Below is a list of flood-related issues that the Australian and NSW governments, along with local governments and county councils in the Northern Rivers region, will engage with rather than addressing the rampaging elephant in the room.
That is, the continued support of extensive urban development on floodplains in the heavily populated state coastal zone and, current environmental and planning legislation which is an inadequate vehicle to deal with any and all risk associated with an Australian climate undergoing continual uncharted change.
Flood modelling, mapping, studies, levee rehabilitation, warning signs, new gauges, on paper evacuation routes and the like are worth very little if the NSW Perrottet Government and councils across the state (including those in Northern NSW) continue to allow developers to build on identified paths floods are known to travel, or if by consenting to the raising of largescale subdivision ground heights on flood prone land both government and councils redirect groundwater flows causing further riverine and stormwater inundation in towns and villages during heavy rainfall events.
The Northern NSW list.......
NSW Dept. of Planning and the Environment, Floodplain management grants awarded and project summaries, information retrieved 26 September 2022.
2021-22 NSW Government Floodplain Management Grants:
Tweed Shire Council
Tweed Heads south levee overtopping and drainage study
This project will provide a local flood risk management study for the South Tweed business district and residential area. The study will examine flooding, drainage and the hydraulic characteristics of the local levee and drainage systems, in order to identify potential flood risk mitigation and improvement measures. It will also include analysis of future flooding risks such as sea level rise and climate change. The findings of the study will inform development controls in the region and provide a local floodplain risk management strategy, including measures to be implemented within the area to reduce the impacts of flooding.
Raising and Extension of Tweed Heads South Levee is expected to cost $27 million over a 30 year period.
Byron Shire Council
Debris control measures for Federation Bridge
Federation Bridge is the major bridge in Mullumbimby crossing the Brunswick River. Federation Bridge's pile design makes the structure vulnerable to the collection of debris, which causes a major blockage to floodway flow in the Brunswick River at Mullumbimby. This was a contributing factor to the increase in flood levels within Mullumbimby during the 2017 flood event. This project will undertake the investigation, design and construction of bridge control measures to reduce the potential of river blockage at Federation Bridge.
2020-21 NSW Government Joint Grants through the Floodplain Management Grants and Floodplain Grants Scheme, which is funded by Resilience NSW:
Lismore City Council
Review and update Lismore flood risk management plan
Lismore experienced a major flood event in March 2017, which peaked at 11.59m Australian height datum (Lismore Rowing Club gauge) and saw the central business district levee overtopped for the first time since it was completed in 2005. Rous County Council recently prepared a flood risk management study following the 2017 event. This project will update Lismore's flood risk management plan, based on the findings of the flood risk management study.
Richmond Valley Council
Update the Richmond River flood study
This project will produce a single consistent flood model for the Richmond Valley local government area from Casino to Broadwater. This involves rebuilding the Richmond River flood model (2010) for use in modern flood model software, inclusion of calibrated modelling for the Casino township, and the merging of the Evans River flood study (2014) and the Pacific Highway Woolgoolga to Ballina road upgrade flood modelling. This will result in the elimination of disparity between the Richmond River and Casino models where they interface and overlap.
2019-20 NSW Government Joint Grants through the Floodplain Management Grants and Floodplain Grants Scheme, which is funded by the NSW Office of Emergency Management:
Clarence Valley Council
Alice Street levee rehabilitation – investigation and design
A section of the levee between Queen and Alice Street has been identified as being at risk due to scouring and undercutting, potentially causing slips that will risk the stability of the levee. This project will carry out a geotechnical assessment on the stability of the flood levee and riverbank and recommend options to improve riverbank stability in this area.
Wooli flood study and management plan – review and update
This project will update the 1999 Wooli floodplain risk management plan to incorporate recent flood events and best practice modelling to predict flood levels. The updated flood study and plan for Wooli will allow for informed decisions on managing flood risk.
Tweed Shire Council
Detailed design of Murwillumbah central business district levee spillway
During the March 2017 flood, the earthen section of the Murwillumbah central business district levee was overtopped in a few localised low points. The overtopping occurred in an unexpected location and in an uncontrolled nature. The Murwillumbah central business district levee and drainage study recommended the remediation of the levee low points and installation of a formalised spillway to achieve safe and controlled overtopping of the levee during events equal to or greater than the levee crest. This project will complete a detailed design for a spillway and levee rehabilitation.
Update and expansion of the Tweed Valley flood study
The current Tweed Valley flood study was completed in 2009 and covered only the more populated areas of the Tweed. Historical records and anecdotal evidence suggest that there are many more properties in the Tweed Shire's rural areas and villages that are exposed to flooding. This project proposes to expand the Tweed Valley flood study into the upper catchment to cover the villages of Chillingham, Tyalgum, Kunghur, Uki, Stokers Siding, Bilambil and the rural areas in between. Flood intelligence in these areas will allow Council to identify high-risk areas/properties.
Kyogle Council
Bonalbo flood study
Council will undertake a flood study to improve their understanding of flood behaviour and impacts, and to make better informed management decisions in relation to flood risk in Bonalbo. This study will also provide a sound technical basis for any further flood risk management investigations in the area.
2018-19 NSW Government Joint Grants through the Floodplain Management Grants and Floodplain Grants Scheme, which is jointly funded by the NSW Office of Emergency Management and the Australian Government:
Clarence Valley Council
Bluff Bridge (Orara River) flood monitoring
This project will install a remotely monitored flood gauge in the Orara River at Bluff Bridge to enable residents to be aware of when the road is closed. Flooding of the Orara River has caused the Orara Way to close on many occasions at this location. The closure causes isolation and inconvenience to the community of Glenreagh and surrounds as well as through traffic between Grafton and Coffs Harbour.
The Bluff Bridge Flood Monitoring System was switched on in August-September 2020.
Lower Clarence rural floodplain risk management study and plan
This project will prepare a rural floodplain risk management study and plan. In 2014, a report on the management of flood mitigation assets identified that the Council may be maintaining floodplain works that have little or no flood mitigation benefit or that perpetuate environmental harm. The report concluded that the best option was to prepare a new floodplain risk management plans for the rural floodplain.
Tweed Shire Council
Coastal Creeks flash flood warning system
Burringbar, Mooball and Crabbes creeks are subjected to flash flooding with little or no warning. This project will undertake modelling to establish the gauge triggers necessary for the flash flood warning system to be effective. Once triggers are determined the warning system will be investigated and implemented. Extensive community engagement is proposed to ensure residents are aware of the action they should take.
Community flood markers
This project involves the fabrication and installation of flood markers and signage to record the level of the March 2017 flood event in various impacted suburbs. This includes updating previous signage commemorating the 1954 flood, as well as additional markers on street poles. The signage project will be complemented by consultation activities and media to raise flood awareness in these communities.
2017-18 NSW Government Joint Grants through the Floodplain Management Grants and Floodplain Grants Scheme, which is jointly funded by the NSW Office of Emergency Management and the Australian Government:
Clarence Valley Council
Clarence Valley floor level surveys
There is a lack of knowledge regarding floor heights of buildings located within the Clarence Valley floodplain. This project will undertake floor height surveys of these buildings. This information will be used in conjunction with the lower Clarence flood model for a variety of floodplain management purposes, including refining the evacuation strategies; assisting with the cost/benefit assessments for potential levee augmentations to improve flood immunity; and identify properties that would be eligible for potential future house raising assistance.
Tweed Shire Council
Enhance Burringbar/Mooball/Crabbes Creek gauge network
There are currently 2 rain gauges in the Burringbar and upper Crabbes Creek catchments. This project will install 2 additional rain gauges upstream of Burringbar to improve flood warning in the area.
Incorporate Tumbulgum gauge into flood warning system
The automatic stream gauge at Tumbulgum is not currently included in the Bureau of Meteorology's formal flood warning network. This project will incorporate the gauge at Tumbulgum into the Bureau of Meteorology flood warning network. This will improve predictions of flood height in the mid catchment, by including influences from the tide and Rous River, and will improve flood warnings and real-time evacuation planning.
South Murwillumbah – Condong flow path/levee performance study
This project will deliver a flood study for the south Murwillumbah business district and residential area. The study will examine flooding and the hydraulic characteristics of south Murwillumbah Condong floodway, including the effectiveness of the current levee system. The findings of the study will inform development controls in the region and provide a floodplain risk strategy, including potential property modification measures such as land acquisition and structural works to maintain or improve the efficiency of the floodway.
2016-17 NSW Government Joint Grants through the Floodplain Management Program and Floodplain Grants Scheme, which is jointly funded by the NSW Office of Emergency Management and the Australian Government.
Ballina Shire Council
Ballina Island and West Ballina Flood Protection Feasibility Study and Plan
This project will develop a strategy to protect the existing urban footprint of Ballina Island and West Ballina below the one percent annual exceedance probability flood level from mainstream, storm surge and local overland flooding that can be adapted for future sea level rise. The strategy will be used to implement development controls, identify feasible infrastructure upgrades and structural protection measures available to reduce the impacts of flooding to Ballina Island and West Ballina.
Byron Shire Council
North Byron Flood Risk Management Study and Plan
There is considerable development pressure in the North Byron catchment and Council is currently preparing a future residential development strategy. This project will develop a risk management study and plan for the area to ensure that the existing and future development will be managed in accordance with flood hazards.
Kyogle Council
Tabulam Village floodplain risk management study and plan
The village of Tabulam is flood prone and major flooding has impacted on the village and its residents in the past. Development of the Tabulam floodplain risk management study and plan will assist in identifying the way to manage the risk of flooding impacts within the village area. This will provide guidance for the control measures required for the existing developed area and identify risks involved in new development. Beneficial control measures will be identified and implemented.
Rous County Council
Tuckean floodgate management plan review
The Tuckean floodgate management plan review will address the functional effectiveness and sustainability of Council's infrastructure on the Northern Rivers of NSW. This project will inform and update the Richmond Catchment flood model by providing a refinement of scale to allow feeder canals, drains and tidal variation inclusion. This approach will allow greater understanding of the hydrological function of the Tuckean floodgate, which is known as an acid hotspot. This will also allow Council to revise floodgate management plans in the area and support the community's desire for improved water quality in the Richmond River.
Tweed Shire Council
South Murwillumbah voluntary purchase scheme
A voluntary purchase scheme is in place for high hazard flood affected homes along the Tweed River frontage of River Street, South Murwillumbah. The existing earthen levee provides limited low level protection from small flood events. Properties have been purchased in the region over the past twenty years. Only a few eligible properties remain, and it is difficult to predict when these will be purchased, given the voluntary nature of the program and the owner's willingness to sell their property. Once removed, the properties will become public open space to be enjoyed by the wider Tweed community.
2015-16 NSW Government Joint Grants through the Floodplain Management Program and Floodplain Risk Management Grants Scheme, which was jointly funded by the NSW Office of Emergency Management and the Australian Government.
Richmond River County Council
Richmond Catchment Flood Model compilation and Australian height datum adjustment
This project is designed to refine the existing Richmond River catchment flood models and aims to link all existing flood models into a catchment model to provide continuity across the catchment.
Tweed Shire Council
South Murwillumbah Voluntary Purchase Scheme
A voluntary purchase scheme is in place for high hazard flood affected homes along the Tweed River frontage of River Street South Murwillumbah. This project will provide funding for the purchase of the few eligible properties that remain if the opportunity arises to purchase the property.
2014-15 NSW Government Joint Grants through the Floodplain Management Program and Floodplain Risk Management Grants Scheme, which was jointly funded by the NSW Office of Emergency Management and the Australian Government.
Kyogle Council
Kyogle – flood modification measures: construction activities
This project involves construction activities associated with the structural flood modification measures identified in Council's Floodplain Risk Management Plan, including a partial ring levee and additional Fawcetts Creek flood breakout.
Richmond River County Council
Water Quality Monitoring – Richmond River Catchment
This project will undertake water quality monitoring. The water quality monitoring is linked to the flood mitigation systems as it triggers the opening and closure thresholds (water level and pH) of the floodgate.
Richmond Valley flood warning and evacuation planning system - rural home floor
This project will collect ground and floor level data that can be used in flood warning and evacuation systems and detail homes that are a priority for house raising or evacuation.
Lismore rural evacuation – house floor level plan
This project will survey the floor levels of houses in the most impacted areas. The information will inform potential purchasers of the risks associated with individual houses in the rural area and at the same time give emergency response agencies good information on where resources should be deployed in a flood.
Flood evacuation South Lismore
This project will examine the option for constructing a new high level escape route to high ground for South Lismore.
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