2013-14 Flood Reserve Projects

An additional 36 projects were activated from the Reserve List in January 2014 valued at $17.3 million.

Project summaries

Armidale Dumaresq Council
Armidale urban overland flowpath study

The urban area of Armidale contains many small sub-catchments that drain directly to Dumaresq Creek or one of its main tributaries Martins Gully, Black Gully and Yoogoonda Gully. Design procedures for piped drainage systems to accommodate minor nuisance flooding have identified that in major storm events (100 year ARI), there are significant risks to people and property due to the lack of adequate overland flow paths to accommodate the above ground flows that are in excess of the capacity of the piped drainage systems. A study is required to identify the magnitude of these overland flows and the paths they will take in a major event. The existing piped drainage system (twin 1,200 millimetre diameter pipes) has an estimated capacity of 13 cubic metres per second and the street gutters and roadway has an estimated capacity of two cubic metres per second. There is a need to control and accommodate the excess 15 cubic metres per second flow to protect people and property.

Bathurst Regional Council
Bathurst flood mitigation - town levee associated works Gilmour Levee Street and Perthville Bridge

  1. Pump Station at Gilmour Street is to address the internal drainage within protected areas being adequately managed.
  2. Substation at Gilmour Street is to allow for provision of uninterrupted power to the pump station as well as to the residents in the altered situation after levee construction.
  3. Bridge widening and channelisation works to Queen Charlotte's Vale Creek at Perthville is designed as a pre-requisite to the proposed Perthville Bridge to be built as the final stage of the Bathurst Flood Mitigation - Town Levee network.

Blue Mountains City Council
Hazelbrook Creek and Woodford Creek catchment floodplain risk management study and plan

Initially council received a grant under the NSW Floodplain Management Program 2011-12 and 2012-13 to undertake a flood study for the Hazelbrook and Woodford Creeks Catchment within the Blue Mountains local government area. To complete the floodplain risk management process, council is keen to proceed to the next stage of the floodplain risk management process; that is, the floodplain risk management study and plan for the study catchment.

Blue Mountains City Council
Jamison Creek catchment floodplain risk management plan implementation feasibility study

Council has completed and adopted the Jamison Creek flood risk management plan in 2005. Council is keen to proceed to the next stage of the floodplain risk management process to undertake a feasibility study to implement the top four recommended measures listed on the plan. The top four management options are:

  1. Detention storage at the golf course near Toulon Avenue.
  2. Flood storage airspace at Wentworth Falls Lake.
  3. Increase pondage in Wentworth Falls Country Club ponds.
  4. Channel and flow path improvement.

Boorowa Council
Boorowa flood study and floodplain risk management study

The first phase of the project, Boorowa Flood Study, will identify the flooding impacts of the study area and provide information leading to flood planning levels and flood planning areas while the second phase, FRMS, will help to identify appropriate management and mitigation measures.

Byron Shire Council
Tallow Creek sandbar management strategy

In July 2009, council adopted the Tallow Creek FRMSP. Tallow Creek is situated on the southern outskirts of Byron Bay, which is within the Byron Shire Council local government area. Tallow Creek discharges to the ocean at the northern extent of Tallow Lake. The Tallow Creek mouth is obstructed by a naturally forming sand-bar. Sand-bar crest levels have been identified as the key factor in nuisance inundation. A management strategy was developed as part of the FRMSP, which includes the need for the artificial opening of the mouth and development of an Environmental Management Plan. An assessment under Part 5 of the EP&A Act is required (including preparation of a Review of Environmental Factors (REF)) for the artificial opening. Council wishes to engage consultants for the preparation of the REF and Environmental Management Plan.

Campbelltown City Council
Campbelltown locality floodplain risk management study and plan

Campbelltown City Council has completed the draft final Campbelltown locality flood study. This catchment is located in the Bow Bowing Bunbury Curran Creek catchment. As part of the floodplain risk management process as identified in the Floodplain Development Manual, the next stage will be the preparation of a FRMS&P. The purpose of the FRMS is to present the findings of the flood studies, identify, assess and compare various risk management options, and consider opportunities for environmental enhancement as part of mitigation works.

Campbelltown City Council
Ingleburn locality floodplain risk management study and plan

Campbelltown City Council has completed the draft final Ingleburn locality flood study. This catchment is located in the Bow Bowing Bunbury Curran Creek catchment. As part of the floodplain risk management process as identified in the Floodplain Development Manual, the next stage will be the preparation of a FRMS&P. The purpose of the FRMS is to present the findings of the flood studies, identify, assess and compare various risk management options, and consider opportunities for environmental enhancement as part of mitigation works.

City of Lithgow Council
Farmers Creek Lithgow flood mitigation scheme Stage 2

The project involves widening of Farmers Creek and bank stabilising using the same techniques as development for Stage 1. The widened channel will provide additional capacities, reduce velocities and provide protection to the adjacent residential area, that is Hermitage Flat. The project is 370 metres long and includes pre-cast concrete bank protection units.

Clarence Valley Council
Glenreagh floodplain risk management study and plan

The village of Glenreagh, located on the Orara River, is subject to regular flooding. In recognition of this issue, Clarence Valley Council and the NSW Government have provided funding for a FRMS&P. The first stage of this project was to undertake a flood study for the downstream section which includes the village of Glenreagh and this has now been completed, enabling council to proceed with the development of a FRMS&P of the flood study area.

Coffs Harbour City Council
Spagnolos Road detention basin – construction

Coffs Harbour suffered major flooding in 1996 and twice in 2009. There was extensive property and infrastructure damage and in 1996 one life was lost in the floods. The Coffs Creek FMP recommended the construction of four detention basins in the upper catchment of the creek. This basin is one that was identified and council has been working towards construction over the last few years. The basin will attenuate downstream flood flows and reduce flood levels, stemming property and infrastructure losses in future and reducing the risk of loss of life.

Coonamble Shire Council
Stage 1 - Coonamble levee upgrade

Previous studies have identified that upgrade of the levee is a high priority for the protection of the town. Coonamble levee upgrade stages 1, 2, 3 and 4 is estimated to cost $10.1 million. Council has split the upgrade into workable stages for practical and economic reasons. When complete, the levee will provide protection to the town centre of Coonamble.

Council of the City of Sydney
Centennial Park, Rushcutters Bay and Woolloomooloo catchments floodplain risk management studies and plans

It is proposed to prepare comprehensive FRMS&Ps for Rushcutters Bay, Centennial Park and Woolloomooloo catchments. Council has completed draft flood studies for these catchments with the grant assistance under the NSW Floodplain Management Program (FMP). The final flood study report for all three catchments is expected to be completed by June 2013. The proposed floodplain risk management study will be based on the flood study’s results. The risk management study will identify and assess flood risks in the catchments and investigate, compare and recommend various flood risk management measures taking into account environmental and socio-economic factors. The FMP will be based on the recommendations of the risk management study and community feedback. The plan will include a set of catchment-specific management measures which, if implemented, will alleviate flood risk to the community and financial losses.

Eurobodalla Shire Council
Tomakin/Mossy Point flood study

This project will prepare a flood study for the Tomaga River and Candalagan Creek catchment areas in accordance with the guidelines outlined in the NSW Floodplain Development Manual 2005. This is a significant flood-affected area that includes the settlements of Tomakin, Mossy Point, Broulee and Mogo within which over 250 residential lots and commercial properties are potentially below flood planning levels. The number of habitable buildings, including detached residential, medium density, affordable housing and tourism accommodation, is in excess of 450. The estuarine area will be significantly impacted by sea level rise with the same flood-affected properties being inundated more frequently under the influence of higher tidal levels.

Fairfield City Council
Smithfield West overland flood study

The Smithfield West overland catchment is one of 10 identified overland flow catchments within the Fairfield City local government area. It has been ranked seventh highest priority out of the 10 catchments. Overland flood studies in other higher ranked catchments have already been completed. Overland flooding in this catchment has been documented on a number of occasions and caused damage to properties. In April 2012 a flood event caused damage to properties and highlighted the urgency to undertake a comprehensive hydrologic and hydraulic study using 1D/2D modelling techniques. This will enable quantification of the flooding behaviour, notations on parcels for s.149 planning certificates, and future completion of a risk management study and plan.

Goulburn Mulwaree Council
Installation of flood warning system for Goulburn

The project involves installation of gauges by Goulburn Mulwaree Council (GMC) in consultation with the Bureau of Meteorology (BoM) (re rain gauges) and National Office of Water (NOW) (re river gauges) as recommended by the December 2012 Review of Flooding in Goulburn. To mitigate the effects of flash flooding this project will allow effective flood warning by using real-time rainfall and river flow data as the primary tool for flood prediction in conjunction with look-up tables and simple hydrology models. New infrastructure will be installed (owned and maintained by council) and new rating curves will be developed for flow estimates in the Wollondilly and Mulwaree catchments. The project specifications will be informed by expert input from BoM and GMC.

Greater Hume Shire Council
Holbrook, Henty and Culcairn floodplain risk management studies and plans

Major flooding was experienced in all three townships in October 2010 and again in March 2012. Council has expended a large amount of funds and time repairing damage caused by these events and does not currently have the capacity to complete this next stage of the FRM process without significant contributions from government grant funding. The Hume Highway bypass nearing completion at Holbrook also presents local and regional issues with respect to flooding and understanding the changed flooding regime and developing mitigating options are clear priorities for this town in particular.

Gunnedah Shire Council
Blackjack Creek flood mitigation project - riparian corridor/channel reconstruction

The Blackjack Creek flood mitigation project - riparian corridor/channel reconstruction aims to alleviate the risk of flooding to over 200 properties of which 104 are subject to above floor flooding in a one percent AEP flood event. The recommendation of the Blackjack Creek FRM plan is the reconstruction of Blackjack Creek to convey a one percent AEP flood event plus 500 mm freeboard. The civil works will realign/reconstruct, revegetate and rehabilitate Blackjack Creek and the riparian zone for 1.9 kilometres from north of Lincoln Street to 200 metres south of the Oxley Highway.

Lake Macquarie City Council
Winding Creek floodplain risk management study and plan

The project involves undertaking a comprehensive FRMS&P for the Winding Creek catchment. The catchment has a long history of flooding. Lake Macquarie's floodplain management committee and council have previously resolved to prepare a flood study and FRMS&P for the catchment. The Winding Creek flood study commenced in February 2011 and is expected to be completed during early 2013. The need for a floodplain risk management study/plan is driven by community pressure, including recognition of the need to address flooding problems throughout the entire length of the catchment. The catchment was impacted by a major flood event during the June long weekend of 2007, causing major damage to infrastructure and disruption to parts of the Cardiff central business district commercial centre for many months after the event. The study area is subject to major urban development pressures in relation to large government/private landholdings at Glendale Township, which includes the strategic concept to relocate Lake Macquarie City Council's entire civic precinct, as well as developing a large area of residential land upstream of Brush Creek at Glendale adjacent to Cameron Park).

Liverpool City Council
Brickmakers Creek flood mitigation works - Amalfi Park detention basin

Brickmakers Creek is a tributary of Cabramatta Creek, which flows through the suburbs of Casula, Lurnea and Liverpool to meet Cabramatta Creek in Warwick Farm and subsequently the Georges River. Flood studies undertaken in 1998 and 2004 identified Brickmakers Creek as the primary cause of major flooding of parts of the northern Liverpool CBD, even in smaller storm events. The flooding extends to the major state arterials the Hume and Cumberland Highways, causing major traffic delays into and out of Liverpool and surrounding areas and the residential areas adjoining the Hume Highway in the northern parts of the CBD. The FRMS&P adopted for Brickmakers Creek recommended a range of flood mitigation works. Among other flood mitigation works, the study recommended the provision of a detention basin at Amalfi Park to significantly attenuate flows and reduce flooding within the entire creek corridor and the northern CBD area. Under Stage 1 of flood mitigation works, channel improvement between Campbell Street and Orange Grove Road has been completed with funding assistance from the Natural Disaster Mitigation Program (NDMP) in 2010-11. Detailed investigation and design of Amalfi Park detention basin has been completed and construction documentation has been prepared. Investigation and design of the basin has been completed. Design of the basin has been reviewed by the NSW Dams Safety Committee (DSC) and works have been scheduled to commence in the 2013-14 program year.

Moree Plains Shire Council
Moree floodplain risk management plan review with 2D model to improve land use planning and evaluation of the plan's strategies

The FRM plan for Moree and Environs was completed in 2008, with a number of recommendations listed. A review of this plan, as per the current recommendations, is now appropriate with a flood study involving 2D modelling of the 10 percent, five percent and one percent and PMF flood event necessary to give outputs such as velocities, levels, extents and fully developed hydrographs to clarify the likely impacts, timing and duration of inundation.

Muswellbrook Shire Council
Denman levee - flood gate upgrades

Implementation of feasibility study recommendations:

9.1 Flood gates
Supplement manual gates with elastomeric in-line check valve to reduce risks associated with manual operation and a mechanical device with many moving parts.)

9.2 Existing flap gate
Maintenance should continue on the existing flap gate on the 375 millimetre pipe. The pipe should be covered with a rock ballast to avoid buoyancy and a dissipation area constructed at the outlet to avoid any further local erosion. As this gate is small, it can be sealed by sandbagging if failure occurs during storm events.

9.3 Closing the gap in the Golden Highway
A number of systems are available to close the gap at Crinoline Road. The automatic systems and those that fold into strip footings are very expensive and would be vulnerable to wear and damage from vehicles. The portable systems range from water-filled bags to metal walls bolted into concrete footings. Some of these rely on a flat surface in which they are installed. For this application, the Geodesign system appears to be the most cost-effective and reliable. It provides an easy to erect system with no equipment required if stored nearby. It can cope with the uneven ground across the roadway and shoulders. The waterproof membrane would be easy to replace or repair if damaged. Installing concrete end walls to make installation simpler and allow access to the levee crest for vehicles is recommended.

Palerang Council
Captains Flat floodplain risk management study and plan

The FRMS&P will consider a list of options for reducing flood impacts in the town of Captains Flat and, following community consultation, a plan will be adopted by council to implement the most suitable measures. The project will follow the Captains Flat Flood Study which will be completed in the current financial year.

Pittwater Council
McCarrs Creek, Mona Vale and Bayview flood study review

This flood study includes an update of a previous flood study for Mona Vale/Bayview completed in 2003 with the addition of the adjacent McCarrs Creek catchment. The suburbs of Mona Vale, Bayview and Church Point are relatively low-lying, much urbanised town centres with residential, commercial and industrial areas within close proximity of Pittwater estuary. This section of the study area has been heavily modified with redirected and piped watercourses. The suburb of Ingleside is steep and quite rural. A major creek system called McCarrs Creek flows from the top of the catchment through the residential and bush areas to Pittwater estuary. Both catchments are affected by estuarine, creek and overland flow flooding which poses risk to life and property. It is proposed to analyse the two catchments separately but present the results within the one report.

Pittwater Council
Avalon to Palm Beach floodplain risk management study and plan

The Avalon to Palm Beach FRMS&P will provide strategic direction for managing flooding in the Careel Creek Catchment as well as the overland flow paths in the surrounding suburbs of Avalon, part of Bilgola Plateau, Clareville, Whale Beach and Palm Beach. The FRMS&P will follow on from the Careel Creek Flood Study (2013) and the Draft Pittwater Overland Flow Flood Study (2012), which identified 717 properties at risk in the 1 percent AEP in the study area. The project will involve assessing the risk to life and proposing suitable flood response modification management options, including an assessment of the impact of structural integrity of dwellings, duration of inundation, potential evacuation routes and evacuation capability for both mainstream and overland flow flooding. It is proposed to investigate the acceptable criteria for management through the National Emergency Risk Assessment Guidelines (2010). The study will also identify any flood modification management options and assess their feasibility, effectiveness and impacts. Specific property modification measures will also be proposed such as the use of council's land use planning Development Control Plan and strategic planning.

Shellharbour City Council
Oak Flats, Oakey Creek and Skiway Park flood study

This project for the Oak Flats, Oakey Creek and Skiway Park catchments will produce a flood study of the catchments to define the nature and the extent of the flood behaviour. The flood study will also increase public awareness of flooding within the catchments and assist council and key emergency personnel in creating community awareness of the potential effects of flooding.

Sutherland Shire Council
Gwawley Bay catchment floodplain risk management study and plan

Development of the plan follows the recent completion of the Gwawley Bay catchment flood study, which defined flood behaviour within the catchment. The plan will further investigate flooding problems and include measures to reduce/manage the flood risk.

Tamworth Regional Council
Bendemeer floodplain risk management study and plan

This project will undertake an FRM study and develop an FRM plan for the town of Bendemeer following on from the flood study completed in 2012.

The Council of the Shire of Hornsby
Hornsby Shire floodplain risk management study and plan

This project is for the preparation of a FRMS&P for the Hornsby Shire local government area. Hornsby Council has, through its consultants, recently finalised an overland flood study of the main residential areas within its local government area. Mainstream flooding along reaches of the Hawkesbury River have been undertaken in earlier flood studies. The purpose of this project is to use this information and coordinate the various stakeholders to implement a FRMS&P in accordance with the NSW Floodplain Development Manual. The overall outcome will be to provide a coordinated strategy for the development of flood-prone land within the shire and update procedures that can be used by council and the various stakeholders during flood events. This will provide a framework for future development and result in planning directions for developments in assessed flood-prone areas within the shire.

Upper Lachlan Shire Council
Upper Lachlan flood risk management study and plan for four villages

This project will develop an FRMS&P for the villages of Collector, Gunning, Crookwell and Taralga that follows the flood study and addresses the existing, future and continuing flood problems in accordance with the NSW Government’s Flood Policy, as detailed in the Floodplain Development Manual to provide long-term solutions to the flood impacts in these villages.

Warringah Council
Manly Lagoon floodplain risk management study and plan

The Manly Lagoon FRMS&P will follow on from the flood study (2013). The FRMS will investigate what can be done to reduce or manage the impact of flooding within the catchment by collating and assessing preferred risk management options, then making recommendations for a mix of strategies. Manly Lagoon is an intermittently closed/open lake or lagoon and one particular option for investigation will be the management of the entrance berm, taking into account potential climate change. The management of flow releases from upstream Manly Dam will also be specifically investigated. The FRMP will provide strategic direction for managing flooding within the Manly Lagoon catchment. It will comprise a coordinated mix of management measures to address existing, future and continuing risks, along with a proposal for timings and budgets. The project is a joint project between Warringah and Manly Councils, with Warringah Council responsible for day-to-day project management.

Warringah Council
Narrabeen Lagoon floodplain risk management study and plan

The Narrabeen Lagoon FRMS&P will follow on from the flood study (2013). The FRMS will investigate what can be done to reduce or manage the impact of flooding within the catchment by collating and assessing preferred risk management options, then making recommendations for a mix of strategies. Narrabeen Lagoon is an intermittently closed/open lake or lagoon and one particular option for investigation will be the management of the entrance berm, taking into account potential climate change. The FRMP will provide strategic direction for managing flooding within the Narrabeen Lagoon catchment. It will comprise a coordinated mix of management measures to address existing, future and continuing risks, along with a proposal for timings and budgets. The project is a joint project between Warringah and Pittwater Councils, with Warringah Council responsible for day-to-day project management.

Woollahra Municipal Council
Watsons Bay flood risk management study and plan

Council has completed a number of flood/drainage studies in the Watsons Bay area and has a prioritised works program for the area. However recent flooding has highlighted the need to extend the area covered by the flood studies to include the adjacent overland flow paths. The existing data then needs to be compiled into one FRMS&P. This will include community consultation to inform residents of the flood hazards in their area.

Wyong Shire Council
Lakes Residual Urban Catchments Flood Study (Stage 1)

The project involves a flood study of the Lakes Residual Urban Catchments. This study is intended to be a coarse, two-dimensional flood study, not necessarily to set flood planning levels, but simply to identify flood control lots in existing urban areas for the sake of the Electronic Housing Code. The study would consider a five metre grid size and assume the piped drainage system is blocked. As such, it is envisaged that only large flood events would be considered.

Yass Valley Council
Yass Town flood study

The township of Yass (pop 5,591) is the economic centre of the Yass Valley local government area and is currently experiencing significant population growth and development pressures. Presently, the risks associated with flooding, due to the Yass River (which runs through the township), are not fully understood and the recent significant upgrade to the water supply dam that is located on the northern fringe of the township necessitates the completion of a flood study. This flood study will define flood behaviour and enable council to appropriately manage existing and future flood risks within Yass. It is intended that this flood study will incorporate a dam break study component, which will be fully funded by council, and will cover all flooding issues and sources of flooding. In order to meet the long-term infrastructure goals outlined in Yass Valley Council's Community Strategic Plan (2011-30), the preparation of a flood study for the Yass River has been identified as a priority. This flood study will inform local environmental planning, planning and infrastructure decision-making and associated risk management planning. The study will be completed in accordance with the processes and policy outlined in the Floodplain Development Manual (2005) and in conjunction with the council-funded Dam Break Study.

Yass Valley Council
Sutton and Gundaroo floodplain risk management studies and plans

The villages of Gundaroo (population 402) and Sutton (population 229) are located in the Yass Valley local government area. The villages are in close proximity to the ACT and the city of Canberra. Both villages are experiencing significant development pressures as ACT housing prices remain high and people there look for properties that offer a more rural life style. The villages also lie in the Sydney-Canberra corridor. The risks due to flooding in the two villages are not at all understood although there is a long history of flooding from the Yass River (which runs along the periphery of both villages). No previous flood studies have been completed and council is looking to develop strategies to assist in future planning activities. In the light of these significant development pressures and to meet the long-term infrastructure goals outlined in Yass Valley Council's Community Strategic Plan (2011-30), the preparation of a floodplain risk management study and plan for these villages has been identified as a priority. Before further development of these villages and surrounding rural residential areas can be planned, it is essential that council understands the risks due to flooding. The study and plan will inform local environmental and risk management planning and identify future developable land and associated planning and infrastructure decision-making (including development controls). The study will be completed in accordance with the processes and policy outlined in the Floodplain Development Manual (2005).

Page last updated: 12 March 2014