plan will detail how the existing and future flood risk within the study area will be managed.

Floodplain Risk Management Options

The following list of Floodplain Risk Management options presents some strategies that could be considered to minimise the risk and reduce the impact of flooding throughout the Tabourie Lake floodplain.  These options will be considered in further detail during the preparation of the Management Study and Plan.

Examples of Flood Management Options:

Flood Modification Options
• Construction of levees where properties are most at risk.
• Upgrading of drainage systems
• Revision of entrance management procedures.

Property Modification and Planning Control Options
• Building and development controls
• Voluntary house raising program (for selected properties)
• Voluntary house rebuilding subsidy scheme (for selected properties)
• Voluntary property purchase program (for selected properties).

Emergency Response Modification Options
• Revision of the Local Disaster Plan (DISPLAN)
• Public awareness and education—locality based flooding information for residents
• Public awareness and education—flooding information for schools
• Flood depth markers at major (flood affected) road crossings
• Continuation of existing public awareness and education campaigns
• Data collection strategies for future floods

Property Level Survey

As part of the study, a survey team from Rygate and West Surveyors will be collecting flood levels and ground levels for properties within the Tabourie Lake floodplain.  The data is being collected to enable us to accurately determine how properties are affected by flooding.  The levels will also be used to calculate damages resulting from flood events and to assess the effectiveness of proposed flood mitigation options.  The survey will be conducted between 30/09/2013 and 08/11/2013.  Please contact Council if you have any questions regarding this survey.

Consultation

During the Floodplain Risk Management Study and Plan process, consultation will be undertaken with the community in order to establish a comprehensive list of management options.

In addition to the Questionnaire, you will have further opportunities to comment on the direction of the project during the public exhibition periods of the Draft Risk Management Study and Plan, as well as a series of community workshops conducted by Council and Cardno.

The first of these workshops will be held on Wednesday 30 October at the Tabourie Rural Fire Service shed, commencing at 6.30pm.  The workshop will introduce the study, and discuss potential mitigation strategies with the community.

Any comments received during the workshop will be taken into account before finalisation of the study and plan. 

For further information regarding this project please contact;
Ailsa Schofield
P: (02) 4429 3237
F: (02) 4422 1816
E: schofielda@shoalhaven.nsw.gov.ua