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[TheKaspa]

I have digged a pool feeded by a river in order to install a well.
Since the river is level 0, I digged a -1, -2 and -3 cavern in order to get three levels under my well (built above ground and protected by a 1-level tower).

Now I designed a -3z level meeting hall with a channelled space for an underground well. I digged a channel to the bottom of the water basin. Now I tried digging the one-tile that separed the tunnel from the pool but I managed to drown my living area. Is there a way to not drown everytihing?
I was thinking about a floodgate, or a separate pool that I can fill using the "pond" option. Suggestions?

[weenog]

The problem is pressure.  Quick and dirty, the falling water from the river is going to try to reach a level as high as the source (the river), your well backs up and your dining room becomes an indoor swimming pool.

There are a few ways you can handle this.  The simplest is to force the water to pass through a diagonal gap on the highest level you want it to reach.  Water flowing through diagonals loses all pressure.

[TheKaspa]

Or could I make a second tunnel under the first, just blocking the above in certain places? Like that:

Code: [Select]

==\--/==\--/==\--/==\--/==\--/==\--/==
--\==/--\==/--\==/--\==/--\==/--\==/--
?
Would it work?

[slink]

This is how I build my wells, on the first level below ground.  "s" is the surface of both the land and the water, "b" is the water source, "r" is solid rock, "c" is a channel, "_" is a floor, "g" is a floor grate over a hole, and "W" is the well.  There are actually four grates, one near each corner.  The well is centered.  The grates keep anything from coming up through the well.

Code: [Select]

sssssssssssssssssssss
bbbbcrrrrr_____W_____
rrrr__crrr__g_____g__
rrrrrr_______________


[iofhua]

At the level you want to reduce the water pressure do this:

                            0000000
                            000~000
low-pressure water ~~~0~~~~ water coming from high-pressure source
                            000~000
                            0000000

Making the high-pressure water hit a wall and go through 2 diagonal tiles that merge back into one hallway reduces the pressure to zero. Or at least, greatly reduces it. I'm not sure of the math involved. I usually use a few of these pressure-reducers just to make sure my fort doesn't get flooded.

Does the pressure reduce if it goes through just one diagonal space? I always thought that it was water coming together in one space from 2 different directions that caused the pressure drop, sort of like it was neutralizing itself.

[i2amroy]

Does the pressure reduce if it goes through just one diagonal space?

IIRC, yes.

[TheKaspa]

At the level you want to reduce the water pressure do this:

                            0000000
                            000~000
low-pressure water ~~~0~~~~ water coming from high-pressure source
                            000~000
                            0000000

Making the high-pressure water hit a wall and go through 2 diagonal tiles that merge back into one hallway reduces the pressure to zero. Or at least, greatly reduces it. I'm not sure of the math involved. I usually use a few of these pressure-reducers just to make sure my fort doesn't get flooded.

Does the pressure reduce if it goes through just one diagonal space? I always thought that it was water coming together in one space from 2 different directions that caused the pressure drop, sort of like it was neutralizing itself.

That's a great advice, easier to do for me than the others!

[weenog]

                            0000000
                            000~~~~~ water coming from high-pressure source
low-pressure water ~~~0000
                            0000000

^ is simpler and accomplishes the same thing.

There aren't actually "high pressure" and "low pressure,"  There are just "pressure" and "no pressure."

[Tfafalcon]

So does the 'no pressure' water no longer flow up U-bends, just like magma? I thought it just 'reset' the water's pressure. For example if the diagonal passage is at Z level 0, then the water it filters will only rise up to 0. So using the words low pressure might be the right idea.