I'm not exactly asking for help with this, as I doubt it really can be helped short of boarding up the entire problem with floor tiles, but instead I'm sharing an idiotic, enraging, and, in retrospect, amusing little story.
I've been building my fortress for a year now, and have accidentally let in beasts from the caverns, which my brave dwarves fended off with crossbow, axe, and pick, until it was boarded up for good. I've been attacked by vicious wild badgers and ravens galore, as well as a lion for some reason, and held them off valiantly. There has been loss, though; 5 of my dwarves have been killed by... a waterfall.
The deathtoll includes;
-both of my former fisherman (I quit bothering with a fishing industry after that.)
-my almost legendary woodcutter
-my replacement woodcutter
-and for some godawful reason, my cook.
This is probably the toughest adversary I have ever faced in this game, believe it or not, because no matter what I do, the silly dwarves seem to see the 2 and 3 deep water at the edge of the waterfall as passable terrain, and attempt to a. drink water from there (when I run out of booze, hence my latest ragequit as my legendary +5 miner drowned himself with my only pick when i didnt realize wine production had ground to a halt) and b. pass to the other side of the map by the waterfall, instead of the conveniently built bridge i have.. I'm going to wall it off soon, but as of right now i don't have the resources. So until I can, I guess I'm just saving a lot, and preparing to get angry and throw things as my most valuable suicidal idiots dwarves kill themselves.