I realize your fortress is pretty much crumbling into pieces... but how'd you get through the aquifer, and how thick was it?
Two z levels. Since the map is frozen 10 out of 12 months of the year all i had to do was channel and the ramp made would instantly freeze into a block of ice when the water poured in. That's how my miners all died, they kept walking through the ramp to get back to the meeting zone as it filled and froze over. Not a good idea actually.
There are only two sane dwarves left, one head smith with his babbling naked lover (yay for him on the naked part?) and one soldier that fails to give two shits. the other four survivors were eaten by beak dogs.
Just pierce the aquifer through a more conventional means if you ever want to; dwarves simply can't comprehend the world around them yet and don't realize that water+freezing biome+dwarf in watery tile=harpy lick (like a salt lick except meatier)
Ah... I have the misfortune of having a 3-Z aquifer, and two of them are unsmoothable soil. I got through the first layer pretty easily but this introduced the problem that as you go down each Z you rapidly run out of space to operate pumps, cause each level shrinks your available space by 2 on the width and length... My map does Freeze, for about 20 days in the dead of winter, very narrow window to work with but that's probably going to be my last ditch effort.