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40d:Floodgate
Floodgates are objects that regulate the flow of fluids. A wood, stone or metal floodgate will suffice for water flow, but only materials with a high melting point such as steel will hold back magma. Floodgates can be linked up to levers or pressure plates to create farms, a water source or as a defense against invaders. An open floodgate can be walked through, a closed one can not.
Steel floodgates are essentially "one-use only" because the magma will melt the stone mechanism, thus breaking the open/close trigger. This does not appear to take place if you use bauxite or raw adamantine mechanisms.
If there is no roof above your floodgate and there is a water source from a higher elevation, the water might spill over it.
In the new version, floodgates are almost like doors with the 'Forbidden' option set at all times.
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