Water density readings

The tables below show observed water density readings held by the Port of London Authority (PLA) and are provided to serve as a guide only for water densities that may be encountered on the Thames.

The PLA accepts no responsibility as to their accuracy.

Density measurements vary temporally throughout the day and year and are significantly affected by local variations in salinity and temperature.

It is recommended that for density values to be used for draft or freshwater allowance calculations, that in situ measurements taken at the location of the vessel or terminal.