The reservoir ensures the drinking water supply for >250,000 inhabitants of the districts of Paderborn, Soest, Gütersloh and Warendorf, as well as flood protection for the region.
The test impoundment took place from April 1979 to June 1982 (FRANKE & FREY 1987). The lake is approximately 3 km long and has a maximum width of 1.5 km (WASSERVERBAND AABACH-TALSPERRE 2018). The total reservoir capacity is 20.5 million m³ and the water surface area is about 180 ha at full damming (FRANKE & FREY 1987). In addition to the main reservoir, the dam has a smaller fore-reservoir of similar design. This is about 430 m long and 130 m wide.
The Aabach flows into the reservoir of the pre-dam. The catchment area of the reservoir is 28 km².
A comparative study between different hypolimnial input systems showed that the Tibean is the most economical method and that it provides various additional options for water management compared to other input systems.
- Establishment of a controlled mass transfer by lateral volumetric flows and introduction of the controlled mixtures by opening the destratification flaps.
- Additional sediment treatment by adding binding agents to the degassing head.
- Keeping the water surface of the dam free of ice through winter operation while opening the destratification gates.
- Degassing of foreign gases from the mineral, as well as the foreign gases from microbiological degradation from the water, such as carbon, nitrogen, methane, etc.
- Optionally, the Tibean can also be equipped with a second oxygen gassing device to return the reflux water to the hypolimnion with up to 200 % excess oxygen, if required.
The successful installation took place in 2019.
