Recently, a new equation was developed on the basis of extensive research by Waterways Development to specifically target commercial waterways with vessel traffic and conditions representative of most major Canadian waterways. This equation takes into account the vessel beam in relation to the channel width, contrary to earlier equations that supposed infinite width. This new parameter is of importance since most Canadian waterways have limited width. The equation, known as Eryuzlu Equation # 3 (Ref.: 4, this reference is attached to this manual as Appendix 4), is therefore recommended as the one providing the most reliable results in waterways of limited dimensions. The equation is written as follows:
The equation is non-dimensional and therefore, can be used universally with any system of measurement units.
Fonte: Ship Design and Performance for Masters and Mates, C.B. Barrass.
Sendo assim, a baixa profundidade agrava os efeitos que levam ao afundamento do casco, o que pode obrigar a ser definido um limite superior para a velocidade na qual o navio irá operar quando houver uma restrição de fundo. (Juliana Barreiros, Escola Politécnica/USP)