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[cyclotis04]

I've found an excellent way to tunnel through two layers of aquifer with collapsed caverns. Is this a bug or a feature? I haven't seen anything listing this as a valid method for burrowing through two layer aquifers, but it seems to work for me. This seems much simpler than the method described here: http://www.bay12games.com/forum/index.php?topic=31651.0

My method:

Starting from the top left, moving chronologically to the right, and vertically downwards.

Spoiler (click to show/hide)

(I think the picture is pretty self-explanatory, but ask if you have questions.)

[Jim Groovester]

Uhh, it's not that clear.

Could you provide some more explanation? From the looks of it, you penetrated two layers of aquifer with one chunk of soil, but I'm not entirely certain how.

[cyclotis04]

I dropped a chunk of earth (floor, layer, floor) into a channeled out square of aquifer, penetrating it, and the layer beneath it. A single 5x5 chunk dropped into a 5x5 channel plugged a 5x5 area of the first aquifer, and a 7x7 area of the second aquifer. I'm not sure how better to explain it than with the picture... What is it that you don't get? (Besides the physics of it - that's why I'm asking.)

[Jim Groovester]

I see what's going on.

I think you only penetrated a single layer aquifer, but it's easy to see why you might think there are two.

Aquifers leak on their own level, and they leak onto the level below them, thus giving the appearance of two damp layers. This explains why that single 5x5 chunk of soil plugged the aquifer and thus prevented any leaking onto the level below.

[cyclotis04]

Then why does the red clay flood when I dig it out? (Very bottom right picture.) Also, when I ramp up into the red clay, from the layer below, it begins to flood, even in an area untouched from the collapse. Do I just not understand aquifers? Does a single aquifer create two layers that I can't dig in?

[Jim Groovester]

Aquifers leak into the level below them. So yes, it basically does create two layers you can't dig in.

It's something annoying about them you have to keep in mind.

[Albedo]

(bah - ninja'd!) 

Yes, you just do not understand aquifers.  (But it seems you're close to doing so...)

JG answered that...

and they leak onto the level below them, thus giving the appearance of two damp layers.

A one-level aquifer has water on TWO levels - the level it's on, and the level below that.  But, if you can seal that one level (as you have done), it's fixed.

[cyclotis04]

Huh. That's unfortunate. I thought for sure that I'd dug right below an aquifer before. I thought I understood them better. *shrugs* Sorry for the false alarm.