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[Josher]

I'm attempting to tap a river from below. Am I correct in my understanding that a dwarf standing in an up/down stair with space for the water below her should be safe? The plan is to simply cut a down stair into the river bed from below.

[PatrikLundell]

I'm not sure the dorf won't be swept away with the water. I know that "hitting damp stone" from below with a miner against the (old) heavy aquifers just had the miner walk down the stairs again (and the fortress flood). If it's safe, you'd still need somewhere above the water level to walk off to the side. If I was to try something like that I'd have a shaft beside the stairs and dig a ramp up from the stairs over the shaft to get the water to fall down the shaft (in fact, I'd do the ramp digging from a tunnel, and then brick up the tunnel to block access into the fortress).

[Sarmatian123]

You do not need to cut anything. You could let river just soak through roof into inside. This would filter it from river animals and swimming invaders.

[PatrikLundell]

You do not need to cut anything. You could let river just soak through roof into inside. This would filter it from river animals and swimming invaders.

Eh, what? Aquifers leak through roofs, but surface sources of water do not.

[Josher]

I'm not sure the dorf won't be swept away with the water. I know that "hitting damp stone" from below with a miner against the (old) heavy aquifers just had the miner walk down the stairs again (and the fortress flood). If it's safe, you'd still need somewhere above the water level to walk off to the side. If I was to try something like that I'd have a shaft beside the stairs and dig a ramp up from the stairs over the shaft to get the water to fall down the shaft (in fact, I'd do the ramp digging from a tunnel, and then brick up the tunnel to block access into the fortress).

Yes, my plan involved a tunnel to get out on the same z as the up/down stair. If I'm understanding your suggestion, you'd cut an up ramp into a tile with the river bed above it? That does sound safer. Slap a grate over the water pipe, dig the up ramp adjacent to it, good to go.

[PatrikLundell]

Make it two grates, one over the other, to secure the top one from building destroyers (assuming you brick up the wall, so the only access to the grate is from directly above). Also note that you'll have issues if the river freezes over during winter. I don't know if freezing affects grates.