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[[File:Double-slit-name.png‎|frame|right|The two name-giving slits are highlighted]]
 
[[File:Double-slit-name.png‎|frame|right|The two name-giving slits are highlighted]]
  
QuantumMenace has developed a very easy method how to dig through an [[DF2012:Aquifer|aquifer]] of an unknown depth commonly known as the '''double-slit method'''. Its name derives from two channeled-out slits at the sides of a 2×2 area.
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QuantumMenace has developed a very easy method how to dig through an [[DF2012:Aquifer|aquifer]] of an unknown depth commonly known as the '''double-slit method'''. Its name derives from two channeled-out slits around a 2×2 staircase.
  
The slits are used to break into the aquifer layer below, hence their ramps are flooded (blue). Water can be pumped from one slit to another slightly faster than the aquifer is flooding it. While a dwarf operates the pump, another dwarf can access the source slit via the ramp and seal off the surrounding walls of the aquifer one by one.
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The slits are used to break into the aquifer layer below, hence their ramps are flooded (blue). During the process of securing the aquifer layer, water is being pumped from one slit to another. The [[screw pump can]] pump the water from one slit to another slightly faster than the aquifer floods it. This enables the dwarves to use the ramp of the slit to access the aquifer layer, mine one or two tiles of it and build walls which would seal off the aquifer.
  
== Draining an aquifer ==
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== General concept ==
  
Before we will have a look at the double-slit method itself, it is good to know these basic things about the aquifers and how to drain them.
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Aquifers produce infinite amounts of water, but they can also absorb infinite amounts of it. This makes it possible to pump out the water from one slit to the level above the aquifer and let it fall back down and become absorbed by the same aquifer layer again.
  
Aquifers produce infinite amounts of water, but they can also absorb infinite amounts of it. We can drain an aquifer into itself either within one z-level or across multiple z-levels.
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{|class="wikitable1" style="padding-top: 2em"
 
 
=== Draining across multiple z-levels ===
 
 
 
QuantumMenace's double slit method uses this kind of aquifer draining for all but the lowest aquifer level. Once one of the lower aquifer levels has been cracked open, it can absorb all of the water being produced by the aquifer level above it.
 
 
 
{|class="wikitable1"
 
 
|-valign="top"  
 
|-valign="top"  
| [[Image:Aquifer draining.png|left|350px|]]
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| [[Image:Aquifer_pump_scheme.png|left|600px|Water flow between the two slits.]]
 
|}
 
|}
  
=== Drain within one z-level ===
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We deconstruct half of the stairs to place a pump there. While a dwarf operates the pump, another dwarf can access the source slit via the ramp and seal off the surrounding walls of the aquifer one by one.
  
The double-slit method uses this for the lowest aquifer level. Here we pump out the water from a tile being flooded by the aquifer to the level above it (which is already secured) and let it flow back down to another tile where it becomes absorbed by the same aquifer layer again. Note that the target tile of the aquifer must be cracked open (e.g. by downstairs or a channel) to be able to receive water.
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{|class="wikitable1"
 
 
{|class="wikitable1" style="padding-top: 2em"
 
 
|-valign="top"  
 
|-valign="top"  
| [[Image:Aquifer_pump_scheme.png|left|600px|Water flow between the two slits.]]
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| [[Image:Half_stair_half_pump.png|frame|left|Pump set up at the level directly above the aquifer.]]
 
|}
 
|}
  
 
== Tutorial embark setup ==
 
== Tutorial embark setup ==
The double-slit method will be presented in a form of a play-along tutorial. Train it on an embark which you don't intend to play after you've made it through the aquifer. Try to embark at some forested place near the ocean where multi-level aquifers are almost guaranteed. Take this embark setup:
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Even in this newbie-friendly tutorial it won't harm if you first train this on an embark which you don't intend to play after you've made it through the aquifer. Therefore I suggest you take this embark setup:
  
 
* 1 Proficient Miner
 
* 1 Proficient Miner
* 4 Proficient Carpenters
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* 4 Proficient Masons
* 2 Proficient Wood cutter
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* 1 Proficient Carpenter
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* 1 Proficient Woodcutter
  
You can sell the anvil, one pick, and all quivers, splints and crutches to buy loads of wooden logs. It will save you time cutting down trees.
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sell the anvil to buy:
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* 30+ stones (you will need 16 pieces of building material per aquifer level)
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* 4 logs (to build a [[DF2012:Carpenter's workshop|carpenter's workshop]] and the components of a [[DF2012:Screw_pump|pump]])
  
Make sure you have at least one (battle) axe and one 1 pick to cut down trees and mine.
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Make sure you have at least:
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* 1 (battle) axe
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* 1 pick
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to cut down trees and mine
  
 
== Procedure ==
 
== Procedure ==
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==Links==
 
==Links==
 
[http://www.bay12forums.com/smf/index.php?topic=79224.msg2060636#msg2060636| Quantum's original forum post]
 
[http://www.bay12forums.com/smf/index.php?topic=79224.msg2060636#msg2060636| Quantum's original forum post]
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[[Category:DF2012:Guides]]

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