DYNAMIC DRAUGHT (SQUAT)
SAFETY MARGIN
Vessels sailing along main channels of principal routes are required to ensure at all times the following under keel clearance: 
a) Draught less or equal to 10.36m (34 feet): 0.60m.
b) Draught equal or greater of 10.37m (34 feet) until 10.67m (35 feet): 0.60m + 1.5 cm per additional cm of draught.
c) Draught equal or greater than 10.68m (35 feet): 10% of static draught.