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40d:Dam
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In DF a dam can be built across a river or brook.
Uses of a dam
- Blocking the flow of a river to modify it's path.
- Large amounts of water storage.
- Water based Traps.
- Building a large lake.
- Building a dam of floodgates can create a massive wall of water if they are all opened at once.
Dam construction
Constructing a dam (probably) requires the draining of a River so walls or floodgates can be built on the river's bed. If your map freezes during winter this should be easy.
After you have access to a river bed simply build a series of walls on top of it, blocking the path of the river. When the water comes back it will fill up the gap as far as it must to let the blocked water flow further. REMEMBER the water has to flow somewhere.