Formerly underground drainage
The Brenet is a lake in the canton of Vaud, in western Switzerland. It is located at the extreme northeast edge of the Vallée de Joux in the Vaud Jura, near the border with France.
The average altitude is 1002 m above sea level. M., and thus 2 m lower than that of the Lac de Joux, of which the Brenet is only separated by a 200 m wide land bridge. The lake is 1.5 km long, 500 m wide and up to 18 m deep. The Brenet is bounded on the northwest by the wooded heights of the Jura range Risoux, to the east by the height Les Agouillons and the Dent de Vaulion. The northern and eastern shores are steep, south-west is located on the banks of the lake a small swamp.
There are no major tributaries above ground, only an overflow from the Lac de Joux. Previously, the water flowed underground through seepage from hopper on the northwest shore and passed through a fracture system between the rocks to the source de l' Orbe. These funnels were but sealed with cement. The Brenet now serves as a storage pool of the plant Vallorbe, and the water is diverted through a tunnel under the Mont d' Orzeires and via a pressure line to the central Vallorbe.
The only place near the lake is Charbonnières that belongs to the political community Le Lieu. Along the eastern shore of the lake runs the branch line that connects with Vallorbe Le Brassus.
The Brenet is in contrast to the Lac de Joux not be walked in the winter. Because currents he freezes only partially, whereas the Lac de Joux is often completely frozen and can be crossed. The beauty of Brenet is of the lovely, romantic style, accompanied by the sculptural forms of the Dent de Vaulion.