Portuguese to English Tech/Engineering Ships, Sailing, Maritime

O nome do navio, porto de registro, marcas de calado e de borda livre, divisões entre tanques e
compartimentos (nos chapeamentos do convés principal, costado, fundo vertical e fundo chato) (...)

in http://www.aquaviarios.com/index.php

as flato bottom

and "Fundo vertical" - I couldn;t find any translation of the term