You might be thinking of 'fathom'. One fathom is six feet.
The term is impossible. A boat cannot float clear of the water.
The term for the depth of water needed for a specific purpose is often referred to as "water depth requirement" or "minimum water depth." This can vary based on the context, such as for navigation, aquatic life habitat, or construction purposes. In marine navigation, for instance, it may be called "draft," which indicates the minimum depth required for a vessel to float safely.
The term is draft.
The term is draft in American English, and draught in British England - both mean the depth of water beneath a boat.
The term is draft in American English, and draught in British England - both mean the depth of water beneath a boat.
The term is impossible. A boat cannot float clear of the water.
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.
Draft.
Draft.
Draft.
"Clearance" is one term.
The term you are referring to is "thermocline." It is the layer of water in the ocean where there is a rapid change in temperature with depth, serving as a barrier between warmer surface water and colder deep water.