quote:
Originally posted by Chthon:
<STRONG>I had piped some water up from the outside river (this I now know is a bug in itself but oh well)</STRONG>
I don't see why it's a bug.
I have seen the ostensible explanation of why: water doesn't flow uphill.
But it's not even remotely clear to me why the channels that you dig from the river to the cliff are necessarily going "uphill".
The only thing that matters is the gradient of the channel's bottom.
Unless the rise in altitude from the river to the cliff face is large enough that it's simply infeasible to have the channel be the necessary depth at the cliff face, the "uphill" argument doesn't seem to make sense. And it's only, what, a couple dozen wagon lengths - let's say a football field - from the river to the cliff; there's no reason why this rise would necessarily be a significant issue.
And once you get to the cliff, height is no longer an issue at all. The dwarves can excavate into the cliff at any height they want. They could even excavate quickly downwards, below the level of the outside river. That would be a phenomenally bad idea, but they could do it.
More realistically, they could excavate such that the floor of their antechamber is several feet above river level, protecting against floods, but still allowing moats and such.