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[Yaddy1]

How in the cheesing world do you dam a river that doesn't freeze?

[Yanlin]

Walls and drainage.

[Yaddy1]

please explain. My framerate is slowly dieing and I don't know how to do this.

[MC Dirty]

Or you could make an artificial cave-in. Or do constructions crumble to nothing if they fall down?

[Yaddy1]

I don't know!

[Jamini]

lots and lots of screw pumps.

[Yaddy1]

I'll try it... at least my migrant pump operator will be useful...

[Bralbaard]

If you have a magma pipe you could block the river with lava. We blocked a 46 square wide river that way in the Halltraded succesion game.

[Ivefan]

Construct pumps over the river with the output towards the river source. Connect the pumps to a waterwheel built on the same side as the output but remember to use a gearbox whith a lever so that you can turn it off.
Build walls so that the water do not overflow back into the riverbed that you intend to empty.

The way this works is that you pump the water back onto itself while building the dam. If the upstreams area is limited, like an underground river you might need to hurry because as soon as the pumps have filled the Z above the river they will stop working.

[Earthquake Damage]

I imagine this is the same as building on the ocean floor, only much easier.  Line the river with pumps on both sides, powered somehow (windmills?  waterwheels far upriver?).  Don't use single pumps.  Instead try a stair-stepping sequence of pumps to pump the water into a huge reservoir (alternately an enclosed channel that drains off the map edge), so it doesn't get in your way so much.  Once the water level near the pumps has been lowered, dig a ramp down one level, then build some flooring and a gearbox to mount the next row of pumps.  This should drop the river another Z level.  Repeat until you hit the riverbed, at which point you dam the river then slowly remove your pump system.

[Magua]

Or you could make an artificial cave-in. Or do constructions crumble to nothing if they fall down?

Constructions crumble to their component parts, which doesn't help.  Caveins are really only good for damming an undergroundriver.

[Viprince]

Or you could make an artificial cave-in. Or do constructions crumble to nothing if they fall down?

Constructions crumble to their component parts, which doesn't help.  Caveins are really only good for damming an undergroundriver.

Well I mean you could use freshly made obsidian but let's be honest if your gonna make obsidian over the river might as well use the magma to dam the river in the first place.

[Yaddy1]

I don't have magma...

[monzill]

I actually have a similar problem in my newest fort:

I was using natural lakes with a channel connected to the river to get my moat for mynewest creation, but my woodcutter went and got himself drowned at the one lake that has a direct connection to the moat (it nvolved taking the floor out from under him, literally).

So by only using 4 wood with at most 20 if I tear down my pallisade, and no stone thanks to an aquifier, how would I fix this issue (AKA get my only axe back).

Where's Urist MacGuyver when you need him?

[Ivefan]

He drowned in a one tile channel? construct a pump and connect it to a powersource after you've dug a stair next to the axe. as soon as the pump has emptied enough water fetch axe and remove pump