40d:Water

Water is a fluid found all over the world. It flows from mountain springs, forming the world's oceans, lakes, rivers, and brooks. Water falls as rain and snow, and freezes into ice. Water is home to aquatic creatures. Most creatures can swim in deep water, and like all fluids, air-breathing creatures can drown in it. Water comes in two varieties: freshwater, which makes up almost all inland water, and saltwater, which fills the seas; these are home to different aquatic creatures. If dwarves do not drink they will become dehydrated(thirsty) and if they do not quench that thirst then they will eventually die. Injured dwarves will only drink freshwater, though normally dwarves prefer their booze.

In addition, water can be stagnant or murky. This may cause dwarves to have unhappy thoughts if they drink from it.

When water comes into contact with creatures and objects, they become "contaminated" with it. Soil and stone becomes damp or muddy, which can be used for farming.

Water is displayed with the symbols ≈ and ~, sometimes with different blues, brown, and white to show ripples, pollutants and flow. (The game can be configured to show the depth instead). Dark-colored water symbols indicate the water is one Z-level below the camera level. Water has 7 depth levels per tile, with 1 being perhaps ankle-deep, and 7 filling the tile completely. Dwarves and other humanoids can walk through water up to depth 4. At 4 they can choose to walk or swim, any deeper and they must swim to pass through the tile.

Every material sinks in water.^{v0.27.169.33a}

The tiles above brooks are treated as floor tiles. They are passable to creatures, and objects do not fall into them.

Water in Fortress Mode

In addition to drinking, pools and rivers can be used for fishing. To specify a pool of water as a water source, fishing zone, or pond, you need to create activity zones at the level above the water. The "level above the water" is the level at which the surface of the water is at foot-level instead of ceiling level. Water can be bridged, and can also be used to make a moat.

Water can be moved by digging channels or tunnels, using buckets, or by constructing a screw pump. Dwarves will use buckets to fill a pond. Screw pumps (operated by dwarf or machine power) can move water vertically and horizontally. Transferring water down channels/holes to lower levels can be hazardous due to water pressure.

Lakes can be drained by digging into the side of them. Rivers can also be redirected in this manner. It is only possible to dig directly up into a water-filled tile using stairs.^{v0.27.169.33c} Fish and other aquatic creatures will stay in the water as it moves, but may end up on the ground if the water becomes too shallow. Drained lakes that are outside are filled by melting ice and snow, but not by rain.

Tiles adjacent to a water-filled tile are labeled "damp" and flash the water symbol when accessing the designations menu. When a miner discovers a damp tile, he cancels the mining designation, the game pauses, and the camera centers on the tile. This happens for every damp tile discovered, and each must be designated again before a miner will dig it out.^{v0.27.169.33a} Digging under a water-filled tile does not actually drain it, even though you receive multiple warnings about damp tiles. If a tile already appears to be damp when it is designated, no warning will be given.

Somebody who falls into water, for example, a kobold thief, will then have a "water covering" on nearly every part of their anatomy. This is listed under v,inventory and is shown in green.

Water wheels can be used to generate mechanical power from flows.

The water in a tile can be destroyed by closing a floodgate or door on it (via a lever), by lowering a bridge onto it, or by evaporation. Thus water mass is not conserved and it is possible to run out of water on maps without an infinite source(such as an ocean or aquifer). It is also possible to get rid of excess water by letting it flow into a river.