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This page is about the Water Tank added by Railcraft. For other uses, see Water Tank.
Water Tank

Required modulesTransport

The Water Tank is a multiblock structure added by Railcraft. It is used to store and collect Water. This multiblock structure will passively collect Water depending on the environment it is built in (see Water). The tank can hold a maximum of 400 Buckets of Water.


It cannot be built directly next to another Water Tank; there must be at least one block in between. It is built in a 3x3x3 cube with a hollow center out of Water Tank Sidings.


The Water Tank will automatically insert water into pipes and adjacent liquid inventories (such as a BuildCraft Tank) connected to the sides and bottom of the tank. Water can be piped into the Water Tank using fluid pipes connected to the top of the tank.


To determine the average amount of water condensed by the Water Tank (as of Railcraft, Minecraft 1.7.10), follow these steps:

  1. Get the biome's "Rainfall Property" from the table below. The central column of the structure is the one determining what biome will be used for the calculation.
  2. If none of the blocks in the structure can see the sky, divide this number by 2 and skip to step five.
  3. If at least one of the blocks in the structure can see the sky and it is raining, multiply this number by 3.
  4. If at least one of the blocks in the structure can see the sky and it is snowing, divide this number by 2.
  5. Round the number down.
  6. The water tank will produce, on average, this number of millibuckets every eight ticks (x/8 mB per tick).

Weather is considered to be binary and will exhibit two modes at most in biomes. Arid biomes will not exhibit weather. Rain biomes (the default) will rain. Snowy biomes will exhibit snow.

Biome Rainfall Property Weather
Ocean 5 Rain
Plains 5 Rain
Desert 0 Arid
Extreme Hills 3 Rain
Forest 5 Rain
Taiga 8 Rain
Swampland 9 Rain
River 5 Rain
Hell 0 Arid
Sky (End biome) 5 Arid
Frozen Ocean 5 Snow
Frozen River 5 Snow
Ice Plains 5 Snow
Ice Mountains 5 Snow
Mushroom Island 10 Rain
Mushroom Island Shore 10 Rain
Beach 4 Rain
Desert Hills 0 Arid
Forest Hills 5 Rain
Taiga Hills 8 Rain
Extreme Hills Edge 3 Rain
Jungle 9 Rain
Jungle Hills 9 Rain
Jungle Edge 8 Rain
Deep Ocean 5 Rain
Stone Beach 3 Rain
Cold Beach 3 Snow
Birch Forest 5 Rain
Birch Forest Hills 5 Rain
Roofed Forest 5 Rain
Cold Taiga 4 Snow
Cold Taiga Hills 4 Snow
Mega Taiga 8 Rain
Mega Taiga Hills 8 Rain
Extreme Hills+ 3 Rain
Savanna 0 Arid
Savanna Plateau 0 Arid
Mesa 5 Rain
Mesa Plateau F 5 Rain
Mesa Plateau 5 Rain