Byron Bay; Managing the Triple Threat Rachel Jensen, James Flockton, Jo Tinnion Brisbane, May 2015 A...
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Transcript of Byron Bay; Managing the Triple Threat Rachel Jensen, James Flockton, Jo Tinnion Brisbane, May 2015 A...
![Page 1: Byron Bay; Managing the Triple Threat Rachel Jensen, James Flockton, Jo Tinnion Brisbane, May 2015 A Floodplain Risk Management Study for Catchment Flooding,](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649ee45503460f94bf2a42/html5/thumbnails/1.jpg)
Byron Bay; Managing the Triple Threat
Rachel Jensen, James Flockton, Jo TinnionBrisbane, May 2015
A Floodplain Risk Management Study for Catchment Flooding, Strom Surge and Local Stormwater
![Page 2: Byron Bay; Managing the Triple Threat Rachel Jensen, James Flockton, Jo Tinnion Brisbane, May 2015 A Floodplain Risk Management Study for Catchment Flooding,](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649ee45503460f94bf2a42/html5/thumbnails/2.jpg)
Byron Bay and Belongil Creek Catchment
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Belongil Catchment
Catchment Flooding
Storm Surge
Local Stormwater
ICOLLIsolation Risk
Low Hydraulic grade
Existing Drainage System
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• Mitigates storm tide dominated events (<20 year ARI)
• Worsens catchment flooding for rainfall dominated events (>100 year ARI)
Closed Creek Entrance Trained Open Creek Entrance
• Worsens storm tide dominated events (<20 year ARI)
• Reduces catchment flooding for rainfall dominated events (>100 year ARI)
• May increase inundation risk from sea level rise
• Significant ecological impacts
ICOLL Entrance Strategy
• Training of the entrance was not carried forward
• Instead: ICOLL Entrance Strategy, for occasional manual opening based on triggers
![Page 5: Byron Bay; Managing the Triple Threat Rachel Jensen, James Flockton, Jo Tinnion Brisbane, May 2015 A Floodplain Risk Management Study for Catchment Flooding,](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649ee45503460f94bf2a42/html5/thumbnails/5.jpg)
Drainage Strategy• Byron Bay town stormwater
drainage system capacity <1 year ARI (SMEC 2010)
• Low hydraulic grade• Concern regarding overreliance on
pumps and levees
• Increase in flood immunity for specific localised areas
• Introduction of wetland near Clarkes Beach
• Reduces pumps• Improves water quality
![Page 6: Byron Bay; Managing the Triple Threat Rachel Jensen, James Flockton, Jo Tinnion Brisbane, May 2015 A Floodplain Risk Management Study for Catchment Flooding,](https://reader035.fdocuments.net/reader035/viewer/2022062422/56649ee45503460f94bf2a42/html5/thumbnails/6.jpg)
Drainage Infrastructure Maintenance• Low hydraulic grade and existing
network capacity
• Annual Maintenance of major drainage lines
• Methods depend greatly on the surrounding vegetation and acid sulfate soil class
• Primary impact in smaller, more frequent events
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Evacuation Strategy
• Quick Catchment response time (<24hrs)
• Evacuation routes to Belongil Spit closed in events <10 year ARI
• Realignment of evacuation route• Prioritisation by SES of Belongil Spit• Additional rainfall gauge located in St
Helena, to facilitate advance warning
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SummaryICOLL Entrance
Strategy
Drainage Strategy
Drainage Maintenance
Evacuation Strategy
Catchment Flooding
Storm Surge
Stormwater
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Thank You