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Editing v0.31:Aquifer
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− | An '''aquifer''' is a subterranean layer of | + | An '''aquifer''' is a subterranean layer of {{l|water}}-bearing rock or {{l|soil}}. Attempts to mine through them will result in the mined-out squares immediately filling with {{l|water}}, effectively halting excavation at or below their level. This, in conjunction with the fact that they are often located in areas rich in {{l|loam}}, and {{l|sand}}, makes it difficult to find great quantities of {{l|stone}} in areas with aquifers, making for more challenging gameplay. |
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== Dealing with aquifers == | == Dealing with aquifers == | ||
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===The ore method=== | ===The ore method=== | ||
+ | On maps where the aquifer is not held in a layer of soil, but instead is held in a [[40d:sedimentary layer|sedimentary layer]] such as sandstone, it may be possible to tunnel down through deposits of ore such as magnetite. For this to work you have to find a spot where there is coincidentally an ore deposit on each Z-level you need to dig through. This is only possible through tiresome trial and error, or through the use of a utility like reveal.exe. | ||
− | + | ===The magma/obsidian method=== | |
+ | If you have access to a supply of magma, you can create your own obsidian caissons. By channeling into the aquifer layer and then filling these channels with magma, it is possible to create a wall of obsidian between your working area and the {{l|water}}-bearing rock or {{l|soil}}. However, changes to world generation with the last version have made this method more difficult than it once was, as it is now harder to find magma vents that extend above the aquifer level. | ||
===The cave-in method=== | ===The cave-in method=== | ||
+ | If there are enough layers above the aquifer, then letting non aquifer rock fall into the aquifer layer gives an area of dig-able rock. This requires 2N natural dry layers, where N is the number of consecutive aquifer layers. First {{l| 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 {{l| 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 {{l|hospital}} standing ready in case the unlucky one survives.) | ||
− | + | After the collapse, do not dig out the outer edge of the fallen rock. | |
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===The freezing method=== | ===The freezing method=== | ||
− | If you are playing in a freezing or very cold landscape, where it snows in winter and instantly freezes water | + | If you are playing in a freezing or very cold landscape, basically, where it snows in winter and instantly freezes water, you can dig out a 3x3 hole in the ground using channels, and make it deeper and deeper until you reach the aquifer level. Once you reach the damp rock, tunnel into it with an up/down staircase - the incoming water will freeze after a few moments. The central square of the 3x3 hole should be tunnelable ice, so you can get to the rock beneath. If there are two acquifer levels, for example, you can just make a larger initial hole, and make a smaller one for the level after. |
− | If your fortress is in a zone that gets warm, build walls around the inside of the hole to stop the water coming in once the ice melts | + | If your fortress is in a zone that gets warm, build walls around the inside of the hole to stop the water coming in once the ice melts. |
− | + | {{World}} | |
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− | + | [[Category:World]] | |
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