The water in the lake can have a floating level much above the level of the ground threshold.
2.
The floating level can be thought of as the water level in a hole drilled through the ice into the lake.
3.
If the hydrostatic seal is penetrated when the floating level is high, the water will start flowing out in a j�kulhlaup.
4.
For the lake to exist there must be a hydrostatic seal along the entire perimeter, if the floating level is higher than the threshold.
5.
In Lake Vostok the ice rim has been estimated to a mere 7 m, while the floating level is about 3 km above the lake ceiling.
6.
Since j�kulhlaups emerge from hydrostatically-sealed lakes with floating levels far above the threshold, their peak last ice age ( e . g ., Lake Agassiz and the English Channel ), and presumably at earlier times, although the geological record is not well preserved.
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