40d Talk:Water flow

I tested running water wheels with sourced water from an underground river waterfall. The pressure of downstream the waterfall pushed the water up to one z-level below the river connection.

I connected a dead end water wheel room to it and the wheels sporadicaly moved one or two times and then stopped. Tried vertical and horizontal placement. No movement. Then I opened up the other side of the room and the water was "moving" through the room but the water wheels still did not work.

I suggest adding this information to the wiki entry for water flow. That water pushed up z-levels by downstream waterfall pressure does NOT behave like the sourced water described so far. Please note that these are just my tests and my experiences with version 40d11, if you have different results or further information please feel free to correct me. August 3, 2009 User:SpaceTurtle

This article needs to be checked over for accuracy, changed from the 1st person to something less "chatty", and have more links both to and from. Also maybe a category, "FAQ" or something?--Albedo 21:52, 3 August 2009 (UTC)

I just wanted to comment on the article. english is not my first language, so this isn't a finished draft for the wiki entry.

Just wanted to supply some information to be added to the entry if it somebody finds it useful. --SpaceTurtle 7:40, 4 Auguest 2009 (UTC)

I think albedo is not referring to your edits above, but to the main article :) --Höhlenschreck 20:27, 4 August 2009 (UTC)

Channeling moving water

Creating water flow seems to be (semi-)reliably created where a channel is dug from a brook or river, back to the same brook or river with no diagonal connections. For example #1 will create flow, while #2 will not and #3 may or may not.

    ≈  River or Brook
    ~  Channel 
#1     
     ≈~~~    
     ≈  ~  Flow
     ≈  ~
     ≈~~~

#2
     ≈~~~
     ≈   ~ No flow (due to diagonals)
     ≈   ~
     ≈~~~

#3
     ≈~~~
     ≈  ~~~ Possible flow (not perfectly understood)
     ≈  ~~~
     ≈~~~

This is simply incorrect. Water from a natural source certainly can retain it's flow through diagonal steps. I've ran two tests to confirm this. If someone can point me to a place I can post videos, I have one of these tests saved and would like to post it so others can see. Doctorzuber 17:05, 18 March 2010 (UTC)

As for wild theorizing, if you're using diagonal steps on a river, odds are you're also dropping that river one or more z-levels. and I have certainly observed some weirdness with natural flow and z-level changes. My theory on this matter is the observation that only the top level or a river actually flows, if you channel it down several levels, the lower levels do not flow. So if you're dropping a river one or more levels and pulling it through diagonals to prevent pressure, you're also not going to have flow because only the top level of the river was ever actually flowing to begin with. However I do need to run more tests on this subject before saying anything for certain since I have observed other weirdness with z-level changes in water including once case where for some inexplicable reason water was flowing on the bottom level of my cistern which was quite perplexing since nothing here was actually moving, no pumps were running, the bottom level had three full levels of water above it, so nothing could possibly be moving, and yet it showed flow. Water in DF does wonky things. Doctorzuber 17:12, 18 March 2010 (UTC)

Inconsistency with a U-Bend from a brook.

I cut out a small area near a brook going down two z-levels so that I would have a small u-bend, one level below the brook. Once this was constructed I channeled the last piece to connect this to the brook. I was looking to see if water flow would be conserved across the u-bend. what I discovered instead was that the brook apparently has no pressure at all. The brook failed to push the water back up the other side of the u-bend behaving much like you might expect from magma.

    ≈  River or Brook
    ~  Channel
    .  Open Space
  
     ≈Z-0 ≈≈≈~~ . 
     ≈Z-1     ~~~ 

Following this test, I repeated it but this time with a floodgate in the low point of the u-bend since in the past I've observed that floodgates can reset the pressure if you turn them on and off. I toggled the floodgate open and closed a few time, but no change in pressure. The result was the same. Finally, later I used screw pumps to put a layer one z-level above the flowing channel, which finally reset the pressure pushing the water up the far side of the u-bend. Just more wonky behavior from water.Doctorzuber 01:21, 19 March 2010 (UTC)

This seems completely consistent with current observed behavior of water pressure - unless you dam the brook, water going through a U-bend will only rise to 1 Z-level below the original level. --Quietust 02:45, 19 March 2010 (UTC)

≈≈≈~~ .
    ~ ~
    ~~~

CPU usage

Maximizing framerate says "Magma and (to a lesser extent) running water are CPU hogs". Should that be mentioned here? --HebaruSan 00:24, 8 November 2009 (UTC)