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[golgepapaz]

 Well I am trying to build a canal for my dining hall using the surface brook (here is 1 z-level below the surface) as depicted in the picture below
and keep failing to accomplish it. Is there a way to fill the canal without flooding the dining hall short of building a embankment around it?
 Also can I feed the brook to itself ,if somehow dwarven fluid mechanics allows it of course, so I can have a running water?


Thanks in advance.

[greycat]

and keep failing to accomplish it. Is there a way to fill the canal without flooding the dining hall short of building a embankment around it?

The essential part is ensuring that there isn't any pressure causing the water to rise up above the desired level.  If you're letting water from the brook fall down a level (or more), then you should make it go through a diagonal opening on the bottom level, to remove the pressure.

[PatrikLundell]

Also note that floodgates are smashable by building destroyers, so drawbridges are a better choice. You can have circulating water to create waterfalls and whatnot by using a water wheel to power a screw pump (or screw pump stack). A water reactor (see wiki) is a perpetual motion machine for such a use.
Note, though, that running water has a negative effect on the FPS.

[Skorpion]

Don't link any sort of waterworks directly to the river. That is asking for trouble. Set up pumps for it instead, so you've got more control.

[FantasticDorf]

Don't link any sort of waterworks directly to the river. That is asking for trouble. Set up pumps for it instead, so you've got more control.

Pumps rise to the level that the pump is at for reference also (and if you are worried that building destroying creatures will come through the pump network, build a little area around the extraction point and establish a floor grate, which is invulnerable from the underside)

[golgepapaz]

So I've managed to bring the water in as shown below . First I've channeled the z-2
until near the river then dug two diagonal tiles as suggested by greycat and build a ramp where
the "x" is so i can channel the ceiling above (floor on z-1 "x"). After that I've channeled two tiles
on the surface diagonally>(z level) and behold now I have a stagnant ditch that goes nowhere.
(albeit my dining hall is relatively less humid)
 So how do I get a running water (screw pumps you say?) and take measures to prevent
an overzealous swamp thing/great white/pike snatch my dwarves frolicking around the canal.

Any blueprints and visual cues would be greatly appreciated..

[FantasticDorf]

If you would have waited, you could have installed a screw pump (B - M - first option, requires 1 block, a screw trap component and a pipe) in first, which would have pressurized the water down a directed path and been a 100% clean to drink (with only the slightest amount of mud, which can be fixed by making the ditch 2 z level deep)


Example.

Z level 1 - Water (W) comes in from the river/whereever into the extraction point (X) (~ stands for water and is more important for the second example, here it shows a 2 deep ditch that reaches to Z level 1, the water here should be lightly muddy, while the water above is clean, filling from the bottom to the top)

WWWX  ~~~~~~~

Z level 2 - Water is then drawn via the grate above the extraction point (G) and the screwpump that draws from the tile beneath and behind in the desired directions N/S/E/W , after being  hooked up to gears to activate the screwpump, or manually pumped by dwarves (easier setup, but requires access and allowances for dwarves to take eating/sleeping breaks) will pick it up and push it out to that level, the water should travel down the path you set up for it with good pace due to pressure.

G(SP) ~~~~~~~

Z level 3 - This is the z level your dining room is currently standing on with your dwarves looking down into your channel, the screw pump stops the water getting this high. As already suggested by other people on the thread, you might want to cover it up with something or install something nice over it. Grates allow dwarves to drink and clean themselves through it, but are destroyable from the top, not the bottom (grates can also be decorated to be fancy, experiment with stuff like glass i recommend, just as long as you dont mind things being broken)

I hope this simple diagram helps.