What is the term for the depth of the water needed to float a boat clear of the bottom?

The term that refers to the depth of water required to float a boat clear of the bottom is known as "Draft." This measurement is crucial for navigation because it indicates how deep the hull of the boat extends below the waterline. A sufficient draft ensures that the vessel does not touch the bottom, which could result in grounding or damage.

The concept of draft is especially important when operating in shallow waters or when docking. Knowing the draft of a vessel allows sailors to plan their routes effectively and avoid areas where the water is too shallow for safe passage. Familiarity with draft is essential for crew members and captains to ensure that the vessel remains safe and operational.

Other terms like width, length, and height relate to different dimensions of a boat but do not describe the crucial aspect of how deep it sits in the water, making "Draft" the only correct answer for this question.