I decided to do a mini-megaproject for my turn. Because we have 30+ dwarves in the infirmary with the plague, we're going to have a lot of deaths at some point in the future. To help cope with the resulting blow to morale, I decided that everyone needed to walk through a waterfall from time to time. I've set up some pumps inside the surface fortifications to bring water up two heisenburgs, which a sluice-way carries over to the central stairway and down into four vertical colums, evenly spaced around the interior portion of the stairwell. This should give a good distribution of soothing, calming mist that will dampen any future mood swings (hur hur).
Thank you, Samoorai, for letting me know that you wouldn't be starting right away. Without that, I wouldn't have been able to finish the waterfall. In fact, the dwarves had only just finished moving the excavated gems out of the drain, so it's only been running for a few game days, about 45 minutes or so. The water hasn't even reached the end of the drain.
In other respects the fortress progressed slowly but steadily along the lines set by my forebears. A fair number of new pumps have been installed in the pump tower (although I did not meet my goal of joining up the two sections), and walls have been built on every floor that has a pump so as to prevent leaks.
After dealing with the previous invasion by cunningly trapping the colossus in a cage, we were able to clear some of the litter from the surface. However, this didn't leave much labor for other, more important jobs, so much of it is still out there.
I sold the dwarven caravan animals, and bought gems, wood and stone blocks. We don't really need much of those, but it was a good opportunity to get rid of a bunch of caged animals, which is a good thing.
We're currently under siege. I attempted to drown a number of the goblins by flooding the entrance, only to discover that some idiot had built the outer bridge incorrectly, with the result that most of the water escaped into the open field, and nobody actually drowned. Someone will need to be flogged. Three or four of the goblins managed to get into the depot area just before the bridge there was raised, but we were waiting in readiness for such an occasion and dispatched them quite quickly. If it weren't for the bowgoblins out there, we would just march out and stomp all over them, rather than stay inside.