Loess-loam-shaped lowland stream
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The loess-loam-shaped lowland stream is a type of flowing water specified by the LAWA . It occurs only in the loess regions and more rarely as a more clay-shaped brook in the area of the ground moraine .
Water structure
The loess-loam-shaped lowland streams are naturally the deepest flowing waters. They have steep banks that overhang on steep slopes , but are still stable. Erosion takes place almost exclusively on the river bed. The waters often meander or meander with a very steady current in a valley . The bottom of the river has only small proportions of organic material, marl and gravel banks in the ground moraines. Due to the material carried, the water often has a milky, cloudy color. Near-natural streams are very rare due to the intensive agricultural use of the extremely fertile loess areas.
Flora and fauna
The number of invertebrate species is low due to the large amount of sediments that are carried along. Certain caddis-fly larvae , mosquitoes and, in dry areas, mayflies are present . There are also only a few species of fish such as gudgeon or roach and chub in the somewhat larger waters . Small streams are partially populated exclusively by sticklebacks .
Due to the constant cloudiness of the water, there are hardly any aquatic plants, sometimes floating leaf plants such as the crested spawn are found. Plankton cannot be found either.
Examples
swell
- Profile of the river type 18 on wasserblick.net (PDF file; 174 kB)