Intercepting water instead of chasing it
Once water is past the entrance it is spread by every subsequent footstep across an area far larger than the door. So the effort goes at the threshold: matting that is actually absorbing rather than saturated, an absorbent run inside the door where the building allows it, and repeated attention to the first few metres. Mopping a lobby that is still receiving water is work that undoes itself within minutes.
Matting is the main tool and it is the one most often left to fail. A mat that is saturated is worse than no mat, because it holds water at the point of highest traffic and releases it onto shoes. Lifting it, replacing it if a spare is held, and drying the floor beneath is a specific task that has to be instructed rather than assumed.
