OK, I've tried a couple of different repeaters and I failed at both of them.
First off is the classic mist generator, with 4 pumps in a square above my fort entrance. I hooked it to a set of water wheels (not a DWR, just some WWs) with plenty of power, and it completely failed. The water got one pump away from the initial spot and spilled all over the place, and didn't stay around for the mist to generate.
Then I tried AncientEnemy's four tile repeater, (
http://df.magmawiki.com/index.php/40d:Repeater) which worked in 40d evidently...does it not work in 2010? I couldn't build a drawbridge, only a retracting bridge, and I don't think that functions for this particular repeater. Is something wrong with the way I'm doing things? Or have bridges changed since d40?