Sorry, Rob, but a dike is very different from a dyke.
Not in a flood!
But anyway, whether using U.S. or U.K. spellings, they can be the same thing to the pure of heart and mind. I think I almost made that category at one time. Pure of heart and mind, I mean, not the other, obviously, in either language. Did you know that there was this heroic little boy in the Low Countries who reputedly (if not repeatedly), stuck his finger into one of them and saved a grateful country from disaster? Little boys can get away with murder, as I seem to remember.