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Author Topic: Evaporation  (Read 982 times)

Balathustrius

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Evaporation
« on: December 05, 2008, 12:29:03 am »

So towercaps grew unnoticed in the drainage shaft to the chasm, and as a result the lower levels of my fortress are 7/7 in water.  I managed to get the floodgates closed just before the water rose through the grated floor in my grand dining hall, but now I'm not sure how to clear out the towercaps and get the waterfalls moving again.

The wiki says water above 2/7 evaporates slowly if at all; can anyone confirm that no amount of waiting is going to dry out the deep recesses of my fort?  Also, I have wells; should I stop making alcohol and let the dwarves drink the lower levels dry?  Does drinking lower the water level of a pool?

In true dwarven fashion, this water system has been keeping my fortress on the edge of obliviation from the beginning; first the giant cave crocodiles I unwittingly let loose into the mines when I tapped into the cave river, then the lizardmen that killed the human guild representative, incurring the wrath of The Watchful Confederacies, and now this.  And I haven't even breached the magma pipe, yet.
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Zorgn

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Re: Evaporation
« Reply #1 on: December 05, 2008, 12:44:47 am »

If you let that water sit, you can write off that area of the fort  forever. I doubt wells will do anything as well.

My suggestion here is to dig one hell of a pit under it all, find a way to breach the flooded area, and wait for it to drain into your new pit. Or, if you could find a way to make a shaft from the surface down to the flooded areas, you could make a pump tower and get rid of it that way.

If you could, upload your map.
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Yami

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Re: Evaporation
« Reply #2 on: December 05, 2008, 12:45:56 am »

couldn't you just mine your way into the chasm and dig through the side into where the tower caps are ad then just chop em down?
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Maltay

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Re: Evaporation
« Reply #3 on: December 05, 2008, 12:53:58 am »

So towercaps grew unnoticed in the drainage shaft to the chasm, and as a result the lower levels of my fortress are 7/7 in water.  I managed to get the floodgates closed just before the water rose through the grated floor in my grand dining hall, but now I'm not sure how to clear out the towercaps and get the waterfalls moving again.

The wiki says water above 2/7 evaporates slowly if at all; can anyone confirm that no amount of waiting is going to dry out the deep recesses of my fort?  Also, I have wells; should I stop making alcohol and let the dwarves drink the lower levels dry?  Does drinking lower the water level of a pool?

In true dwarven fashion, this water system has been keeping my fortress on the edge of obliviation from the beginning; first the giant cave crocodiles I unwittingly let loose into the mines when I tapped into the cave river, then the lizardmen that killed the human guild representative, incurring the wrath of The Watchful Confederacies, and now this.  And I haven't even breached the magma pipe, yet.

Any water, anywhere, with a depth of 1 will evaporate over time.  Water outside, no matter the depth, will evaporate over time.  The hotter it is, the faster this occurs.  I believe if your water is inside, under your fortress, and deeper than 1, it won't evaporate.  That being the case, you'll need to either drain it off into a cistern or build screwpumps and put it back where it came from.  Either way, an excellent opportunity to construct something large, dangerous, and definitely dwarven.
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Hamster Man

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Re: Evaporation
« Reply #4 on: December 05, 2008, 12:56:28 am »

Easiest way? Hook up a drainage pump system 1 z level above the blockage and having it drainage back into the original  aka a bypass.
Once it's all pumped out, go in and cut down the towercaps. To prevent future tower-cap growth, pave it with stone (either using a paved road, or floor - just smoothing it won't do it, I found out :( )
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So there's that, as well. It looks like the only chronic problems that water can't cure are nausea and cave spider bites.
Which, coincidentally enough, can be cured by magma.

Balathustrius

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Re: Evaporation
« Reply #5 on: December 05, 2008, 01:03:48 am »

If you let that water sit, you can write off that area of the fort  forever. I doubt wells will do anything as well.

If you could, upload your map.

Arg, it is as I feared.  Thanks.  Here is my map as per request; having never uploaded one before, I didn't notice an option to include points of interest, so you have to scroll down a few levels to see much.

http://mkv25.net/dfma/map-4066-inkdoors

couldn't you just mine your way into the chasm and dig through the side into where the tower caps are ad then just chop em down?

Yeah, but I really didn't want to mar my beautiful tunnels with other tunnels.  Oh well.
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Balathustrius

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Re: Evaporation
« Reply #6 on: December 05, 2008, 01:05:08 am »



Any water, anywhere, with a depth of 1 will evaporate over time.  Water outside, no matter the depth, will evaporate over time.  The hotter it is, the faster this occurs.  I believe if your water is inside, under your fortress, and deeper than 1, it won't evaporate.  That being the case, you'll need to either drain it off into a cistern or build screwpumps and put it back where it came from.  Either way, an excellent opportunity to construct something large, dangerous, and definitely dwarven.

Screwpumps!  A brilliant idea!  Thanks. 
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eerr

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Re: Evaporation
« Reply #7 on: December 05, 2008, 02:15:49 am »

use one pump to allow it to drain in your dining hall

it should evaporate faster than it can be pumped,
eventually lowering to between 1 and 2 average
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Magua

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Re: Evaporation
« Reply #8 on: December 05, 2008, 11:29:42 am »

Also, I have wells; should I stop making alcohol and let the dwarves drink the lower levels dry?  Does drinking lower the water level of a pool?

Yes, drinking from a well removes 1/7 water from that well.  With enough drinks, dwarves can eventually drain a cistern dry.

But it's a loooong process.  Use pumps.

In addition, be aware that floodgates and raised bridges will simply destroy water.  If you can direct the water into a room with a 10x10 raised bridge, you could autopull the bridge's lever, and it will destroy 100 tiles of water each time.  Short of draining directly into a pit or chasm, that's probably the quickest way of removing it.
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Hamster Man

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Re: Evaporation
« Reply #9 on: December 05, 2008, 01:20:46 pm »

Destroy water with a drawbridge... that falls under large, dangerous, and dwarven doesn't it?
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So there's that, as well. It looks like the only chronic problems that water can't cure are nausea and cave spider bites.
Which, coincidentally enough, can be cured by magma.

Kazindir

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Re: Evaporation
« Reply #10 on: December 05, 2008, 04:18:20 pm »

If you let that water sit, you can write off that area of the fort  forever. I doubt wells will do anything as well.

My suggestion here is to dig one hell of a pit under it all, find a way to breach the flooded area, and wait for it to drain into your new pit. Or, if you could find a way to make a shaft from the surface down to the flooded areas, you could make a pump tower and get rid of it that way.

If you could, upload your map.

Unless it was changed in 40d, dwarves using wells do indeed take water out of the well. You'll only notice it if you've got an isolated cistern and it's your main source of drink, but the water level will streadily (if slowly) drop.
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chonger

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Re: Evaporation
« Reply #11 on: December 05, 2008, 07:39:05 pm »

You can tell your dwarves to dump the water somewhere (designate some area as a pond). That will eventually get enough water out via the well.
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MuonDecay

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Re: Evaporation
« Reply #12 on: December 06, 2008, 01:12:15 am »

If you let that water sit, you can write off that area of the fort  forever. I doubt wells will do anything as well.

My suggestion here is to dig one hell of a pit under it all, find a way to breach the flooded area, and wait for it to drain into your new pit. Or, if you could find a way to make a shaft from the surface down to the flooded areas, you could make a pump tower and get rid of it that way.

If you could, upload your map.

Unless it was changed in 40d, dwarves using wells do indeed take water out of the well. You'll only notice it if you've got an isolated cistern and it's your main source of drink, but the water level will streadily (if slowly) drop.

One of the conveniences of your cistern being dug out of the aquifer is avoiding that issue.
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BurnedToast

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Re: Evaporation
« Reply #13 on: December 06, 2008, 02:18:07 pm »

Also, I have wells; should I stop making alcohol and let the dwarves drink the lower levels dry?  Does drinking lower the water level of a pool?

Yes, drinking from a well removes 1/7 water from that well.  With enough drinks, dwarves can eventually drain a cistern dry.

The dwarves will drain 1/7 of the water into the bucket in the well, which will then contain 10 drinks worth of water. After the 10 drinks are gone, they will drain another 1/7 to get 10 more drinks worth. So it's actually 10 drinks worth for every 1/7 you need to remove.

According to the wiki, each dwarf drinks 18 drinks per year which sounds about right to me. So, by forcing them to drink water, you will drain almost 2/7 per dwarf, per year meaning yes it will take quite some time to empty it, and your dwarves will be working very slow due to no alcohol. The other problem is wells stop working when the water gets too shallow (2/7 or 3/7 I think, not sure) so they can't finish it off, however they can wade though that level of water so you can send them down there to chop the trees or whatever.


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