Coarse material rich, carbonate low mountain range
The coarse material-rich, carbonate low mountain range (type 7) is one of the types of flowing water specified by LAWA .
Water structure
The bottom of these waters consists mainly of stones or gravel, finer materials such as sand only occur in small amounts in quieter places. Sometimes sintering occurs . The waters run stretched to strongly curved in different valley shapes . An only temporary water flow occurs relatively often, especially in karst areas, as does strong discharge fluctuations and seepage distances . Organic material such as fallen leaves can then also accumulate in the dry river bed.
Coarse material rich, carbonate low mountain range streams are the calcareous variant of the coarse material rich, silicate low mountain range brooks and therefore occur in limestone or chalk areas. In contrast to the carbonate low mountain range rivers, they have a catchment area of less than 100 km².
Flora and fauna
In the permanently water-bearing stretches of water, many species of lime- and current-loving invertebrates often occur side by side in large numbers, such as certain stoneflies , caddis-fly larvae and black flies . The fish, too, tend to love currents, such as brown trout , bullhead or minnow . In the temporary streams there are often no or hardly any fish and only a few invertebrates.
Aquatic plants usually only contain water mosses such as spring moss .
Examples
swell
- Profile of the river type 7 on wasserblick.net (PDF file; 167 kB)