Editing Old Dock (section)

==Old Dock Sill==
The level of the [[sill (dock)|sill]] of its entrance is used in and around Liverpool as a height [[datum (geodesy)|datum]] called Old Dock Sill or ODS.<ref>{{cite web|url=http://www.liv.ac.uk/climate/documents/Liverpool_-_Home_of_UK_Sea_Level_Science.pdf|title=Liverpool: Home of UK Sea Level Science (A century later – measurements resume)|work=University of Liverpool|access-date=5 July 2008}}</ref><ref>{{Cite web
  |title=A Study of Changes in High Water Levels and Tides at Liverpool during the Last Two Hundred and Thirty Years 
  |url=http://nora.nerc.ac.uk/3916/1/ir56.pdf
  |last=Woodworth  |first=Philip L. 
  |publisher=Proudman Oceanographic Laboratory
  |id=Report Number 56
  |year=1999
  |pages=3, 77
}}</ref>