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« on: March 03, 2011, 12:39:36 am »
Well I do have a few tips for determining how many aquifer layers you have. You might find them useful, so here they are.
The soil readout: Little Soil, Some Soil, Deep Soil, Very Deep Soil; as far as I can tell corrosponds to how many soil layers there are. 1 2 3 and 4 respectively. Soil aquifers will only appear in places with 3 or 4 soil layers. If you have a little soil or some soil embark and it reads aquifer, you have a conglomerate or sandstone aquifer waiting for you, and stone layer aquifers are almost always multiple z-levels in size.
If you have deep or very deep, it's not as easy to tell what you are gonna have. But if the readout says clay instead of shallow clay, you have a chance at it being a single layer aquifer provided the clay layer is in layer 3 or 4, since most clay layer types can't support aquifers.
Thats pretty much all the tips I have for telling what you have at the embark screen. My next one is for when you have embarked.
So look at all the pebbles around on your embark, are they conglomerate or sandstone? If so, guess what, you have one of them as an aquifer. If the pebbles are anything else, you only have soil aquifers. And if you combine that with knowlege you gleaned pre-embark, you can plan accordingly for your aquifer situation.
One other caveat, sand deserts still seem to give me false positives sometimes. So keep that in mind when embarking on those.
Edit: Grammar corrections