Lake Davos ( Davos Lake outdated and written ) is located in the canton of Grisons, just North of the famous ski resort of Davos. It marks the north-eastern end of the town of Davos, a country traversed by the water valley that extends to the southwest to Zügenschlucht. North of the lake leads to the low Wolfgang pass over to Klosters in Prättigau. It is eponymous for the immediately overlying him Seehorn.
The lake is in the summer due to thermal winds a very wind for sailing and surfing lake. The water temperature reaches a maximum of 20 ° C.
The result of the lake is by a landslide of Totalp in Parsennarea, the pent-up until then flowed away towards Prättigau waters of today's top Country Water area. The water flowed over and not cut as in the case of Ruinaulta then the landslide, but could run off to the little lower opposite side of the valley and eats since continued in the rocks of the canyon trains. Lake Davos is the rest of this lake, which once covered the entire gradient low current high valley and was later filled by the bed load of Flüela Bach and Dischmabach substantially. On the other hand, the growing of alluvial creek Flüela increased gradually toward the elevation of the land Seeabflusses water, which was counteracted by the ongoing reduction in the area of the lake by sedimentation.
Lake Davos gets its water not only from the inflowing rivers such as the Totalpbach, but also on groundwater entrees from the alluvial fans of the Flüela creek. The former natural drainage, the lake water was regarded as the beginning of the country water, despite lower water levels over the Flüela Bach. By engineering measures for energy production, this situation is now greatly changed.
From time immemorial the lake contributed to the evening out of the runoff, resulting in low outflows winter months could be important. Until the 1920s, the lake of Davos was used all year round tourism and business. In the winter he was traveled by horse-drawn sleigh and also long been used for the production of ice that was transported in winter by rail to the rest of Switzerland.
Since the commissioning of the pressure tunnel to the power station monastery in 1922 the lake for the production of electricity is being used. In order to secure a uniform operating in outflow weak winter months a part of the underground Flüela Bach is derived in the lake. Nevertheless flows for power generation more water to Klosters from, as the surrounding creeks feed, so that in the cold season, the lake basin falls mostly dry and can not be used otherwise.
An initiative by local politicians who wanted to keep the water level even through the winter on a natural height, was rejected because of the associated losses in electricity generation from Davos voters.