What would happen if you kept adding water to the earth?
As a hypothetical, say it became easy to grab water from objects in space and then move it places that needed (Africa / the gulf). What would the end results be for the global climate over time? Would you just end up with a flooded earth? Would temperatures rise or fall as time goes on?
Within our solar system, these two moons carry a lot of water. Both very cool planetary objects, but not one of them is overflowing like in your imagined planet. We can't really study planets outside of our own neighborhood in high (enough?) detail yet, so this is it for now :P