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[A_Curious_Cat]

So, I dug out a reservoir (complete with a drain), dug an aqueduct, and even managed to include a toggleable flow reducing device made of three 2x1 bridges.

To fill the aqueduct with water, I tunneled underneath the stream my embark had, and used the bridge exploit.  Everything went well, until one of my fisherdwarves drowned.

Is there any reason that fisherdwarves are attracted to giant sucking holes in bodies of water, and what can I do to keep them at a safe distance (or at as keep them from drowning)?

[anewaname]

You can control where they fish and gather water, by placing zones and setting the standing orders for use of zones. You can have dozens of dwarfs fishing at a one-tile zone.

[DwarfStar]

Any time you mess around with water, you have the possibility of creating deadly dwarf-traps by accident. Dwarves will try to path through water with less than 4 units of water, oblivious to the dangers of moving water. So if an item falls down into a drain, and a dwarf gets an idea to go get it, he’ll go for it, potentially to his doom if the water is moving too fast for him to get out. Then his corpse and all his items become enticing reasons for other dwarves to try to get in there.

You can try to make sure to forbid all the things down in the drain, but things can fall down in there later. Best to build a bridge over the drain intake, or floors or something.

[orius]

Maybe it's a curse the mermaids put on the dorfs because of that whole farming business....   

Then again, dorfs don't need any excuse for their stupid beyond the nearest barrel of ale.

[A_Curious_Cat]

I’ve got a similar setup almost ready to go in a new fort (still need to install bridges and doors, dig out and smooth a control room, and build and link up levers).  The main difference is that the point where I’m planning on breaching the stream is at the bottom of a ravine.  Will the (multi-z-level) vertical walls of the ravine keep my dwarves out of danger, or do I still need to setup additional safeguards?

[DwarfStar]

I’ve got a similar setup almost ready to go in a new fort (still need to install bridges and doors, dig out and smooth a control room, and build and link up levers).  The main difference is that the point where I’m planning on breaching the stream is at the bottom of a ravine.  Will the (multi-z-level) vertical walls of the ravine keep my dwarves out of danger, or do I still need to setup additional safeguards?

Your dwarves would have to have a path down there to build the thing, probably, but if you deconstruct/block it by whatever means, then the dwarves will be safe. Just be sure the dwarf that severs the link is on the correct side first! They’ll stand on whichever side the material comes from, so as long as you don’t pick a stone from inside the entombed area (forbidding can be useful here).

You can test whether the dangerous area is pathable by trying to build something there: if no materials are available (except whatever stone etc is in the non-pathable area) then you’re safe. No matter how many x pig tail sock xs (or, often, logs) fall or wash down there.

[DwarfStar]

Oh, but I guess the game won’t even let you try to build in a working drain area. A slightly more laborious approach is to tell a squad to move there, and see if they try or if they say Soldier (Unreachable Locatiin).