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Difference between revisions of "40d:Flood"

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(Rephrased information on water levels to be more clear, also fixed misconception about mining into damp tiles as tiles one z-level below the water are safe to mine but will be damp.)
 
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There can be up to seven units of [[water]] in a tile:  1/7 is ankle-deep, while at 7/7, water fills up to the ceiling. At 1/7 though 3/7, the water is too shallow to pose a threat and dwarves cannot swim in it, although it is possible that [[aquatic creatures]] can.{{verify}} At depths of 4/7, a dwarf can choose to swim, but is still capable of walking freely. At depths of 5/7 and above, dwarves must [[swimming|swim]]. A dwarf who can't swim can drown in a tile with too much water in it.
+
{{quality|Masterwork|12:46, 22 August 2010 (UTC)}}{{av}}
 +
Flooding generally refers to water getting loose and spreading out over an area, usually in an unregulated fashion.  While this can be useful in creating plots of muddy ground for [[farming]], deliberately setting any amount of water loose in an area is risky at best, and at worst, will result in lots of [[fun#Flooding_accidents|fun]].
  
−
Water in a tile will designate all tiles around it (including those above and below) as "damp". If a [[miner]] encounters damp stone while digging, the designation will be canceled, you will be given a warning, the game will pause and you will zoom to the damp tile. Re-designating the tile to be mined will cause your miner to ignore the damp stone and dig the tile out anyway, although you will receive a new alert for each additional damp tile uncovered. Note that unless you know what is causing the tile to be damp (a [[murky pool]] on the z-level above, for example) and are reasonably sure that removing this section of wall will not breach some other water source, it is advisable to simply avoid digging in that area. A tile will flood if there is a water source adjacent to it, including diagonally.
+
As in real life, water will seek to spread out given open space.  In Dwarf Fortress, this means that water will spread until all tiles achieve a depth of 1/7, or it fills the space it is enclosed in. Water at a depth of 1/7 will eventually evaporate, leaving behind a muddy floor.  Because of this, it would be nearly impossible to ruin a fortress with water from finite sources such as a [[murky pool]]. Note, however, that [[river]]s, [[brook]]s, and [[ocean]]s are considered to have offscreen water sources;  their supply has been observed to be infinite, as has that of [[aquifer]]s. Tapping into one of these without some means of regulating the flow is almost certain to result in [[fun#Flooding_accidents|fun]].
 +
 
 +
Water movement is a major source of lag in the game.
 +
 
 +
Flood speed is counterintuitive. For example, if you build a ramp beneath the bottom of an [[underground pool]] connected to a large drainage shaft leading to a chasm, all the water in the upper levels of the pool will drain down into the drainage shaft leading all the way out into the chasm, filling it all nearly instantly 7/7 with water and submerging your hapless dwarves however far away in the shaft they may be.  But once the space is filled, the flood slows down to the glacial pace at which water usually moves down tunnels, giving them plenty of time to drown.
 +
 
 +
 
 +
== How to flood a fortress ==
 +
{{D for dwarf}}
 +
So all your friends on the forums are recounting tales of the fortresses they've flooded, and you're feeling left out. Fret no more! In a few simple steps, you too can join the ranks of the hydrologically challenged.
 +
 
 +
The key is to tap into a renewable source of water, such as a river, and use its water [[pressure]] to overcome obstacles like distance or altitude. Remember that water always "wants" to rise back up to 1 [[Z-axis|Z-level]] below from which it originated!
 +
 
 +
Side view:
 +
▒≈≈river≈≈ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒o <--well ▒▒▒▒▒▒▒▒▒▒ (well is optional)
 +
▒▒▒▒▒▒▒▒▒▒  channel  ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ your fortress ▒
 +
In this design, water will travel from the river through the channel, then '''up''' through the well and across and down into the rest of the fortress. For convenience, the vertical openings don't even need to be completely hollow chambers--ramps and stairs will work just as well!
  
−
After a flood, the water level in an area will even out, given time.  Therefore it is possible to drain a small [[murky pool|pool]] completely without getting too many things wet.  Larger lakes can be drained with the judicious use of a [[screw pump]] or well-designed networks of channels.  Note, however, that [[river]]s and [[ocean]]s are considered to have offscreen water sources;  their supply has been observed to be infinite, and in order to drain these you must remove water faster than the flow supply.
 
  
−
Deliberately flooding squares can be useful for [[farming]], particularly on squares that need to be muddied before being worked (e.g., fertile land on the surface, and rocky tiles anywhere).  However, water spreads very quickly and floods can get out of control if you don't know what you're doing;  if your map has any farmland that does ''not'' need to be muddied (such as [[peat]] or [[loam]]), then it's probably safest to farm there, without messing around with floods.
+
If some of the levels that you need to flood are higher than the surface of the river, you can use [[screw pump]]s to compensate.
 +
                  ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
pumps-->  %%_  ▒▒▒▒▒▒▒o <--well ▒▒▒▒▒▒▒▒▒▒ (well is optional)
 +
        ▒_%% ▒ ▒▒▒▒▒▒▒ ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
          %% ▒ channel ▒▒▒ your fortress
 +
▒≈≈river≈≈▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
Ordinarily, this above-river fortress would have been unfloodable, but with judicious application of pumps, the water can flow from a higher level than its original source, allowing it to engulf all of your precious bedrooms, workshops, and stockpiles.
  
−
Water movement is a major source of lag in the game.
+
=== Common pitfalls ===
 +
==== Building the well above the level of the river ====
 +
                  ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
                ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒≈≈river≈≈ ▒▒▒▒▒▒▒▒▒▒▒o <--well ▒▒▒▒▒▒▒▒▒▒ (well is optional)
 +
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒ ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒▒▒▒▒▒▒▒▒▒  channel    ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ your fortress ▒
 +
In this failed flooding attempt, the water moves through the channel but only rises to the level immediately ''below'' the well. This means that the well will be usable and the fortress remains safe and dry. If you were to [[dam]] the river, however, this method would be successful. Be warned that [[ice|freezing water]] and everything else disconnecting the water from the end of the river but not from the source will have the same effect.
 +
 
 +
==== Re-pressurization with pumps ====
 +
▒≈≈river≈≈ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒o <--well ▒▒▒▒▒▒▒▒▒▒ (well is optional)
 +
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒ ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒▒▒▒▒▒▒▒▒▒ %% <--pump  ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ your fortress ▒
 +
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒              ▒
 +
Here, the reckless placement of a pump blocks water from flowing directly through; instead, the water level is again "reset" to the same level as the pump, and the well will be safe to use. Our condolences to this fort's pathetically dry dwarves.
 +
 
 +
 
 +
==== Using diagonal tunnels ====
 +
▒≈≈river≈≈ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒o <--well ▒▒▒▒▒▒▒▒▒▒ (well is optional)
 +
▒▒▒▒▒▒▒▒▒▒  channel  ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ your fortress ▒
 +
 
 +
top view:
 +
▒≈≈≈≈≈≈≈≈≈▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒≈≈≈≈≈≈≈≈≈      ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒≈≈≈≈≈≈≈≈≈▒▒▒▒▒▒      o        ▒▒▒▒▒▒▒▒▒▒
 +
▒≈≈≈≈≈≈≈≈≈▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
Be sure not to get lazy and dig tunnels that are connected only diagonally.  Like the use of pumps above, this will prevent water pressure from propagating.
 +
 
 +
==== Using doors and hatches ====
 +
▒≈≈river≈≈ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒o  _<-- hatch ▒▒▒▒▒ (well is optional)
 +
▒▒▒▒▒▒▒▒▒▒  channel  ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
 +
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ ┼ <-- door    ▒
 +
Although this attempt to flood the fortress will have some success, it will be heavily impeded by the presence of doors and floor hatches.  These nefarious devices admit the passage of water only when open, making it likely that a large part of the fortress will remain dry.  Avoid using them.
 +
 
 +
 
 +
{{Category|Physics}}

Latest revision as of 10:32, 11 May 2018

xTATTEREDx  · +FINE+  · *SUPERIOR*  · ≡EXCEPTIONAL≡  · ☼MASTERWORK☼
v50.13 · v0.47 · v0.34 · v0.31 · v0.28.181.40d · v0.23
This article is about an older version of DF.

Flooding generally refers to water getting loose and spreading out over an area, usually in an unregulated fashion. While this can be useful in creating plots of muddy ground for farming, deliberately setting any amount of water loose in an area is risky at best, and at worst, will result in lots of fun.

As in real life, water will seek to spread out given open space. In Dwarf Fortress, this means that water will spread until all tiles achieve a depth of 1/7, or it fills the space it is enclosed in. Water at a depth of 1/7 will eventually evaporate, leaving behind a muddy floor. Because of this, it would be nearly impossible to ruin a fortress with water from finite sources such as a murky pool. Note, however, that rivers, brooks, and oceans are considered to have offscreen water sources; their supply has been observed to be infinite, as has that of aquifers. Tapping into one of these without some means of regulating the flow is almost certain to result in fun.

Water movement is a major source of lag in the game.

Flood speed is counterintuitive. For example, if you build a ramp beneath the bottom of an underground pool connected to a large drainage shaft leading to a chasm, all the water in the upper levels of the pool will drain down into the drainage shaft leading all the way out into the chasm, filling it all nearly instantly 7/7 with water and submerging your hapless dwarves however far away in the shaft they may be. But once the space is filled, the flood slows down to the glacial pace at which water usually moves down tunnels, giving them plenty of time to drown.


How to flood a fortress[edit]

D4Dwarf.png This article or section has been rated D for Dwarf. It may include witty humour, not-so-witty humour, bad humour, in-jokes, pop culture references, and references to the Bay12 forums. Don't believe everything you read, and if you miss some of the references, don't worry. It was inevitable.


So all your friends on the forums are recounting tales of the fortresses they've flooded, and you're feeling left out. Fret no more! In a few simple steps, you too can join the ranks of the hydrologically challenged.

The key is to tap into a renewable source of water, such as a river, and use its water pressure to overcome obstacles like distance or altitude. Remember that water always "wants" to rise back up to 1 Z-level below from which it originated!

Side view: 

▒≈≈river≈≈ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒o <--well ▒▒▒▒▒▒▒▒▒▒ (well is optional)
▒▒▒▒▒▒▒▒▒▒   channel   ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ your fortress ▒

In this design, water will travel from the river through the channel, then up through the well and across and down into the rest of the fortress. For convenience, the vertical openings don't even need to be completely hollow chambers--ramps and stairs will work just as well!


If some of the levels that you need to flood are higher than the surface of the river, you can use screw pumps to compensate. 

                 ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
pumps-->  %%_  ▒▒▒▒▒▒▒o <--well ▒▒▒▒▒▒▒▒▒▒ (well is optional)
        ▒_%% ▒ ▒▒▒▒▒▒▒ ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
          %% ▒ channel ▒▒▒ your fortress 
▒≈≈river≈≈▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒

Ordinarily, this above-river fortress would have been unfloodable, but with judicious application of pumps, the water can flow from a higher level than its original source, allowing it to engulf all of your precious bedrooms, workshops, and stockpiles.

Common pitfalls[edit]

Building the well above the level of the river[edit]

                 ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
               ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒≈≈river≈≈ ▒▒▒▒▒▒▒▒▒▒▒o <--well ▒▒▒▒▒▒▒▒▒▒ (well is optional)
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒ ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒▒▒▒▒▒▒▒▒▒  channel    ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ your fortress ▒

In this failed flooding attempt, the water moves through the channel but only rises to the level immediately below the well. This means that the well will be usable and the fortress remains safe and dry. If you were to dam the river, however, this method would be successful. Be warned that freezing water and everything else disconnecting the water from the end of the river but not from the source will have the same effect.

Re-pressurization with pumps[edit]

▒≈≈river≈≈ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒o <--well ▒▒▒▒▒▒▒▒▒▒ (well is optional)
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒ ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒▒▒▒▒▒▒▒▒▒ %% <--pump  ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ your fortress ▒
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒               ▒

Here, the reckless placement of a pump blocks water from flowing directly through; instead, the water level is again "reset" to the same level as the pump, and the well will be safe to use. Our condolences to this fort's pathetically dry dwarves.


Using diagonal tunnels[edit]

▒≈≈river≈≈ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒o <--well ▒▒▒▒▒▒▒▒▒▒ (well is optional)
▒▒▒▒▒▒▒▒▒▒   channel   ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ your fortress ▒

top view: 

▒≈≈≈≈≈≈≈≈≈▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒≈≈≈≈≈≈≈≈≈      ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒≈≈≈≈≈≈≈≈≈▒▒▒▒▒▒      o         ▒▒▒▒▒▒▒▒▒▒
▒≈≈≈≈≈≈≈≈≈▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒

Be sure not to get lazy and dig tunnels that are connected only diagonally. Like the use of pumps above, this will prevent water pressure from propagating.

Using doors and hatches[edit]

▒≈≈river≈≈ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒▒▒▒▒▒▒▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒o   _<-- hatch ▒▒▒▒▒ (well is optional)
▒▒▒▒▒▒▒▒▒▒   channel   ▒▒▒ ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ ┼ <-- door    ▒

Although this attempt to flood the fortress will have some success, it will be heavily impeded by the presence of doors and floor hatches. These nefarious devices admit the passage of water only when open, making it likely that a large part of the fortress will remain dry. Avoid using them.

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