The term is draft.
The term for the depth of water needed to float a boat clear of the water is called the "draft" of the boat.
The term is impossible. A boat cannot float clear of the water.
Draft
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draft
It is the boat's draft.
It is the boat's draft.
It is the boat's draft.
It is the boat's draft.
The term you are referring to is "draft". The draft of a boat is the depth of water needed for it to float clear of the bottom.
The term for the depth of the water needed to float a boat clear of the bottom is called "draft." It refers to the distance between the waterline and the deepest part of the boat below the water's surface.
It is the boat's draft.