Rachel Jensen James Flockton Jo Tinnion Brisbane May 2015 A Floodplain Risk Management Study for Catchment Flooding Strom Surge and Local Stormwater Byron Bay and Belongil Creek Catchment ID: 445319
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Slide1
Byron Bay; Managing the Triple Threat
Rachel Jensen
, James Flockton, Jo Tinnion
Brisbane, May 2015
A Floodplain Risk Management Study for Catchment Flooding, Strom Surge and Local StormwaterSlide2
Byron Bay and Belongil Creek CatchmentSlide3
Belongil
Catchment
Catchment
Flooding
Storm Surge
Local Stormwater
ICOLL
Isolation Risk
Low Hydraulic grade
Existing Drainage SystemSlide4
Mitigates storm tide
dominated events
(<20
year ARI)
Worsens catchment flooding
for rainfall dominated events (>100 year ARI)
Closed Creek EntranceTrained 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 triggersSlide5
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 BeachReduces pumpsImproves water qualitySlide6
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 eventsSlide7
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 warningSlide8
Summary
ICOLL Entrance Strategy
Drainage Strategy
Drainage Maintenance
Evacuation Strategy
Catchment Flooding
Storm SurgeStormwaterSlide9
Thank You