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[Ultrudeus]

So here is my question. Bellow is a crude map from the side as accurate as I could make it.
Z-5 is a river a ways off that I channeled over my fort.
Z-4 and Z-5 are the my fort.
Z-1 is the lowest mined area on the map.
A breach occurred over Z-4.
Everything from Z-1 to Z-4 is filled with water to a level of 7.Why doesn't the rest of Z-5 fill up? Since the river has a level of 7 there should be positive pressure pushing the water up right? But there is none. Am I missing something?

   River
     v               _______  _____
5 =====_____|  ___________|
4   | _____________|       <--Fort
3   ||<--Shaft
2   ||_____
1   |______|<--Fort Basement

[Razoric480]

Wiki on Hydrostatic pressure in DF

In particular:

Note that DF water pressure does not exactly match natural hydrostatic water pressure - it fills to a z-level one level lower than the source. (This is for reasons of CPU time-saving, as stated by Toady), the game stops not when all ends of the system are on the same level, but the far levels are one-lower than the source.)

[Ultrudeus]

Wiki on Hydrostatic pressure in DF

In particular:

Note that DF water pressure does not exactly match natural hydrostatic water pressure - it fills to a z-level one level lower than the source. (This is for reasons of CPU time-saving, as stated by Toady), the game stops not when all ends of the system are on the same level, but the far levels are one-lower than the source.)

Thanks, I don't know how I missed that. I guess playing for a good 14 hours straight on only 4 hours of sleep can make me skip over things....
 

[Quietust]

Note that if you had dammed the river, then the water would have filled up the rest of Z-5 - the only reason it doesn't fill up is because the water prefers to drain off the edge of the map.