Port accessibility is defined by the following characteristics:
- Maximum length of vessel which can be accommodated at the port (metres);
- Maximum draft of vessel which can be accommodated at the port (metres);
- Port approach width and depth above low water (metres);
- Entrance channel width and depth above low water (metres);
- Tidal window in hours for which vessels of maximum draft can enter and leave port;
- Height restrictions above high water (metres) (reflecting bridges);
- Tidal range (metres).