Hydrological Atlas of Switzerland – Plate 1.2
For the Atlas, a spatial system of catchments comprising three levels was developed thus allowing a direct comparison of catchments within one level, and a linking one below the other of the catchments in all three levels by means of aggregation or disaggregation. Large catchments (river basins) usually covering an area of multiple 1000 km² are the top level. The water balance basins including catchments of 100 to 150 km², are a result of subdividing the river basins. The small catchments (30 to 50 km²) make up the lowest level of the spatial system.
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