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[mathi]

I observed in my fortress that it is impossible to drain the caverns into fortifications at the edge of the map on a lower level. It seems that the water is regenerating in the lake itself where it borders the map. Since I couldn't find a description of this behavior on the wiki or the forums I was wondering if someone also noticed this.

It might be useful for people who need flowing water on a map without aquifer or river.

Luckily for me the pointless and difficult project of draining the caverns has just become more difficult! I am planning something with a lot of automated pumps, fast floodgate installation and wet dwarves. Maybe I'll dedicate a team of dwarves to this operation, and teach them how to swim first.

[Drago55577]

If water is at th edge of the map, in becomes an infinite water source.


I answered  question for the first time!

[Quantumtroll]

I observed in my fortress that it is impossible to drain the caverns into fortifications at the edge of the map on a lower level. It seems that the water is regenerating in the lake itself where it borders the map. Since I couldn't find a description of this behavior on the wiki or the forums I was wondering if someone also noticed this.

I always considered water on the map edges to work like a Dirichlet boundary condition, i.e. the water level on the edge is constant... 

Luckily for me the pointless and difficult project of draining the caverns has just become more difficult! I am planning something with a lot of automated pumps, fast floodgate installation and wet dwarves. Maybe I'll dedicate a team of dwarves to this operation, and teach them how to swim first.

Depending on the cavern geometry, it's probably easiest to simply do a controlled cave-in to insta-floodgate the edge of the lake.  Then just build pumps on the new wall and pump the water onto the map edge. 

[mathi]

Thanks for the tip drago55577.

Maybe I'll have to use a 'controlled' cave-in along the way, but for now I am going to make a needlessly complex system with lots of wooden structures, dysfunctional water wheels, abandoned pumps and permanently powered axles.

[Garath]

some way of damming flows and such would be nice

[Drago55577]

Yea...like ice rays and controllable magma turrets.