Free GIS Data -Hydrology Data
- HydroSHEDS: Hydrological data and maps based on the STRM elevation data. Includes river networks, watershed boundaries, drainage directions and flow accumulations for the globe.
- Catchment Characterisation and Modelling: Data on river basins, catchments and rivers for the European Union area.
- Major Watersheds of the World Deliniation: Vector data showing the outlines of major watersheds (river basins) across the world.
- Water Isotopes: Global grids of hydrogen and oxygen isotope composition of precipitation and environmental waters in ArcGRID format. Data can be downloaded for whole globe or individual continents.