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[Samoorai]

So, fortifications block creature access and can't be destroyed. This is great as it stops all the nasties getting in through them. Unless they're underwater, in which case they don't stop a damn thing!   How the hell do I stop the dozen or so forgotten beasts from getting in while still letting in water?

[beekay]

Eh? Fortifications should be quite enough to stop any underwater creature from entering. If that's changed since 40d, there's no way I know of to provide a constant stream of safe water.

[Samoorai]

They don't path through them, so they THINK that fortifications are impassible, but they can still wander through them/get sucked through with the water flow. Then they see all my lovely mechanical stuff and poke it all till it breaks.

[JoRo]

Vertical bars, maybe?  Though those might be susceptible to building destroyers.  Vertical bars behind fortifications?

[Lord Vetinari]

Fortifications are good enough, but not perfect. If there's no flow, i's virtually impossible to pass through. Multiple fortifications in a row can raise the chances that something can't go through.

If you want to be 100% safe, go one level up, always and for everything, then put hatches connected to levers. Close them when there are ambushes/FBs. and nothing can enter.

[schussel]

wether build in a diagonal angle to the channel to stop pressure and a fortification behind taht or   as i often do put up a fortification then a wallgrate then another layer of fortifications