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0011688Dwarf FortressDwarf Mode -- Flowspublic2021-02-11 02:142021-02-11 02:30
0011688: Issue with water pressure
https://dffd.bay12games.com/file.php?id=15407 [^]

Water won't flow into the inverted U-bend and fill the well until one of a number of tiles is modified, such as the one marked for digging. If the drawbridge is closed (using the nearby lever named "Well Control",) water will stop flowing into the bend, even when the bridge is reopened. One of the special tiles must be modified again, such as by building an archery target on the dug out tile or by digging out a new one, for the water to flow through the bend again.

The tiles that need to be modified seem to be those in a grid-aligned 16x16 block containing the vertical intake shaft, as well as those horizontally adjacent (including diagonals) to the block. This is further restricted by the z-level of the bridge and the z-level of the river, both inclusive.
Create a small tunnel with a drawbridge in the middle. Create vertical shafts on both sides of the tunnel. Send water in through one side using a river (screw pump untested,) but close the drawbridge before the water has a chance to flow up the other shaft. Water will not flow up the other shaft when the bridge is reopened.
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Issue History
2021-02-11 02:14BumberNew Issue
2021-02-11 02:30BumberNote Added: 0040908
2021-03-12 17:46BumberNote Edited: 0040908bug_revision_view_page.php?bugnote_id=0040908#r16670
2021-03-12 17:49BumberNote Edited: 0040908bug_revision_view_page.php?bugnote_id=0040908#r16671

2021-02-11 02:30   
(edited on: 2021-03-12 17:49)
Looks like location plays a part in it. Water pressure updates fine in certain other blocks of the river. They share the same aquifer layers, so I'm not sure what the difference is, other than the one that worked was farther upstream.