Gravel-shaped lowland stream
The gravel-shaped lowland stream (type 16) is a flowing water type defined by the federal / state working group on water .
In North Rhine-Westphalia it was formerly referred to as the “gravel-shaped flowing water of the weathered areas and river terraces”
Water structure
Gravel -shaped lowland streams are similar to the gravel-shaped lowland rivers , but their catchment area is smaller than 100 km². They are mostly steep, fast-flowing streams that are repeatedly interrupted by short, calm sections. In contrast to sand- shaped streams, they are only slightly curved or meandering and have less pronounced impact slopes, but in some cases they are deeply underwashed by the banks. The bottom consists mainly of gravel and different proportions of stones and clay as well as stones. Boulders are often found in the moraine area . Gravel-shaped lowland brooks mostly flow in curb, hollow or bottom valleys. The type of water is reminiscent of low mountain streams in sections.
Flora and fauna
There are mainly flow-loving species that can colonize the prevailing hard substrates (gravel, stones). These are different species of caddis flies and mayflies, as well as small fish such as loach and minnow .
Even with the aquatic plants, there are only those species that can deal with the gravelly subsoil, such as red algae and spring moss . In the young moraine area , the aquatic plants are usually completely absent, and plankton are also absent.
Examples
- Parts of the Wümme , Panke and Oertze
- Upper course of the linden tree (MV)
swell
- Profile of the river type 16 on wasserblick.net (PDF; 183 kB), accessed on November 17, 2011
Individual evidence
- ↑ State Environment Agency North Rhine-Westphalia (publisher): Guiding principles for small to medium-sized rivers in North Rhine-Westphalia. LUA leaflet no. 17. PDF ( Memento of the original dated April 2, 2015 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ^ Ministry for the Environment and Nature Conservation, Agriculture and Consumer Protection of the State of North Rhine-Westphalia (publisher): Guideline for the development of near-natural flowing waters in North Rhine-Westphalia, expansion and maintenance ("Blue Guideline"). Düsseldorf, 2010. Tab. 1 on p. 12.
