Hydrology and Flood Modelling

Flood studies are the important first step towards understanding and managing flood behaviour, whether for a large rural catchment, a highly developed urban area or for individual property and infrastructure developments.

Flood studies provide information about flood behaviour and risk, quantify the impact from proposed developments, and inform floodplain planning and water quality studies.

BMT WBM has a large and specialist team of flood engineers with extensive experience in hydrologic and hydraulic studies using a wide range of modelling software, including the internationally recognised and industry-leading package TUFLOW, which was developed in-house.

We offer the following specialist hydrologic and flood hydraulic management skills:

  • Flood frequency analysis for peak and low flows including Bayesian methods, using the Flike software.
  • Rainfall-runoff modelling including calibration, for design flood estimation
  • 1D and 2D floodplain modelling using a range of software(including TUFLOW)
  • Coastal lake flooding and dynamic entrance breakout analysis
  • Extreme flood estimation, including Probable Maximum Floods
  • Dambreak analysis
  • Real time flood forecasting and warning
  • Open channel hydraulics including unsteady flow
  • Bridge hydraulics and turbulence effect
  • Urban stormwater pipe network and retardation basin design and analysis.

Recent Relevant Projects

Moreton Bay Regional Floodplain Database (Queensland)

As the third largest local government area in the country, Moreton Bay Regional Council sought a new approach to flood modelling which would be consistent across the LGA and make the most of available time and resources. A three stage process was designed which first developed broad-scale flood models of the entire council area then used information from these models to identify additional data requirements for later stages of the project. A stage two pilot study of the Burpengary Creek catchment was finalised in 2010 with detailed models of remaining catchments now underway.

 Shoalhaven ICOLL Flood Studies (NSW)

The assessment of flooding behaviour for Intermittently Closed and Open Lake or Lagoon (ICOLL) systems requires the consideration of catchment rainfall-runoff process, in addition to the morphodynamics of the entrance berm and channel configuration and adjacent coastal conditions. BMT WBM has completed flood studies for three ICOLL in the Shoalhaven area including Burrill Lake, Conjola Lake and Tabourie Lake. The studies utilised the TUFLOW morphological model to simulate the entrance scouring processes, and their impact on peak flood water levels.

Dandenong Catchment Flood Mapping (Victoria)

The highly urbanised Dandenong catchment floods via overland flows and upwelling from the piped drainage system. A 2D/1D TUFLOW model was developed to dynamically link the underground network of 7000 pipes to an active floodplain model area of over 15 km2. BMT WBM developed additional capabilities and features of the TUFLOW software to meet the specific needs of client.


TUFLOW Products is a suite of advanced numerical engines and supporting tools for simulating free-surface water flow for urban waterways, rivers, floodplains, estuaries and coastlines.

TUFLOW Website