River basins (HAD)

Map 3.2 shows the above-ground river areas with an area of more than 500 km². The rivers are divided according to the number of rivers. Signatures for water sheaths classified. According to the classical river regulation concept the main river receives the atomic number 1 and the tributaries directly into it. Atomic number 2;the tributaries flowing into these tributaries the atomic number 3, etc. In accordance with this principle, the river areas are classified in map 3.2, with the six Electricity zones of Germany and the coastal areas of the North and Baltic Sea the atomic number 1 is assigned.