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[BossChase]

Hi,


Do i need to install a pump before my well to keep my fort from flooding if i'm using a water supply thats higher than my well?

Code: [Select]

Water
| |
| | < = 14 z-levels
| |__________________|Well  |
|_______________Pump______|

Something like that?

[Quietust]

No - a diagonal gap (through which pressure cannot propagate) will also work.

[BossChase]

How would that work?

Code: [Select]

Water
| |
| | < = 14 z-levels
| |
\ \_________________|Well |
 |______________________|

[jwest23]

Diagonal on the horizontal, not vertical.

...after an aborted attempt to represent it myself, I'll just give you a link that explains it much better than I would:

http://df.magmawiki.com/index.php/Pressure#Diagonal_Flow

[Jurph]

A U-Bend (like you're using) will only remove one Z-level worth of pressure.  You could chain together a bunch of U-Bends (delivering fresh well water to every Z-level!) or you could use the diagonal 1x1 "dwarven pressure regulator" to eliminate water pressure entirely.  The water behind the regulator will still be pressurized, and if you try to tap the supply upstream of the regulator, you *will* flood your fort.  If you draw unpressurized water downstream, you'll have no such problem.  You could then use a pump stack and floodgates to re-elevate water to any Z-level where you want fresh drinking water.

How would that work?

Like this: http://df.magmawiki.com/index.php/DF2010:Pressure

[Uristocrat]

It's more work, but I've found that it's easiest not to worry about what places have or do not have pressure and to make anti-pressure formations around the well shaft itself.

So, beneath my well, there's a + sign of walls (with the shaft in the center) on any level where water can get into the well shaft from the side.  The level with the well doesn't need that.

I say this because I once made a complex setup to feed multiple wells.  I tried removing pressure at all the inlet points, missed one, and would've flooded the entire fortress if I had not made an emergency drainage pump ahead of time out of paranoia.

[BossChase]

Whats a good number of wells to have?

I was going to put one in the Booze Hall then put the hospital some where near by.

[Quietust]

A U-Bend (like you're using) will only remove one Z-level worth of pressure.  You could chain together a bunch of U-Bends (delivering fresh well water to every Z-level!)

Actually, no you can't, since U-bends do not remove any pressure at all - they only reduce apparent pressure when you're tapping the side of an unpressurized body of water (i.e. a river that's being permitted to drain off the map edge) because they're forcing the water to move downward from its original level (and to which it cannot return unless the source itself is pressurized).

[Hyndis]

You only really need one well. To ensure the water is always fresh I first use a diagonal to break water pressure, and then use a pump to pump water into a completely artificial cistern. Its made entirely out of rock blocks. Preferably marble. All walls and floors are made out of rock blocks. So far this has always worked to ensure the water in the well is fresh.

[Fredd]

Anyone had any luck using fortifications, for depressurizing water?

[indigo]

Although fortifications should prevent any undesired guests from making an amphibious assault, as far as I know they don't affect water pressure at all?