Well, that was exciting. Just finished mopping up the basement. Torrential rain this evening caused the town’s sewers to back up. Which, in turn, caused water to pour into our basement — two to three centimetres’ worth, or about 1,100 litres (rough guess), which, thanks to some help from Ricky and his shopvac, we were able to vacuum up, bail out and mop up in only a couple of hours.
All in all quite lucky: everything on the floor down there was either in plastic containers or, if in cardboard, fairly low-priority stuff; damage so far appears to be light. Could have been much worse. Exhausted, though, now, so to bed with me.