This layer was converted to a shapefile from a Esri File Geodatabase from Open Canada Portal, https://open.canada.ca/data/en/dataset/c20d97e7-60d8-4df8-8611-4d499a796493 .

The “Incremental Gross Drainage Areas of the AAFC Watersheds Project - 2013” dataset is a geospatial data layer containing polygon features representing the incremental gross drainage areas of the Agriculture and Agri-Food Canada (AAFC) Watersheds Project. The Project area is subdivided by hydrometric gauging station. The maximum area that could contribute runoff to each station, less that of its upstream neighbour(s) is called an ‘incremental gross drainage area’.

• Drainage
• Hydrology
• Inland waters
• Water
• Watersheds
• Western provinces

Open Government Licence - Canada (https://open.canada.ca/en/open-government-licence-canada)

Originally, the Project was to generate a drainage area database intended to provide the basis for updating regional flood and runoff studies. The database was available to all potential users. Over the years many geospatial data layers have evolved. The dataset provides delineations of ‘incremental gross drainage areas’ for hydrologic analyses and creating maps for watershed management projects for most of Western Canada.

Source: https://open.canada.ca/data/en/dataset/c20d97e7-60d8-4df8-8611-4d499a796493