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[Shad0wyone]

Alright, I successfully dammed my river a while ago, as shown here.
Note: You NEED a waterfall, either a natural one, or an artificial one caused by collapsing.
Here it is, note the width doesn't matter.
+ is constructed floor X is floodgate R is river _ is open space
First step:

Code: [Select]

RRR_+
RRR_+
RRR_+Construct a row of floors with an open space between the floors and the river.
Second step:

Code: [Select]

RRR_X
RRR_X
RRR_XConstruct floodgates on top of the floors.
Third step:

Code: [Select]

RRR+X
RRR_X
RRR+XConstruct floors, leaving one spot open, your dwarves won't construct it, because of the water.
Now, you have to build a pump pumping water out of that spot there, so your dwarves will build the floor.
Then all you do is construct the final floor, and the river is dammed!
Please note that this does work, but you may have to tweak the design a bit, don't blame me if you have fun, and remember, water doesn't go over floodgates.

[Rockphed]

Instead of building a line of floors after you build the floodgates, why don't you build a bridge first, retract it, then build the floors under the floodgates, build the floodgates, then, finally, put the bridge back.

[zchris13]

This here is quality.  Real quality.

[Shad0wyone]

Instead of building a line of floors after you build the floodgates, why don't you build a bridge first, retract it, then build the floors under the floodgates, build the floodgates, then, finally, put the bridge back.

That might work, but floors built from bridges that aren't connected to a wall just fall down, so it would require a bit of micromanagement. Besides, this is Dwarf Fortress, things are SUPPOSED to be overcomplicated and liable to not work, kill your dwarves, and/or kill elves. (There is more fun when all three happen)

[Fossaman]

The bridge method really is simplest. Just build the floors  before adding the bridge, and the dwarfs will do it sans micromanagement.

[Shad0wyone]

Meh.
I wish I thought of that when I built it...

[Nightwind]

could somebody spend a minute dumbing this down?

you build 2 tiles over from the waterfall, in the air above the river, floor, then again above the river, to the right, floodgates, and then more on the floor you just made, but it somehow blocks a river one z level down?

[Vanguard Warden]

I'm not quite sure I understand the idea, need to re-read it, but I was just looking for a way to seal off the chasm at the end of my underground river to divert the flow. I was hoping to do it without having to use pumps and dig elaborate power sourcing, though.

[Rockphed]

What you want to do is actually incredibly easy.  Undoing it is the hard part.

First, dig out enough space so that you can build a bridge to cover the chasm completely.  The bridge should be oriented so that the only part that is actually accessible is right next to a door.  I'll try to make some pictures in DF later.  Then just build a bridge over the hole and build your diversion.