Somebody crapped up my hydrodynamics education thread by saying that rivers will push water up to the river's original level through U-bends near their upstream ends even when there's available space at the downstream end.
I embarked on a 2x8 site with a stream and dug a U at the upstream end of the stream. The water travelled across 8 region tiles horizontally to go to the downstream end and avoid pathing up.
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Submitted by: Quietust - 2009-12-14
I know of only 2 things that will cause river water to traverse a U-bend up to its original level:
1. Damming the river downstream of the U-bend - it has nowhere else to go, so it goes thru the bend.
2. Pouring extra water onto the top of the river - pressure will push the water down, causing it to path through the U-bend.
Submitted by: Kami - 2009-12-15
As long as pathing will find any free space without water one z-level under the river - what is technically the case where the river leaves the site - pathing will not go up again to search for tiles on the same z-level as the river.