How to find the aquifer in Dwarf Fortress

dwarf-fortress

In my map there are no rivers and the only water source I have is some small lakes. There supposed to be an aquifer but I haven't come across it yet. How can I find it or increase my chances of finding it?

Are they supposed fill the entire z-level? I have dug a vertical exploratory shaft 100 levels deep but still all I have found so far are stone and metal tiles. Am I supposed to also search for it horizontally? Wiki is not clear on this.

Best Answer

An aquifer is usually encountered only a few z-levels below the surface, I'd say 6 at most maybe, so if you haven't encountered it by then, it mean it's not there.

There's a possibility you've embarked on a location with two or more different biomes, only one of which holds an aquifer. So your best bet is to just make a lot of short vertical shafts all over your map, until you find it.