The lake has drained 11 times since 2008 and experts predicted it will increase in frequency.

Slowly the lake drained leaving a large flat area filled with organic material.

This underground lake lay beneath the swamp and drained it.

The lake drained into the river a mile or so to the west.

But the lake eventually found an outlet through a system of caves and drained completely.

The lake drained away; the reason for which is the subject of ongoing debate among geologists.

However, the lake did not hold up long, and eventually drained into the Illinois River valley.

As the lake drained, this area slowly filled in with wetland plants and animals.

Before this the lake drained into the sea by numerous subterranean channels.

The higher lakes drain into the lower ones due to their step-like situation.