• 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

Finding New High Ground in Emergency Response Planning Classification

Recently, we've been undertaking some interesting research on applying Emergency Response Planning (ERP) classifications at much finer scales than previously possible. This has been achieved by the use of automated analysis using an adaptive road network algorithm that senses when a road becomes impassible in a flood and searches for an alternative route. CSS Principal, David Tetley presented this work at the 2014 Floodplain Management Authorities conference in Deniliquin and received a Highly Commended Paper award.

Click here to read the paper and/or view the presentation. If you're too busy, click Read More below for a brief summary.

Rainfall Analyser


The software we have developed to automate the ERP classification takes results from a flood hydraulic model (such as TUFLOW) and overlays that with a detailed DEM, a carefully prepared road network and a GIS file of the Precincts for which you wish to report Emergency Response Planning (ERP) classifications. We have successfully used this approach to classify ERP classifications down to individual household lots. The software exports ERP classifications for each precinct as well as a range of other interesting information including road inundation times and durations, evacuation distances and routes for vehicle, walking and rising road options, mapping of low flood island and other high risk areas.

As an example from the adaptive road network algorithm, the first 3 figures to the right present 3 different potential evacuation routes for the same property calculated at different times during the flood.

 This information is automatically combined with the Office of Environment and Heritage's guideline (Flood Emergency Response Planning Classification Of Communities) to produce ERP classifications for each precinct. The fourth figure presents a sample of results from the software showing the ERP classification as well as complimentary information concerning expected road cutoffs and depths.

During our research we also developed a potential alternative ERP classification schema that presents ERP risk on a gradient of 13 categories of increasing risk. We believe this method has significant potential, particularly when applied at small scales. Specifically, it's easier to understand and less tied to a specific hypothetical flood. Please refer to our paper for more information. The fifth figure to the right illustrates a sample of the ERP gradient results.




Vehicular evacuation route 0 hours after rainfall commences (1% AEP Flood)
Vehicular evacuation route 2 hours after rainfall commences (1% AEP Flood)
Vehicular evacuation route 8 hours after rainfall commences (1% AEP Flood)
Sample ERP Classifications at Lot Scale




Search Our Site