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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.)
(Did my best to get rid of the redundancies between flooding and water.)
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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.
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Flooding generally refers to water getting lose 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]].
  
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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.
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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|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. Tapping into one of these without some means of regulating the flow is almost certain to result in [[fun#Flooding_accidents|fun]].
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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.
 
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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.
 
  
 
Water movement is a major source of lag in the game.
 
Water movement is a major source of lag in the game.

Revision as of 00:03, 20 January 2009

Flooding generally refers to water getting lose 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 pool. Note, however, that rivers, brooks, and oceans are considered to have offscreen water sources; their supply has been observed to be infinite. 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.

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