When we had the floods in September 2013 our kitchen drain worked in reverse. As did the shower outlets.
That must have been a nightmare. All of that wastewater flowing back into the house.
Indoor drains are tricky. Drains work on gravity, so floor drains have to be in somewhat elevated rooms (at least in relation to the discharge, into a septic field or drain), and then a whole room that drains has to be watertight, or else you're talking mold and structural damage from leaks.
I'm not a plumber, but I've owned some interesting homes, and I watch a lot of TV.
I'll show you my buttcrack if necessary.