With auto insurance, each claim is unique. We do not have enough experience to say that driving into high water would be or would not be considered a flood. It is most likely not considered flooding of the vehicle, which is typically reserved for situations where a sitting vehicle is overtaken by water.
An individual claims adjuster would determine if it is a flood or not a flood. Your "other than collision" or comprehensive coverage should cover this incident, regardless of the designation as a flood.