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[winner]

I've got this brook on my map that is 4 tiles wide, I'm thinking of pumping it up a level to go over my wall so I can flood enemies when they come, to make it so it don't just circle back under my wall waiting till it freezes and then building a wall across the channel

how many pumps to I have to use to raise a 4 tile wide brook two Z levels without it overflowing due to lack of flow?

[Istrian]

I don't understand what you are trying to do.

Are you trying to create a water reservoir above (or around) your brook ?
Are you trying to wall off the sides of the brook two Z-levels up and then raise the river ?

In the first case, you need one water pump per Z-level to pump water up.
In the second case, I'm afraid that's impossible because the brook will drain any water above it.

[winner]

layer 1

wwFwwwwwwXwwwww
wwFwwwwwwXwwwww
wwFwwwwwwXwwwww
wwFwwwwwwXwwwww

layer 2

wwXwwwwwwXXwwww
wwXwwwwwwPump
wwXwwwwwwXXwwww
wwXwwwwwwXwwwww

the water is flowing this way <-
F= floodgade
x= wall
w=water
pump is pumping <- way
clifs enclose the sides

I want to know if that is enough pumps