There are better ways to measure how far underwater the car is: https://www.landrover.com/ownership/off-road/wading-depths.html https://www.landrover.com/owners

There are better ways to measure how far underwater the car is: https://www.landrover.com/ownership/off-road/wading-depths.html https://www.landrover.com/ownership/off-road/wading-depths.h..., this assumes you driving over something more or less flat underwater and that car is built for this. Here the goal is avoiding driving into the water in the first place.