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[quarague]

is there a way to build a well that is feed by an aquifer above it? I channeled out some stuff below the aquifer but it always completly floods, I barely got the miners out there without anyone drowning.

[Yaotzin]

You need to read up on pressure on the wiki. It's pretty simple - water will flood to whatever level the source is from. There are various ways to control it though.

[ASCIt]

floodgate.

[Yaotzin]

Floodgates are a quick and dirty method :< Much nicer to have your reservoir always full because the pressure is right!

[martinuzz]

diagonal flow removes pressure

[white_darkness]

Dig out your cistern, then excavate the passage towards the aquifer, if it's above the well location, make sure you have a diagonal at the cistern end of the feed line, instead of horizontal or vertical, this way the accumulated water pressure from dropping down is eliminated.  There's nothing like having your well overflow and fill up everything up to the aquifer source.

You'll also want to cover the floor of the feed line before hand, either with roads, or just a stockpile designation.  Once done, send a "lucky" miner to hack out the rock on the border of the aquifer, and it should start trickling out.  It does move somewhat quick, but out of a few hundred tries, I've never had a dwarf drown doing it.

I've had some other remarkably hilarious drowning situations though.

[Loud Whispers]

diagonal flow removes pressure

It depressurizes, but this water can still be pressurized :/

Easiest way is just to dig a room above the aquifer and channel down lines through floor, perfectly safe and wells can be built over it (going to nab scrn caps)

[Loud Whispers]

Spoiler (click to show/hide)

Should look like that

[white_darkness]

Definitely simpler than my long spiel. 

Heh, though I had great fun when I tried to expand to another well, and carved a fortification into the existing cistern, and the water shot across the way, and slammed into the wall of the new storage facility, about 50 tiles away.

[Vehudur]

OK, first locate the damp layer below the aquifer.

When you have that located, below that build a room that looks like this:

Code: [Select]

X = wall
# = floor grate (channeled out below)
F = floodgate
* = floor

XXXXX
XX##X
*F#XX
XX##X
XXXXX
And on the level below that:

Code: [Select]

X = wall
# = floor grate (channeled out below)
F = floodgate
* = floor

XXXXXXX
XXXX**X
*F#**XX
XXXX**X
XXXXXXX
Below that grate is a channel going down the desired number of Z levels. 

It is important that you ensure all passages used in the construction of the downward channel are sealed properly to stop water BEFORE you do the last step in order to prevent excessive water based FUN.

At the bottom, build this exactly:

Code: [Select]

X = wall
* = floor
F = floodgate

XXXXXX
XXF*XX
X*X*** (To TOP level of cistern for well)
XXF*XX
XXXXXX
The cistern should be constructed as desired with a path directly to this device above.  This device is a "pressure reduction valve", safely turning pressurized water into unpressurized water.  There are many designs, but they all do the same thing - diagonal flow removes pressure.

The floodgates are optional.

The distance to the cistern should be as short as possible.  The longer the distance is, the longer the well will take to fill.

When everything is complete, dig out an upward ramp into the base of the aquifer like this:

Code: [Select]

X = wall
# = floor grate (channeled out below)
F = floodgate
* = floor
^ = upward ramp

XXXXX
XX##X
*F#^X
XX##X
XXXXX
If done correctly, water will gush from the upward ramp and pour down the grates.  Your miner should be able to escape, and this level as well as the level below this should be sealed off for optimal fun prevention.