I am trying to drain a river but can't remember how I did it last time. I seem to recall it was possible to do so by pumping from each tile across into a cistern of sorts that didn't drain. I tried like this before
WWWWW
W~~~~W
W====W
W . . . . W
WWWWW
W = wall
~ = river
= = screw pump
. = floor
but it seemed to only go until the floor was filled to 7/7. So either my previous successful attempt was bugged out or it is a matter of needing to extend the floor tiles south because of how screw pumps work. Any help would be greatly appreciated.
Your description is a little confusing. But it sounds like you were draining the river into a cistern, and that cistern never got full the last time but this time it did.
That's a bug I've seen near oceans. I'm guessing this time you are far inland.
Must have been something like that, I routed the water underground and drained it off the map and it finally worked.
On another if I mod a bird to have dive hunts vermin post world gen will that work? or would I need to regen the world. I embarked on a region that can have peregrine falcons but doesn't seem to, it does have other predatory birds. I am trying to avoid almost any free tame animals.
@samanato: I don't think there is a set figure for how long rain will last even within a biome type. I have had embarks where it rained basically all year round and in the same biome type where it rains in a much more normal manner.