Computational Flow Modelling

Achieving environmentally sound and sustainable solutions for water management is a challenge facing communities throughout the world.

Meeting this challenge requires modelling strategies that combine specialist expertise from a range of disciplines.

Our modelling approach is based on integration of environmental and engineering skills. This allows identification and development of innovative solutions.


We use a range of our own, custom-developed and third-party modelling packages. These include:

  • Haestad software - HEC-HMS, HEC-RAS, WATERCAD
  • Other software - ACES, BOSS SMS, Genesis, REF/DIF, SBEACH, SWAN, UNIBEST, SWMM. 

We specialise in several flow modelling fields, which are listed below:

Hydrological modelling
This involves analysis of catchment hydrology to assess water resource and determine runoff flows. We model peak design flows for control works, extreme low flows for ecological protection, optimisation of water supply demand management, provision of real time forecasts of flood levels based on telemetered rainfall data, and the impact of dam construction on the natural flow regimes.

Flood hazard mapping
We develop and validate combined sewer/stormwater network models using survey questionnaires and historical flood records. We model results used to identify flood hazard areas for both existing and future development scenarios, incorporating effects of climate change and identification of unsafe overland flows.

Network modelling
We develop and calibrate combined sewer/wastewater/stormwater network models using flow gauge data and assess both existing and future development scenarios and effects of climate change.  We use model results to investigate management and remedial measures to address combined and wastewater overflow containment, flood mitigation options and stormwater quality improvements.

Water supply modelling
We develop water supply network models to identify available pressure and fire flow volumes for both existing reticulation networks and proposed new subdivision developments. We model results to identify areas with inadequate flow and remedial measures.

River and open channel modelling
We develop and calibrate computational river models using historic flood levels and gauged flow data. We use model results to define flood hazard areas and support bank protection and stopbank design.

Coastal modelling
We develop detailed coastal models to analyse water level, current, wave and sediment transport processes. Our model results are used to delineate coastal hazard zones, assess long-term and short-term shoreline trends and assist in design of beach replenishment. We design canal waterways to optimise flushing, enhance water quality and minimise sedimentation.

Dam break analysis
We complete analysis of dam breach scenarios for hydropower and water supply dams, and identify at-risk properties, populations and vulnerable infrastructure.

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