Welcome to the CANadian Watershed Evaluation Tool (CANWET™ - Version 4.2)


CANWETTM (v 4.2) is a GIS-based software suite designed to inform decision making around river basin and watershed management; water supply and wastewater treatment infrastructure; food security; and, climate change adaptation. Its ability to quickly estimate daily water balance, nutrient, erosion sediment, and bacteria loadings from GIS input data allows CANWETTM to serve as a powerful decision support system. 

This latest release of CANWETTM is VB.Net database-driven and web-aware, and features an integrated open source GIS environment. Its relative ease of use and ability to take advantage of commonly available spatial data makes it a solid choice over other continuous models with greater data input requirements. This "All-In-One" software suite allows you to begin your project without requiring expensive prerequisite software to use in tandem.

Since 2003, CANWETTM has been used for Assimilative Capacity Studies; Watershed and Sub-watershed Studies; Master Drainage Plans; Infrastructure Planning; and, Source Water Protection Studies. Various versions of the GWLF engine that is incorporated into CANWETTM have also been applied in numerous studies worldwide.



CANWETTM (v 4.2) offers an extensive range of features and useful tools including:

  • Daily time-step simulation engine for hydrology, hydraulics and water quality.
  • Integrated and flexible charting and mapping of simulated output.
  • Comprehensive Beneficial Management Practice (BMP) routines.
  • Integrated hydraulic routing of in-stream water quality concentrations and flows.
  • Integrated climate change scenario analysis tools (including climate data).
  • Powerful web-based service for retrieval of useful datasets.
  • Modules to handle loading estimates from septic system and livestock contributions.
  • Routing of point source discharges.
  • Link simulated output back to GIS for map creation.
  • Resources to transform your CANWETTM GIS layers into Google Earth overlays.
  • Detailed Users' Guide and Technical Manual.

GIS Processing

CANWETTM allows the user to quickly and easily generate input data through Geographic Information System (GIS) clipping routines. Data is clipped from GIS vector and grid maps. The clipping routines are used to generate input data for single or multiple basin analyses.

GWLF Simulation Engine

The Generalized Watershed Loading Function (GWLF) is a continuous model based on land use categories. It simulates stream flow, sediment, nutrient (nitrogen and phosphorous), and fecal coliform loadings from catchments, given variable-size source areas (i.e. agricultural, natural, and urban/developed lands).

BMP Functionality

CANWETTM allows for the addition of beneficial management practices (BMPs) by applying area-weighted loading rate reductions for phosphorous, nitrogen, sediment, and animal coliforms for both rural and urban lands. Multiple practices can be added in parallel or in series. It also calculates estimated costs for typical BMP applications based on unit-costing.


CANWETTM features several powerful output approaches to suit your needs.


  • Multiple data series can be plotted simultaneously with dual axes.
  • Choose from Catchment output, Land use, Stream Routing, and Nutrient Routing dataset categories.
  • Charts can be custom labelled, formatted, and printed.


  • Grid data can exported in raw format to CSV format and imported to EXCEL for custom analysis.
  • Catchment output can be filtered by date, climate scenario, or theme (e.g. Hydrology, Nutrient Load Contributors, Sediment, Land Use etc.).


CANWETTM calculates continuous constituent concentrations by reach for use in TMDL and assimilative capacity studies.



Check this location for future training sessions by Greenland International Consulting Ltd.

Head Office for The Greenland Group

120 Hume Street
Collingwood, ON
Canada  L9Y 1V5

tel:  705.444.8805
fax: 705.444.5482
email: greenland@grnland.com


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Client Testimonials

Township of Adjala-Tosorontio

As Chief Administrative Officer for the Township of Adjala-Tosorontio, I would like to commend Greenland on their successful completion of the Everett Secondary Plan Master Servicing Plan and Class Environmental Assessment.
The level of service and timely delivery of all reports, analyses and correspondence was greatly appreciated by Township staff. Greenland’s innovative solutions and prompt responses to issues raised by the Town Staff Approvals Agencies and the affected public throughout the EA Process were very important, and we look forward to working with your team on future projects.

To that end, our team at the Township of Adjala-Tosorontio would be pleased to provide references for your firm on similar projects in future

Eric Wargel
Chief Administrative Officer
The Corporation of the Township of Adjala-Tosorontio

April 16, 2013

Town of Innisfil

I would like to congratulate Greenland Consulting Engineers on winning the 2012 Consulting Engineers of Ontario Environment Award of Excellence. The award recognizes your work on the Nottawasaga Pines Secondary School construction project with the Simcoe Country District School Board. This is a well deserved honour and is a reflection of both the caliber of your work and your team.

I continue to be impressed with your company’s commitment and innovation in the field of sustainable development. You have set an excellent example for others throughout Simcoe County  and the Province of Ontario.

John Skorobohacz
Chief Administrative Officer
The Corporation of the Town of Innisfil

May 1, 2012

City of Toronto

Mayor David Miller and Members of Toronto City Council extend appreciation to Greenland Group of Companies for your outstanding contribution to the City of Toronto’s Green Roof Technical Advisory Group. As a participant of the City of Toronto’s Green Roof Technical Advisory Board, you have contributed tremendously to its leadership role on climate change and helped support the development of the Toronto Green Roof By-law.

This initiative, the first of its kind in North America, sets the standard in designing sites and buildings across the city that are more environmentally friendly, a key strategy in reducing the effects of climate change.
We thank you for helping our city achieve its vision and goals on climate change – it is this kind of collaboration that makes us proud, prosperous and successful.

Best wishes for continued success.

David Miller
City of Toronto

May 2010

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