• Overview
  • Water Services
  • CatchmentSIM
  • Storm Injector
  • TRIM

Catchment Simulation Solutions provides engineering consulting services in the water field with a special focus on hydrologic and hydraulic modelling. 

We also develop and market several software product in this field, including our flagship product CatchmentSIM for mapping subcatchments and creating hydrologic models. We also develop Storm Injector for automating design storm rainfall runoff modelling. Finally, we develop TRIM, a complete simulation manager for TUFLOW.


CSS has considerable expertise in a full suite of flood-related disciplines. We strive to provide our clients with access to the latest available software, systems and modelling tools to improve efficiency and deliver innovative and timely outcomes. We are familiar with a range of 1, 2 and 3-dimensional hydraulic software, lumped and distributed hydrologic software and GIS software. This includes:

Hydrologic Models

    • WBNM
    • RORB
    • GSSHA
    • ICPR
    • URBS
    • HEC-HMS

Hydraulic Models

    • TUFLOW
    • RMA-2
    • RMA-10
    • HEC-RAS
    • ICPR
    • MIKE-11

Water Quality Models

    • MUSIC
    • Source Catchments


  • MapInfo
  • ArcGIS
  • MapInfo
  • WaterRide
  • CatchmentSIM

 Some of our sample projects are shown below.

Sample Projects

  • Campbelltown Flood Study +

    CSS was engaged by Campbelltown City Council to prepare a detailed flood study for the Campbelltown Locality. The purpose of the flood study was to define flood behaviour for existing and future conditions. In accordance with the requirements of the NSW Government's Floodplain Development Manual (2005), both mainstream and overland flooding needed to be considered as part of the study.
    Campbelltown Flood Study
    Read More
  • Sydney Harbour Subcatchment Delineation +

    CSS were engaged by the Sydney Metropolitan CMA to complete subcatchment delineation for the Lower Parramatta River, Lane Cove River and Middle Harbour catchments, which occupy approximately 350 km2 of the Sydney urban area.  The project was completed as part of the Sydney Harbour Water Quality Improvement Plan.
    Sydney Harbour Subcatchment Delineation
    Read More
  • Parramatta River Source Catchments Modelling +

    CSS was engaged by the Sydney Metropolitan CMA to prepare Catchment Pollutant Export Models (CPEM) for the Upper and Lower Parramatta River catchments. The CPEM were developed for the Sydney Harbour Water Quality Improvement Plan using the Source Catchments software.

    Parramatta River Source Catchments Modelling
    Read More
  • The Hills Urban Overland Flowpath Mapping +

    CSS were engaged by The Hills Shire Council to map all urban overland flow path alignments in The Hills Shire Council LGA. The purpose of the study was to help identify all allotments that may be traversed by an urban overland flow path and which may be subject to a flood-related development controls (i.e., flood control lots).

    The Hills Urban Overland Flowpath Mapping
    Read More
  • Fannie Road Bridge Upgrade +

    CSS were engaged as subconsultants by The Balmoral Group USA, to complete the hydrologic and hydraulic analysis for the proposed upgrade of the Fannie Road Bridge crossing of Big Escambia Creek in Escambia County, Florida. 

    Fannie Road Bridge Upgrade
    Read More
  • 1

CatchmentSIM is a powerful software package for hydrologic analysis of terrain including mapping catchments, flowpaths and integration with hydrologic models.
  • Create a DEM from a wide range of data sources.
  • Remove flat and pits from the DEM using advanced filling and breaching algorithms.
  • Map the drainage path for any point in the terrain.
  • Automatically delineate stream networks complete with Horton ordering and full range of hydrologic attributes.
  • Automatically breakup a catchment into a subcatchment network.
  • Automatic calculation of subcatchment impervious proportions.
  • Integrates with 12d to map drainage catchments for pits and other structures in urban environments.
  • Use bathymetry and lake data to develop stage – area – volume relationships for reservoirs and lakes.
  • Chart a wide range of hydrologic attributes of subcatchments.
  • Visualise your project with 3D OpenGL graphics.
  • Export to GoogleEarth for powerful presentations.
  • Seamless integration with any external software via a macro language. Buit-in scripts allow creation of files compatible with a wide range of software.


CatchmentSIM 3

Map flowpaths from any point in the terrain

Integrate with Google Earth

Read More

Storm Injector provides a powerful interface for implementing Australian Rainfall & Runoff 2016 design storms using a range of Australian hydrologic models including RORB, WBNM and XP-RAFTS. It offers charting and tools for analysing the results of the models to aid in selection of critical durations, flows and hydrographs for hydraulic modelling. Storm Injector is ideal for organisations that want to ensure a consistent approach to ARR 2016 across many hydrologic models such as Councils, developers and consultants.

Features include:

  • Automatic download of Data Hub and BoM IFD Information
  • Coordinate conversion to allow easy derivation of lat/long for data download
  • Download an unlimited number of IFD data-sets to allow spatial variation in rainfall depths
  • Calculate Areal Reduction Factors
  • Calculate initial losses including pre-burst adjustment
  • Create storms based on frequent, rare or normal IFD point temporal patterns, or Areal temporal patterns
  • Create ARR 1987 storms including depth area adjustment
  • Run all storm in your choice of hydrologic model in the background
  • Flexible custom events to assess climate change analysis and sensitivity to initial loss, rainfall increase, partial area effects and others
  • Analyse all results including selection of adopted temporal pattern for each duration and identification of critical duration
  • Create box plots and chart hydrographs for any storm
  • Statistical analysis tools to help inform selection of temporal patterns for hydraulic models
  • Integrate with TUFLOW via rainfall file export and ts1 format hydrograph export





Read More

TUFLOW Run Interface Manager (TRIM) is an application to help manage your TUFLOW model runs more efficiently.

  • Easily add any number of TUFLOW models to your queue.
  • Automatically run your models in sequence with any number of simultaneous runs (TUFLOW and TIRM license dependent)
  • Get Email or Skype messages when models finish
  • Add models and check status remotely via Skype
  • Simple progress bar and grid display allows rapid visualisation of model queue progress and model health
  • Easily test one or more models prior to running the entire queue.
  • Charts inflows, outflows and errors on the fly for each simulations.
  • Easy access to log files, key files and directories via right click menu.



TRIM Event Configuration


Read More

CatchmentSIM Update & FMA Presentation

We are pleased to announce a new release of CatchmentSIM that brings Kriging and Natural Neighbour Interpolation to the Rainfall Analyser module and the Interpolate Grid from Points tool. These methods offer improved interpolation for rainfall observations and most types of point data. Click the Read More link to see some examples of how significantly rainfall isohyets can vary based on the interpolation method.


We are also happy to release our paper and presentation from this year's Floodplain Management Authorities conference in Brisbane. The paper discusses how we tackled the problem of applying freeboards in areas of overland flooding. This is an important area of research considering the increasing focus on flood risk in urban catchments. Some further information is included in the Read More link.

Rainfall Analyser


CatchmentSIM Update

You may be surprised how much difference the interpolation method can make when interpolating data with relatively sparse observations (such as rainfall). The images below show the difference between the rainfall isohyets generated for a single timestep for a rainfall event using Inverse Distance, Kriging and Natural Neighbour interpolation. These differences flow through to your average weighted rainfall depth hyetographs for each subcatchment and will improve your spatial rainfall representation in your hydrologic model when modelling observed rainfall events.

Inverse Distance Weighted Interpolation (unrealistic - assumes gauges are local peaks or troughs)
Kriging Interpolation
Natural Neighbour Interpolation

2015 FMA Paper

Our FMA paper included development of a tool to derive vector flow paths from hydraulic model results (including TUFLOW). These allow linking of disconnected puddles after flood results are filtered and provide the basis for better interpolation of Flood Planning Levels and Areas.

Vector flow paths from hydraulic model linking flood risk 'puddles'
Extrapolated Flood Planning Level and Area based on vector flow paths
Cross section demonstrating the application of freeboard to overland flooding results



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