Body of water

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The water body is the section of a body of water .

Originally, the water body according to DIN 4049, Part 1 (1992) was a water volume [m³] that can be clearly defined or delimited . It was a conceptual construct that describes an imaginary body made of water that fills a certain cavity.

The water body is a central term of the EU directive 2000/60 / EG (so-called water framework directive ). The term is defined in Section 3 No. 6 of the Water Management Act and used there and in the Surface Waters Ordinance for the further implementation of Directive 2000/60 / EC.

According to the Water Framework Directive, a surface water body is understood to be a “uniform and significant section” of a body of water. According to the state ordinance, it is a uniform and significant section of a surface water, such as a lake, a storage basin, a flowing water, a river or a canal, a part of a flowing water, a river or a canal, a transitional water or a coastal stretch of water. Several small, very similar streams can also be combined into a single body of water. A groundwater body is a delimited volume of groundwater within one or more aquifers.

The two most important criteria according to which water bodies are defined are typification and water status. Water bodies should reflect the change in type and the change in condition in the water body. In addition, water bodies should enable management, i.e. the targeted action of the water management administration on the management objectives of the Water Framework Directive.

A body of water is to be separated from the body of water according to DIN 4049. A body of water comprises the water-filled space of a hollow shape, namely the body of water in the sense of DIN 4049, and also the hollow shape itself, i.e. the water bed made up of the sole and bank . In summary, the term water body can denote two things, a whole, the water section, or a part thereof, namely the water located in the water section. The distinction between the river bed and the body of water above it in terms of DIN 4049 is particularly important in water ecology.

Rivers usually change in their course: the upper course often has a different shape, different flow conditions and a different substrate than the middle or lower course. The differences are sometimes so great that the upper, middle and lower reaches of the river have to be assigned to different types of watercourses . By dividing the flowing water into several sections, i.e. water bodies, the sequence of types in the course of the water can be mapped. Standing waters can also be so strongly structured that different types of watercourse, i.e. water bodies, can be identified. This also applies to the coastal waters, which on the diverse Baltic Sea coast with its sounds, lagoons and harbors divide into very differently shaped sections, i.e. water bodies.

There is not only the division of larger bodies of water into several water bodies, but also the combination of several connected watercourses into one water body. This is particularly important for statistical information: The length of a body of water, which consists of a stream and several of its inlets, can be greater than the longest flow path in this system.

Individual evidence

  1. ↑ Example: Water body 20872 Erlbach (Weisse Elster), 38.8 km (PDF) , GKZ 56652, all flow paths under 23 km.

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