![]() ![]() HydroBASINS only includes a limited amount of (mostly geometric) attribute information, such as the sub-basin area, the distance from upstream headwaters and ocean outlet, and the Pfafstetter coding. To support these functionalities and topological concepts, the ‘Pfafstetter’ coding system has been implemented in the HydroBASINS product offering 12 hierarchically nested sub-basin breakdowns globally.Īt its highest level of sub-basin breakdown, HydroBASINS encompasses 1.0 million individual sub-basin polygons with an average area of 130.6 km², representing a total of 135.0 million km² of global land area (excluding Antarctica). A second critical feature of sub-basin delineations is the way the sub-basins are grouped or coded to allow for the creation of nested sub-basins at different scales, or to navigate within the sub-basin network from up- to downstream. ![]() At its highest level of sub-basin breakdown, HydroBASINS divides a basin into two sub-basins at every location where two river branches meet which each have an individual upstream area of at least 100 km². the decision of when and how to subdivide a larger basin into multiple tributary basins. ![]() Depiction of nested sub-basin delineationsĪn important characteristic of any sub-basin delineation is the sub-basin breakdown, i.e. ![]()
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