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No. 35744
If there are enough layers above the aquifer, then letting non aquifer rock fall into the aquifer layer gives an area of diggable rock. This requires at least 2 natural dry layers. If multiple aquifer layers are to be breached, things get more complicated. First channel out the area of aquifer that will be replaced. Then dig out all connecting floors and walls to the block that will fall (build a support to hold it until you are ready for collision). A burrow may be useful to assign unnecessary dwarves to a safe area. When everyone is clear, de-construct the support with a lever. (If you forgot to bring stone, then you may instead build a constructed floor to support it, designate it to be destroyed, and have a hospital standing ready in case the unlucky one survives.)
After the collapse, do not dig out the outer edge of the fallen rock.
This does not work with wood walls since they deconstruct on cave-in.
If you build many rings inside one another in your top drop layer, you can breach multi-level aquifers with as little as 2 natural layers of dry soil above it. Drop the rings from the outside to the inside using constructed arms to hold the center rings in place. Once a ring drops into the water below it, pump out the water in the center and dig down another layer. When that is complete, drop the next ring and continue the process until you are through. Since you start dropping rings from the outside it is necessary to know how many levels deep the aquifer is before you begin.
Some might regard this method as cheating, so use it at your own risk.
Note: There is a bug that may prevent this method from working, collapsed layers may turn into the aquifer layer type that was dug out at that level. So, for example: We have three layers, layer 1 has the caving in section, and is not an aquifer. Layer 2 is a dug out layer that is also not a aquifer. And Layer 3 which is dug out and is an aquifer. Now, the bug, say layer 1's cave-in section lands on layer 3's dug out area, sometimes layer 1's caved in section may change into layer 3's soil type. Making it an aquifer too. Thus making the cave-in method impossible for that area.
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