FLOOD HAZARDS

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We are passionate about delivering better ways of managing 
the risk associated with flooding now and in the future

OUR SERVICES

 

We deliver national-scale to catchment-specific flood studies, hydrological studies, hydrologist reports, hydraulic studies, flood risk management plans, forecasting and early warning systems, bridge assessments, scour assessments, development assessments, stormwater management plans, water quality management, and catchment management plans.

Our work includes:

  • Numerical modelling using open-source software or proprietary systems from US Army Corp, DHI, Deltares, BMT

  • Catchment studies (ESRI/MapInfo/QGIS, CatchmentSim, eWater, SWAT) 

  • Hydrological modelling (URBS, XPRAFTS, WBNM, RORB, HEC)

  • Hydraulic modelling (TUFLOW, Delft, HECRAS, MIKE11 and MIKE 21, ANUGA)

  • Water quality (DELFT3D, SWAT, MUSIC)

  • Economic analysis & feasibility studies (FRISM, Water Ryde)

  • Development & hydraulic impact assessment
     

OUR PROJECTS

Wooli River Hydrology Assessment, Flood Study and FRMP

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New hydrology and flood risk study for the Wooli River estuary, in NSW.  Tasks included the collection and review of hydrologic data including rainfall and gauge records, new ground and bathymetric data collection, development of an URBS hydrological model and TUFLOW hydraulic model for the catchment, development of a Delft3D model to understand the interaction between coastal and fluvial processes.  The project outputs included new flood mapping to support land use planning and disaster management

Tweed Coastal Creeks Flood Study and Early Warning System

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A hydrological modelling (URBS) and design flood estimation project in line with ARR2019.  Task included review of gauge information, update of an existing TUFLOW model for the catchment, and preparation of a flood intelligence report for flash flooding behaviour in the upper catchment.  All models developed within the project were integrated into a new Flash Flood Early Warning System and alerting dashboard.

Far North Queensland Shire-Wide Flood Mapping

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A broad scale hydrology and flood mapping project to perform shire-wide hydrologic analysis, pluvial (rainfall) modelling, fluvial (river) modelling and development of flood maps for the region.  Flood maps covered six return periods, from Q20 to Q1500, and were delivered at a 5m resolution throughout the shire for use by Council, disaster managers and first responders.

Kempsey Shire Coastal Vulnerability Area Mapping

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New Coastal Vulnerability Area (CVA) mapping under the NSW coastal reforms.  Detailed hydrodynamic modelling and analysis of five hazards; (1) Beach erosion, (2) Shoreline recession, (3) Coastal lake or watercourse entrance instability, (4) Coastal inundation, (5) Tidal inundation.  Hazard mapping was undertaken to identify future assets, infrastructure and land affected by coastal processes.

NSW March 2021 floods assessment and event footprint

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Hydrology assessments for the NSW March 2021 floods.  This included on-ground assessment, damage assessments, event footprint mapping and exposure analysis.  Rainfall analysis showed the highest recorded gauges receiving 50-year to 200-year return period rain for various durations.  Mapping of the flood extent show between 20 to 50-year flood levels in the downstream catchment.

Etta Plains Flood Study and Hydraulic Assessment

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A large-scale flood study including hydrologic and hydraulic modelling, applying flood estimation approaches consistent with ARR2019 and hydraulic assessment of proposed development in outback Australia.  Tasks included joint hydrologic-hydraulic calibration, derivation of new rating tables, flood hazard mapping and engineering design of mitigation structures. 

Clarence Valley Council Shire-Wide Flood Mapping

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Large scale flood mapping throughout the Clarence Valley Council region, spanning an area over 10,000 km2.  This included catchment delineation, hydrologic assessment and flood modelling at a 5m resolution, between 1 in 20 to 1,500-year return periods.  Hazard maps are now in use by Council, disaster managers and planning officers.

Australia national flood hazard mapping

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A national assessment of hydrology and flood risk which resulted in Australia-wide flood mapping at a 30m resolution.  Flows were derived at 2km chainage along every watercourse, incorporating new Australian Rainfall and Runoff (2016) rainfall and flow datasets. Maps include 20, 50, 10, 200, 500, 1500-year return periods.  New updates are now being undertaken at a 30m resolution.

Pacific Flood Maps

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Flood Hazard Mapping completed for every inhabited island, including key locations at Palau, Fiji, Papua New Guinea, Samoa, Soloman Is., Vanuatu and Tonga.  Mapping has been developed based on assessment of long-term rainfall records, river records, and statistical analysis to create new Intensity-Frequency-Duration datasets.  Numerical Modelling has been undertaken using JFlow - dedicated flood modelling software run on the worlds largest dedicated flood mapping computer cluster.  Elevation has been based on Intermap’s NEXTMap WORLD30 DSM and a variety of bareearth DTM datasets were used.

Design event estimation for Williams River, QLD

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Estimation of the 1 in 100-year peak flood level, depth and velocity across rural catchments in the Cloncurry Shire, on the Williams River, QLD. The  rural location meant that no gauging stations were located within the site vicinity, and instead extreme conditions had to be estimated using regional Flood Frequency Analysis (FFA) techniques, and 2D hydraulic flood modelling of both flows and rainfall patterns, following Australian Rainfall and Runoff (2016).