As long as water doesn't end up in your computer or in your air intake you can drive a car in as deep of water as you want. You must be a city slicker if you don't think flooding is something that needs to be taken into account.

Tell me how well an electric boat would work that ships goods across the ocean. I'll give you a hint, it wouldn't work for shit. I've spent my entire life working on the ocean so I think I would know a little about the subject. Electric is a joke and it will never replace the combustion engine.