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[Zantan]

I was just making a system that blocked off a passageway with water.  It drained water from an underground river, into a room in an old tower cap farm.  From there, water would flow down a set of ramps to fill a passage.  The water could be pumped out of the passage into the tower cap farm to make the passage passable again.

The second time I filled it from the underground river, I closed the floodgates late, and found that the lower passageway, and the room which was filled by the underground river were both filled with 7/7 water, but water was not flowing up the other side of the ramps, or up the open space next to the pumps, even though it was on the same z level as 7/7 water.  However, when I opened the floodgates again, and there was water flowing in from one z level up, water began to flow up the ramps and up the open space.  Is this supposed to happen?

Here is a quick representation of the setup:

Code: [Select]

z=-5 Underground River
z=-6 Tower Cap Farm     Ramps  pump     Ramps [Passage]         
z=-7                    Ramps [passage] Ramps


[Christes]

It's not entirely clear to me what is going on, but one shortcoming if the DF pressure system are cases like this:

From the side:
W- wall
~ - water
. - open space

Code: [Select]

WWWWWWWWWW
~~~W......
WW~W~WWWWW
WW~W~WWWWW
WW~W~WWWWW
WW~~~WWWWW
The water will not flow up.  If it is pressurized from z-level n, it will only go up to z-level n-1.

[Quietust]

The water will not flow up.  If it is pressurized from z-level n, it will only go up to z-level n-1.

That only happens if the water source is a river which is allowed to drain naturally (or if it's a tank of water 1 Z-level deep) - if you use a dammed river or a screw pump, it will fill all the way up to the source level.

[Firnagzen]

As to why...

Water preferentially paths down, sideways and then up, in that order. So river water would rather path along the z level to the drain than fill up that last section.

For further hydrodynamics education...

http://www.bay12games.com/forum/index.php?topic=32453.0

[denito]

- if you use a dammed river or a screw pump, it will fill all the way up to the source level.

There's no need to curse.