eWater Toolkit

The eWater Toolkit – online access to water modelling tools

The one-stop-shop for water and catchment management utility tools backed by a community of practice.

Now with more than 10,000 users in over 120 countries, the Toolkit is a web-based distribution point for hydrological, ecological and catchment management models, databases and other resources useful to all involved in land and water management or related areas of R&D. Most of the tools are available as freeware. 

Join today to:

  • download eWater Toolkit tools
  • engage in discussion forums
  • seek support from tool-user communities
  • stay up-to-date with tool releases.

Subscription to the eWater Toolkit is free, and only takes a minute. Visit the Toolkit to get started:

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For sales, support and training enquiries phone 1300-5-WATER or email us.

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Urban tools



Aquacycle is a total urban water balance model gaming tool that estimates water demand, stormwater yield, wastewater yield, evaporation, imported water use, stormwater use, and wastewater use for a particular site. It provides a preliminary assessment of the performance of both conventional and innovative water system designs.


MELS (Minimum Energy Loss (MEL) Structures) is a hydraulic design and analysis suite that enables designers to quickly trial several alternative MEL culvert designs, checking for basic structure dimensions and performance under adverse conditions such as high or low flow and sedimentation issues.


CHUTE is a spreadsheet program for the design and analysis of rock chutes. Rock chutes can be employed in the restoration of rivers and channels to stabilise an erosion head or to reduce the overall grade of the channel.

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Eco tools


Eco Modeller

Do you need to know how a wetland will respond to watering in summer? Or if a fish population will benefit as much from flooding of a red gum forest as from addition of large woody debris to the river?

Eco Modeller can give you guidance—and confidence in your decisions.

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An understanding of cause and effect is central to decision-making in environmental management. It matters most where decisions may be subject to challenge or where restoration budgets are tight and managers are looking for the best value.

Eco Evidence software facilitates causal assessment for environmental management, and offers a mechanism to make best use of the extensive pool of published research.

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eFlow Predictor

Are you a manager of environmental water allocations? Do you need a quick way of deciding how to augment existing flows to meet environmental as well as human objectives?

eFlow Predictor – from eWater CRC – is a standalone software tool that is designed to help you; it calculates the amounts of water required to provide flows that meet a set of environmental needs.

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CHUTE is a spreadsheet program for the design and analysis of rock chutes. Rock chutes can be employed in the restoration of rivers and channels to stabilise an erosion head or to reduce the overall grade of the channel.


Concept is a conceptual diagram drawing package that can be used to communicate dynamic relationships between multiple elements.


MCAT (Multi Criteria Analysis Tool) is an investment decision support tool that optimises environmental expenditure using multi-criteria analysis and combinatorial optimisation techniques.


RAP (River Analysis Package) is a collection of 3 tools: Hydraulic Analysis - examines the hydraulic characteristics of river channels to determine the optimal discharge for a river reach based on specified rules. Time Series Analysis - calculates summary statistics of time series data, including hydrological metrics. Time Series Manager - manipulates and manages time series data.

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River tools



CHUTE is a spreadsheet program for the design and analysis of rock chutes. Rock chutes can be employed in the restoration of rivers and channels to stabilise an erosion head or to reduce the overall grade of the channel.


RIPRAP is a spreadsheet program for the design of rock lining (rip-rap) bank protection. It provides a range of rock sizes to be used depending on bank angle and depth chosen.


WRAM (Water Re-Allocation Model) simulates water allocation and trading between irrigation areas. Based on an economic optimisation model, it determines optimal water allocation and reallocation in terms of crop planting decisions and irrigation water requirements and simulates trading of water entitlements between irrigation areas, and generates water accounts for economic impact analysis.

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Catchment tools



BC2C (Biophysical Capacity to Change) is a tool for estimating catchment scale water and salt export quantities, following changes in landuse in upland catchments. Intended for use with regional data sets, it gives an indication of changes under different scenarios (e.g. change in percentage tree cover) that can be used to pin-point and prioritise areas for further investigation.


CatchmentSIM is a 3D-GIS topographic parameterisation and hydrologic analysis model. The model automatically delineates watershed and subcatchment boundaries, generalises geophysical parameters and provides in-depth analysis tools to examine and compare the hydrologic properties of subcatchments.


CMSS (Catchment Management Support System) predicts average annual loads of pollutants (usually Total Phosphorus and Total Nitrogen) at the sub-catchment level, according to different land use types.


FCFC (Forest Cover Flow Change model) is used to adjust daily time series observed or simulated flow records for significant changes in forest cover. It is applicable to small to medium unregulated catchments with major changes in the proportion of forest cover and can be used to adjust inputs to larger scale catchment models.


RRL (Rainfall-Runoff Library) simulates catchment runoff by using daily rainfall and evapotranspiration data. The models may be applied to catchments from 10 km2 to 10,000 km2 on a daily time step.


SCL (Stochastic Climate Library) is a source of models for generating climate data, including rainfall, evaporation or temperature, at multiple timescales, across single or multiple sites.


SedNet identifies sources and sinks of sediment and nutrients in river networks and predicts spatial patterns of erosion and sediment load. This tool can help target management actions to improve water quality and riverine habitat.


SHPA (Soil Hydrological Properties of Australia) is a collection of maps and GIS data that provide estimates of soil hydrologic properties across Australia based on the Atlas of Australian Soils and interpretations by Neil McKenzie.


NSFM (Non-parametric Seasonal Forecast Model) is a non-parametric seasonal forecasting model that forecasts continuous exceedance probabilities of streamflow (or any other hydroclimate variable). NSFM forecasts the exceedance probabilities of streamflow several months ahead by exploiting the lag relationship between streamflow and ENSO (El Nino/Southern Oscillation) and the serial correlation in streamflow.


IHACRES (Identification of unit Hydrographs And Component flows from Rainfall, Evaporation and Streamflow data) is a catchment-scale, rainfall-streamflow, modelling methodology that characterises the dynamic relationship between rainfall and streamflow, using rainfall and temperature (or potential evaporation) data, and predicts streamflow.


CLASS-CGM (Crop Growth Model) can be used to simulate growth of main C3 field crop types such as wheat, barley, canola, sunflowers and C4 field crop types such as maize and sorghum. CLASS-CGM can also be used to simulate crop growth impacts on water balance from CLASS-U3M-1D.


CLASS-PGM (Pasture Growth Model) can be used to simulate growth of composite pasture types of multiple perennial or annual pasture species and to simulate pasture growth impacts on water balance from CLASS-U3M-1D.


CLASS-SA (Spatial Analyst) is a spatial modelling tool that can be used to generate climate zones, multi-resolution DEMs, wetness index, lateral multiple flow paths, accumulation and dispersion of water and solutes from hazard areas, estimation of soil depth, soil material distribution and soil moisture storage capacity in different parts of the landscape.


CLASS-U3M-1D (Unsaturated Moisture Movement Model) can be used for estimating recharge, plant water use and soil evaporation across the soil profile at daily time steps using the Richards' equation.

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Toolkit info

The Toolkit lets people working in water and catchment management to trial and adopt decision and analysis tools, backed by a library of technical information. Become a Toolkit member to be part of best-practice thinking, find a repertoire of resources, and share experiences, tools, and fresh ways of addressing recurring problems.

The Toolkit contains the popular tools RAP, RRL, Aquacycle, CLASS and SedNet as well as information on TIME (the invisible modelling environment), a code-base and algorithm library.

The tools help predict the multiple impacts of land and water management decisions across an entire catchment. They are designed for analysis of catchments, rivers, terrain, ecological response, urban water, vegetation, water quality and quantity and water trading. These tools have been developed by eWater and its forerunner CRC over many years.

With its protocols and underlying philosophy of supporting users, the Toolkit has become more than a collection of software. Not only does it put water and catchment research directly into the hands of the water management industry and researchers, it has also generated a community of practice in catchment and water management and research.

It now also offers resources on five themes: urban water, river management, ecology and restoration, catchment modelling, monitoring and assessment. Resources include documents and weblinks. Throughout its life online to date, including several iterations, the eWater Toolkit has proved to be unlike anything else in the water management field.

The eWater Toolkit currently contains software, databases and information resources concerned with hydrology, catchment management, and freshwater ecology, in urban and rural environments. In total, the Toolkit delivers around 24 software tools that are freely available.