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[Thief^]

I was digging a shaft of alternating up/down stairs from deep to the surface, and dug a downstairs into the layer below an aquifier, causing a terrible flood. I sealed the area, saving the fort, but left the designation that was digging down from the surface there. After a little while, a dwarf dug an upstairs into the aquifier level itself from above. The upstairs square filled with water, as expected. What I didn't expect is that this carved upstairs is water-tight, as water isn't leaking out of the bottom of it into the square below, like it was before the tile was carved out.

To recap:
Downstairs below an aquifier: huge leak
Upstairs in the aquifier layer: leak stops

Is this expected?

[smjjames]

From what I have heard, I think this is normal aquifer behavior. Not having actual experience with aquifers though, I could be wrong on this.

Aquifers are known to have some strange behavior though, so.....

[eerr]

is the aquifer draining into another aquifer?

[Thief^]

is the aquifer draining into another aquifer?

No, water was coming out the bottom of the aquifer fine until I dug into the top of it.