Any thoughts on contaminant and water issues? Are these the sort of things about which you have some fixes in mind, or will they likely take some more time to consider?
It's something I'm going to handle or at least address in some way during this cycle, but I haven't thought specifically about how I want to do it. The way the stagnant flag spreads is pretty crazy.
More interesting !!!SCIENCE!!! for my stagnant water bug
http://www.bay12games.com/dwarves/mantisbt/view.php?id=5232... at my new fort, I was able to make a (way too) small fresh water cistern which is refilled from a catchment system that drains murky pools. That was a single screw pump. I channeled out a much larger 3-z cistern fed by a pump stack of four screw pumps up from the same catchment basin. I recently had to cut down a tower cap that was growing in my third pump (LOL) and install floors in the water outlet/source squares on each level to prevent more mischievous plantlife. One, in particular, was painfully tricky and I ended up putting a tightly sealed door on the north face of the water outlet square. It just so happens that was for the first pump coming out of the stagnant water.
I turned on the pump stack and saw STAGNANT WATER 7/7 on that outlet square directly south of the door (I FREAKED!)...but, it turns out, the pump stack was still able to convert it to clean water on the next level and preserve the cistern (thank god).
Still not sure why that one square turned stagnant...but the other three screw pumps, with newly installed floors, were still able to clean the water.
This goes to my observation from the abandoned fort: When I built a screw pump inside a corridor of flooring and walls, it STILL put out stagnant water...maybe the work around is to have a pump stack (it's not like you don't have plenty of spare dwarves to crank the handles) of at least two or three pumps for any fresh-water-well-project you draw up. Sounds like a project I need to chase down in the interest of learning and !fun!.