Definitions
Draught, normal (T)
The depth of water needed to float the boat, when it's loaded to its design displacement and sitting on its design waterline.
Draught, minimum (Tmin)
In a boat with retractable appendages (rudder, daggerboards, outboard or sterndrive engine), the depth needed to float the boat when all these appendages are fully retracted. Again, this measurement is based on the design waterline.
Units: Linear measure (usually metres/centimetres or feet/inches).
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