The backwater of the Schwalm through a weir plant as at the Lüttelforster mill is 1.5 to 2 meters and represents an insurmountable obstacle for the swimming in the water against the direction of flow.
The fish ladders at the Schwalm are designed as bypass streams that bypass the weir as a bypass. The flow rate is such that it is sufficiently large to produce a guide flow at the point of entry into the main body of water that is perceived by the fish and shows them the way. In the approx. 100 m long bypass channel, deep pools provide quiet zones for the upstream floating fish.Source: Extract from the information on the display board "Fischaufstiegsanlage an der Lüttelforster Mühle"
June 14, 2018
Since the 13th century, hydropower has been used in the 56 kilometer tributary of the Schwalm. By the end of the 19th century, 25 mills had sprung up in the German part of the river - about every two kilometers one. Weirs were built, some of them were peat oak. The weir at the Lüttelforster mill is 1.90 meters high and thus insurmountable for every fish.In other areas of the Schwalm, Schwalmverband and Land have already taken a lot of money into their hands to find their way back to nature. The best known example is the Dilborner Benden in Brüggen. But also the Brüggen and the Borner mill already have the solution for the fish: fish ladders they are called casual, fish ascent systems in technical German.
Next to the Lüttelforster mill, a small stream with several ponds meanders upwards. Again, the fish have to swim against the current, but in the deeper areas, they can rest up before each step.The Lüttelforster mill is the penultimate Schwalm mill, which now receives such a rise facility. The last missing one is the Mühlrath mill.Then finally the way is clear from the Atlantic to the upper reaches of the Schwalm. In any case, eels would have to swim 5000 kilometers from the small rivers to the Sargasso Sea and then return afterwards to be able to multiply.
October 15, 2018
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