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[toastercultist]

Spoiler (click to show/hide)

The right structure consists of two waterwheels dangling on a screw pump used to create perpetual power, which links to the left structure which pumps water into a reservoir which leads into a pipe underground. There is currently one unblocked channel which was pumped water through until a gear assembly was destroyed. How would you go about purging all of the water from these caverns?

[toastercultist]

Spoiler (click to show/hide)

Also how would you get this dwarf's corpse out?

[gchristopher]

In general, your options for draining [a cavern / a major cistern / the ocean ] will all come down to:

- How do you want to get rid of a lot of water? Options:
  - Straight down into HFS
  - Into an even bigger space below (not an infinite sink)
  - Off the edge of the map
  - Using a portable drain, a minecart sitting on a track stop that dumps into an adjacent solid wall.
  - Atom smashing the water using a drawbridge

- How do you get the water from the unwanted area to your water-removal solution? Fewer options:
  - Pump it out
  - Dig a trench, safely either from one z-level above, or arguably exploitey from below by exploiting how a dwarf standing on an up-ramp with a lowered drawbridge overhead, can dig one z-level up while still standing safely below the lowered bridge.
  - Complex minecart track through the water to haul the water elsewhere shenanigans (A favorite past-time for other reasons)
  - Buckets and sadism?

[Salmeuk]

  - Buckets and sadism?

thats the title of the fourth track on my black metal / dwarf metal / forest synth crossover album

...

gchristopher hit all the points you might make here. I will recommend you pursue the digging of an off-map drain tunnel (where you smooth fortifications into the map edge this can be built in almost any location or z-level), however, make sure that the outflow will exceed inflow otherwise you have simply created an additional area for laggy flow to occur. You can ensure this outflow is fast by a few strategies:
1. build the outflow corridor at the closest map edge and make it 3 or 4 tiles wide
2. build the outflow corridor at a lower z-level than bulk of the water to allow gravity to assist collection
3. built 2+ screw pumps to feed the outflow corridor with speed

recovering the body is only possible if you drain the water unfortunately. you COULD dump magma on the tile and surrounding tiles to isolate then recover it but that tends to be a whole 'nother project..

finally, if you are ready to throw in the towel and CHEAT, using DFhack gui/liquids to spawn magma at specific places can cut the inflow and save you a lot of trouble

[anewaname]

I try to get rid of water is vertically, because the water will drop straight down and drain quicker due to water pressure (of course, there needs to be a large enough place for the water to go, but a few z-levels of staircase down into a hallway that exits into another cavern is enough). Also, while a dwarf is standing on stairs and digging stairs upward, they will not be knocked over when a lake of water rushes down past them and into the lower caverns (but they will drown if there is not enough room for all the water flowing down past them).

[toastercultist]

Thank you everyone, I followed the screw pump technique and there's only  mud now!