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SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
Technology and Rural Floodplain Management: future-proofing flood-dependent wetlands
Joanna Taylor, Simon Morton, Dan Mawer and Neal Albert
J. Taylor/OEH
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
• Facilitate the orderly passage of floodwater through the system
• Manage risks to life and property from the effects of flooding
• Maintain flood connectivity to ecological and cultural assets.
Floodplain management: guiding principles
GwydirBarwon-DarlingPlans in prep.
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
J. Taylor/OEH J. Taylor/OEH
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
Boobera Lagoon in the Border Rivers (G. Pezzimenti/OEH)
Bungle Gully Dam in the Lower Namoi (J. Taylor/OEH)
Brolga near the Gwydir wetlands (J. Taylor/OEH)
Lake Goran in the Upper Namoi (G. Pezzimenti/OEH)
Macquarie Marshes in the Macquarie (S. Hunter/OEH)
Horseshoe Lagoon in the Barwon-Darling (S. Hunter/OEH)
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
Hydraulic models:
• mainly 2D MIKE 21 Flexible Mesh models
• built using 1 m LiDAR Digital Elevation Model or DEM
• account for developments and structures
• fit-for-purpose strategic models
• cover approx. 44,000 km2 , 5 % of NSW or 1.4 Belgiums!
Capture, use, share: location-based flood information
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
Managing cumulative impacts
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
Managing cumulative impacts
ArcGIS Online for public scrutiny of draft management zones.
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
https://trade.maps.arcgis.com/apps/webappviewer/index.html?id=8040c99bb63646c7b0d12d63dec69595
(G. Pezzimenti/OEH)
Infrastructure protection works (ADS40))Below-ground supply channel (G. Pezzimenti/OEH))
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
Managing cumulative impacts
Only minor works can be built in MZ A/DWindella
Crinolyn
Goddard’s Lease
Old Dromana
Levee-protected cotton crops(J. Taylor/OEH))
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
Managing cumulative impacts
Larger works can be built in MZB/C, subject to rigorous assessment.
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
• Sections are drawn across floodplain
• Peak design flood flows were estimated
• Compared existing model flows with proposed model flows to ensure flows are ± 5%.
Managing cumulative impacts
Floodplain scale
MANAGED BY
Property scale
Existingdevelopment
conditions
Proposeddevelopment
conditions
Pre-development
conditions
a) Overall change
b) Current change
c) Proposed change
SYDNEY, AUSTRALIA | 14 -18 October 2018
MANAGED BY
Property scale
Existingdevelopment
conditions
Proposeddevelopment
conditions
Pre-development
conditions
a) Overall change
b) Current change
c) Proposed change
SYDNEY, AUSTRALIA | 14 -18 October 2018
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
Better information and technology includes:
• Improvements in available elevation data sets
• Flexible Mesh modelling approach
• Use of Graphical Processing Units (GPUs) to speedup simulations
Lesson Learnt – start with good LiDAR
Better technology, better assessments
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
J. Taylor/OEH J. Taylor/OEHJ. Taylor/OEH J. Taylor/OEH
SYDNEY, AUSTRALIA | 14 -18 October 2018 MANAGED BY
Acknowledgements
This work was undertaken as part of the Healthy Floodplains Project, which is funded by the Australian Government’s Sustainable Rural Water Use & Infrastructure Program as part of the implementation of the Murray-Darling Basin Plan
The project team is the work of more names than can be listed here – with representatives from the Office of Environment & Heritage (OEH), Department of Industry Water, Department of Primary Industries – Fisheries, the Natural Resources Access Regulator and WaterNSW.
We would like to acknowledge our immediate OEH project team: Dan Mawer and Neal Albert who helped write the abstract, as well asGeoff Simpson, Mal Ridges, Michelle Cavallaro, Peter Sobinoff and Simon Hunter.
More information can be found at: https://www.industry.nsw.gov.au/water/plans-programs/healthy-floodplains-project/plans