The distance from the surface of the water to the lowest point of the boat: How much depth of water does the boat need not to touch the bottom.
a boat draft
that is where the water level is when the boat is in the water.
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 distance between the bottom and the keel of a boat is the draught (British English).
To calculate the draft of a boat, measure the vertical distance from the waterline to the bottom of the hull (keel) when the boat is in the water. This measurement can be taken using a sounding line or by checking the boat's specifications if available. The draft can vary based on factors like load and water conditions, so it's important to take measurements under typical operating conditions. Additionally, ensure that the boat is level, as an uneven load can affect the 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.
It is the boat's draft.
Draft.