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[ptb_ptb]

Like the subject says. Can things swim through vertical bars like they can swim through fortifications?

I had a nasty experience with fortifications and a forbidden beast, so I want to be sure.

[GhostDwemer]

Nope, nor can they be pushed through by moving water. Vertical bars and grates can be destroyed by building destroyers, though.

[ptb_ptb]

Nope, nor can they be pushed through by moving water. Vertical bars and grates can be destroyed by building destroyers, though.

Eh, nothing is perfect.

I've just watched a group of buzzards fly seven tiles along a river under a floor to get into my place. It must have been at least 6/7 where they got in, but that didn't stop them. I've got a grizzly bear and a giant dingo stationed under the waterfall. Buzzard bits have been flying everywhere.

[PatrikLundell]

My standard answer to access restiction is raised drawbridges. If you want to be able to draw water out of the river my early suggestion would be a drawbridge closed airlock tunnel (one bridge at each end) with a a floor grate above the end (on the inside of the second drawbridge) and a screw pump. The bridges would be opened one at a time, such that the only time you'd get critters through would be if the were invisible (or you didn't check for them). A later approach would use a powered screw pump where the intake side is completely walled off, so even if a critter would be able to climb up through the grate, it wouldn't get further.
If the water isn't going anywhere sensitive (such as being dropped on top of magma to create obsidian, not the public baths), I'd skip the pump and just use a single bridge (although the outlet would have a bridge as well, and there might be additional bridges for flow control purposes if I want to branch the flow).

[Nikow]

Nope, nor can they be pushed through by moving water. Vertical bars and grates can be destroyed by building destroyers, though.

Eh, nothing is perfect.

I've just watched a group of buzzards fly seven tiles along a river under a floor to get into my place. It must have been at least 6/7 where they got in, but that didn't stop them. I've got a grizzly bear and a giant dingo stationed under the waterfall. Buzzard bits have been flying everywhere.

6/7 is completly fine for creatures who know how to fly or swim. 7/7 will start drowning. 5/7 will drown non swimmers.