This lake falls completely dry in autumn and remains empty until being filled by growing underground flows depending on temperatures and snow melt rate in the mountains.

As soon as the basin is finally filled, a small river of just about half a mile in length (falling some 100 meters in level) will start flowing around May.

Its destination is another lake, Lag Tuleritg, which is fed by this river in spring, disappearing in autumn and staying dry all winter.

Due to its origin the water of both lakes remains grey all summer until the level starts to go down in autumn.

Because its proximity it is very likely that the water from Lag Tuleritg continues underground to Caumasee, although no experiments using colour was ever to prove this.