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[timoch]

It's not the first time I pierce a multilayer aquifer. It seems it is the first time a lower level aquifer does not drain the upper layer.

In this specific instance, I could drain the first layer into the second but not the second into the third.
The layers are like this :

clay
sand
schist

The only difference I see is that the third is a rock aquifer while the first 2 are soil aquifer.
Could it be that soil aquifer produce more water than rock aquifers can drain ?

This is the second time I have the exact same issue.
I can of course just seal the 2nd layer as though it's the last and keep going but I am wondering why.

Thanks,

[Merendel]

And your sure the aquifer continues on the next Zlvl down, still in schist?   Honestly my first thought was you had reached the last level of the aquifer and didnt realize it in the sand.   Are you positive that your first rock layer is actualy an aquifer?   Is it actualy producing water or does it only have the damp stone designation due to the level above?.

If there are further aquifers below that level the only even remotely plausable option I can come up with is you might have 2 seperate aquifers stacked 1 Z lvl appart.   AKA 2 levels of soil aquifer, a level of stone under that caping a second stone based aquifer.   Then agian I dont even know if aquifers can spawn that way, I've seen varrying shapes but never this particular senario.   I've never had the double slit method fail me asside from that one time I found out I was trying to pierce the aquifer right on the edge of the aquifer and there was 1 tile I couldnt drain into.   That time I just abandoned the old slit and drilled down through the non aquifer after a double facepalm coupled with a few head on desk moments.

[timoch]

I was surprised the drain didn't work so I checked with DFHack's reveal.
I have 3 aquifer levels 2 soil and 1 stone.

What surprises me is that I've used the double slit methods a few times already and did not encounter any similar issue.

After checking again, I noticed, my schist layer is damp only under the sand layer (eg, some small area on the sand layer is schist as well, under those schist tiles the rock is not wet)
Is it possible the sand aquifer tiles dampen the schist tiles directly below them even without mining them to get the water out ?

[WanderingKid]

Schist can't be an aquifer.  Only soil layers are aquifers.

After checking again, I noticed, my schist layer is damp only under the sand layer (eg, some small area on the sand layer is schist as well, under those schist tiles the rock is not wet)
Is it possible the sand aquifer tiles dampen the schist tiles directly below them even without mining them to get the water out ?

Yes, that is exactly what's happening.  Aquifers will drain down as well as across.

[Merendel]

ahh from what your discribing the schist is not an aquifer, only the sand/clay layers.   From my experiments with DFhack Reveal the layer directly below the final aquifer shows up as damp.   It wont actualy produce water although if you dig under the non sealed aquifer you'll still get water from above.   Either way the schist is the layer under the aquifer, seal off the layer above as normal, dig down an extra layer to avoid accidents with leaky ceilings and start building.

Schist can't be an aquifer.  Only soil layers are aquifers.

there are several sedimentry stones that can support an aquifer such as sandstone.  I just tend to forget which stones are on that list if I dont look it up.

[AutomataKittay]

Is it possible the sand aquifer tiles dampen the schist tiles directly below them even without mining them to get the water out ?

Yes, always remember that floodable z's one z deeper than actual water producting layers if you don't want to accidentally mine your way into drowning. I don't think it'll absorb water, though.

[timoch]

Ok, I misread what reveal shows. Basically, reveal shows as damp any tile where water would flow into.
So the last layer marked as damp is actually not an aquifer but would flood if dug.

I wonder how I did not notice this during previous aquifer piercing. I probably used the standard (non-cheating) method of identifying the last aquifer level.

Thanks

[0ink3r]

Just gonna necro this thread to add that you can use the '/' command whilst paused to step yourself when piercing through to the next layer. This enables you to catch the tile you are revealing below prior to it getting the 'damp' status (which will happen only seconds after piercing when the water from the layer above falls into it)

[taptap]

Just gonna necro this thread to add that you can use the '/' command whilst paused to step yourself when piercing through to the next layer. This enables you to catch the tile you are revealing below prior to it getting the 'damp' status (which will happen only seconds after piercing when the water from the layer above falls into it)

Or you could just "know" (or look up) whether the stone in the next layer can possibly contain an aquifer or not. Only very few stones can - so it isn't that hard to remember these.

[0ink3r]

All depends on your embark, silly to chew your way through more 'suspect' layers than you actually need to.

The name of the mineral layer you find beneath does not necessarily dictate that the aquifer you have just penetrated will be present in it.

[PatrikLundell]

@0ink3r: If you were to apply logic, which is fraught with peril when DF is concerned, a layer capable of being an aquifer should always be one if located immediately beneath another aquifer layer, as it would flood from above, so it ought not be possible to e.g. have a non aquifer sand layer immediately beneath any aquifer layer of the same or some other material. Hm, if you were to carry that logic further water should also always drain into e.g. sand to either flow off the map or to gradually fill up until saturated, which doesn't happen...

[DeCervantes]

This is my first time trying to get through an aquifer and this has happened to me. Anyone else encountered this problem? What did you do?

[Mostali]

The gist of this thread is that the last layer isn't actually aquifer at all, it's just "damp stone".  What material is your last layer?

[DeCervantes]

I experienced this too. What happens is that the second layer is not an aquifer and thus does not drain. Just secure the aquifer layer and wait for the water to evaporate.