Hypothetically - if the extreme rains and weather continues, would fitting a snorkel be sufficient to allow my ICE car to ford deeper water (assuming that the road is intact of course). I am considering normal road cars - not 4x4s. My consideration is based on some of the videos of people drowning their cars at river fordings in the UK, where the river has gone beyond its banks. I am aware that part of the issue is entering the water too fast, and causing a wave that will reach the air intake, flooding the engine.
My worry is that the water will ingress through the exhaust, essentially rendering the snorkel ineffective.
The idea here is flooded roads. Not rivers, not streams, but roadways that have (lets say) 45-60cm of standing water. If I could not take a detour, I would go slow, through the water, and ensure that I have some sort of mark to indicate to me if the level should approach the level of the air intake.
The reason for posting the question regarding the snorkel, was that it is a relatively easy modification to make to the car. I probably wouldn't do it to my daily driver, since that would ruin its aerodynamics.
My thought was that the clearance was not an issue (as long as there is no debris that has been swept onto the asphalt).
I guess that part of my answer is that you can get kits to fit a snorkel on some of the lower Subarus, and they are in the same size and situation as a regular car.
I guess @JonCuster's comment about the exhaust displacing the water is a good point. I will have to go do some 4x4ing to learn more.