WHAT IS MEANT BY LIVERPOOL (ALFRED)?
The predictions in Laver s Liverpool Tide Table had until recently always been calculated using observed reference data collected many years ago at Princes Dock . The tide gauge was removed from Princes long ago and the main Mersey tide gauge is now at Alfred Dock, Birkenhead. Gradual changes in the global tidal regime, and to the river itself, have meant the old data no longer reflects actual conditions and so recordings from the new gauge must now be used. Together these changes have resulted in an average +10 minute shift in the time and +0.2 metres in the height of high water predictions.
