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[Girlinhat]

Self-drowning elven traders.  PERFECT!

If you try to remove the ramps, your miner will fall off.

[khearn]

One thing to note is that restricting the area won't stop the dwarves if that is the only way to get to where they want to go. Restricted traffic zones will make dwarves prefer a different route, but don't ever completely forbid travel through them. So be sure to build a bridge quickly when you embark. Or maybe build walls next to the top of the fall so they can't path to the shallow area.

[ivanthe8th]

I can confirm a dead kobold thief, victim to the same pathfinding.

[Sutremaine]

Build floors over the ramps as many tiles back from the waterfall as necessary.

[Don57]

I've been experiencing this bug, too.  Looks like it's an unintended consequence of having slopes along the shores of a river. 

The water at the the last tile of the river drops to 1/7 as the water moves into the adjacent open space (i.e. the top of the waterfall), and the dwarfs think it's a great idea to cross the river here...only, the next second, water from the next tile up the river moves into the shallow river square they just entered and *fwoop* off the go to their deaths. 

Even setting the river to be restricted doesn't seem to deter them.  I've wasted four reclamation teams trying to get a fortress built near a waterfall.  I tried building a bridge a ways off from the edge, but no luck.  I couldn't even build walls along the edge of the waterfall to keep dwarfs from getting to that shallow river squares; the dwarfs just kept running into the shallow water and being swept off the cliff while trying the build the walls.

So far there does not appear to be any way to prevent your dwarfs from dying this way.

I hope this gets addressed somehow -- even if it means getting rid of sloped rivers.  It's impossible to build near waterfalls now, which I love doing.

[yllamana]

I've been running into a similar problem, not with waterfalls but with channeling by water in general. In the first instance, I had a one-tile channel designation next to some underground water. My dwarf channeled downwards, then decided the ramp below would be the best way to get back to the fortress, stepped into it and immediately turned into an ice cube as the adjacent water rushed in.

In the other instance, my dwarf channeled next to river water, stepped into the momentarily-empty tile, got washed inside a nearby wall grate a little further down and drowned.

I could've saved the first one by making a staircase instead of a ramp, but I'm not sure about the second one.

Maybe it'd be possible to avoid the waterfall problem by making the entire map a burrow, then cutting out the top of the waterfall (at the riverbed, not the space above it) and assigning all the dwarves to the burrow. Then your elves and kobolds could take the "shortcut" across the waterfall (maybe set up some grates at the bottom to catch them) while your dwarves avoided it. I suppose the military might be a problem, but you can micromanage them a bit better so maybe it'd be okay with care. Restricted traffic designation just to be on the safe side?

This is making me want to add a waterfall to my forts.