Funny enough I was considering this the other night. The big problem is that you can't overlap your embark tiles with old fortresses, and that you can't build within a few tiles of the edge of the map. Thus any attempt at flooding would be hindered by the ~6-8 (can't remember how many tiles you can't build on at the edge) tile wide holes in the map combined with any problems evaporation may pose. Now assuming pumps work in adventurer mode it would be possible to flood a large section of the world by building a pump stack to a certain level in a valley. If you find a valley with mountains on all sides you should be able to fill it like a basin. Any holes in the valley smaller than 16 embark tiles are pluggable through making a 16x2 embark size fortress and building walls between the two mountains.
Any tests with this would be a longshot as I'm not sure how liquid flow is handled in adventurer mode as in I'm not sure how close you have to be for the action to take effect, as it seems like the game would have to only calculate nearby liquid flow in order to save processing power. So it may just be that despite a perfect theoretical setup the magma would only move if you were nearby, limiting any flooding to a small area.
Tldr: Requires SCIENCE!!!
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Topic: Pumps? (Read 1545 times)