The study of the motion of sea-going vessels under the influence of waves, wind and currents, in order to determine the minimum depth required in port approaches and along offshore berthing structures for tankers and ore-carriers

When introducing a statistical consideration, for each possible depth of the fairway or berthing site of channels a probability or chance can be determined when it will be not safe for tankers of a certain size to make use of it. When comparing the losses due to these delays with the extra costs required for obtaining a greater depth, a decision can be made about the criterion to be adopted. In this paper the author's will confine themselves to the statistical and hydraulic aspects and discuss a method of deriving the relation between a certain depth and the risk of unsafely.