Looks good. What are you planning to put on there for steps? What about the buoyancy of the pipe floating up?
As for the depth, I would guess the deepest step should be so the dog can basically swim right up onto the first step. So with that in mind consider that a dogs back is basically at the surface of the water when swimming. So I would guess the depth needs to be the height of the dog (floor to top of back) below the water line. Just a guess...
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