Been there, done that...with a Toyota Land-cruiser and a Citroen BX (can't find the pics right now, added a pic of a BX). Somewhere in 1998 I think, the Czech Republic had it's first catastrophic flooding in decades. With our Foundation, we send over two cars to help with carrying drinking water and food, etc. The Toyota could cross 20 inches but at least it had 4x4. The Citroen BX, a normal road car could cross only ...... 15 inches as well or even more.
The nice thing is, a BX has the famous Citroen hydraulic suspension and by a simple flick of a lever, you could raise the car a bit or to a full 8 inches in highest position to get more ground clearance. Not for long distances and you are literally driving without suspension, but it keeps your feet dry. When parked, it often gave them this strange view with the back wheels sitting much lower than the front.
Other item about the BX: the diesel version had the famous French (I know, its contradictory, but for once they got it right 200%) XUD 1.9 liter 4-cylinder diesel engine ranging from 55 to 100 HP. For a decade and more, undisputed the best diesel for private cars here. We put a BX diesel engine in my brother's boat, replacing an old 6 cylinder 6 liter ships diesel that was there earlier.