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[BlackPhantom]

so basically, I dug two vertical tunnels a couple of z-levels down, connected them at the bottom, and connected one at the top with a brook. When looking at it from the side, it looks like a U.

The problem is...the water goes down all the levels, traverses the connecting tunnel at the lowest level, but doesn't rise back up the second vertical tunnel.

And ideas?

[Draco18s]

Water will not come back up to the same level as the source, it will only rise to one level below the source, and is intended.

[eerr]

unless you pressurize the water  of course.

magma won't rise ever, unless you also pressurize it.

[Draco18s]

unless you pressurize the water  of course.

magma won't rise ever, unless you also pressurize it.

There are 2 things wrong with this statement:

1) Water that falls down a hole is under pressure, due to the nature of the water on top of it.
2) Magma does not obey pressure, thus, never fills a u-bend.

This is intended, and happens, and I'm sure is what the OP is reporting:

~~~#_..  <-- water is not rising through the channel.
##~#~##
##~#~##
##~#~##
##~~~##
#######


Magma, in the same conditions:


~~~#_..
##~#_##
##~#_##
##~#_##  <--magma will never rise to here, even if there's a pump at the other end (upper left, relative to this view)
##~~~##
#######

[Quietust]

Magma, in the same conditions:


~~~#_..
##~#_##
##~#_##
##~#_##  <--magma will never rise to here, even if there's a pump at the other end (upper left, relative to this view)
##~~~##
#######

Actually, that's wrong - if you have a pump at the other end, the magma will rise all the way up to the initial level. I know because I took advantage of this behavior to fill a 23 Z-level hollow pyramid with magma from the bottom (see here).

To summarize:

Water, naturally flowing:

~~~#_..
##~#~##
##~#~##
##~#~##
##~~~##
#######

Magma, naturally flowing:

~~~#_..
##~#_##
##~#_##
##~#_##
##~~~##
#######


Water or magma, pumped:

.%%~#~~~
~##~#~##
###~#~##
###~#~##
###~~~##
########

[Draco18s]

Interesting.  I was sure I understood the flow mechanics correctly, but I guess not.

Anyway, magma getting pressure from pumps is likely a bug, as I know Toady didn't want magma rising back up at all, hence [CHUNKY].

[BlackPhantom]

This is what happened:

~~~#_..
##~#_##
##~#_##
##~#_##  <--water will not enter this level
##~~~##
#######

so it's basically behaving like magma
...except that it's water...lol

[Derakon]

What does the bottom level of your system look like? If the water ever passes through a diagonal, like this:

Code: [Select]

##.##
##.##
###..
#####then it becomes depressurized and will not rise up.

[BlackPhantom]

nothing diagonal...just like I indicated in the drawing

[Quietust]

Does the U-bend pass through a Z-level containing an aquifer (or sea level, if you're near an ocean)? Some rather odd behavior's been observed with those recently.

[BlackPhantom]

not that I know of...

[Quietust]

Post a save file to DFFD - if there's something odd going on, someone's bound to figure it out.

[eerr]

were the tunnels perfectly straight down and up?

[BlackPhantom]

yes...the tunnels were perfectly straight
where can I upload the file?

[Quietust]

where can I upload the file?

Allow me to quote part of the Bug Reports forum header:

When posting:
    * Choose a descriptive thread title that includes the DF version number.
    * If you have a save that reliably reproduces the bug, it may be helpful to upload the save to the DF File Depot or another file hosting site.

Not to be rude, but those are there for a reason.