Three pieces, ordered the way the year unfolds here: the machine to sort out in winter, the checklist for late February, and the room-by-room account of what survives if the spring goes badly anyway.
The three
Why these three and not the usual ones
Each exists because of something specific about this metro. The sump pump piece comes first because here the pump is not an accessory; it is the appliance a finished basement depends on, and the decision about an aging one is worth making in the quiet months rather than during a wet week. The melt checklist exists because this is one of the few places where basement flooding publishes a schedule, which makes an hour of preparation unusually valuable. And the salvage guide exists because the finished lower level raises the stakes of every water event: the useful question is rarely whether there was damage, but how much of the room can stay.
If it is happening now
These are for reading ahead, not for an emergency. If there is water downstairs at this moment, the useful page is emergency water removal, which covers the order things need to happen in.