Calais 190/011 RLR(1975) is 12.7m below BMNGFNAL3.44(1981)
Documentation added 1994-10-21
December 1990-November 1991 no data available
Documentation added 1994-11-21
1984-1991 data unavailable because of poor quality
Documentation added 1999-09-09
no observations since November 1995
Documentation added 2001-12-06
Calais new acoustic gauge installed 8/11/1998 at 5058N 00152E (prev. 00151E). Acoustic gauge replaced by radar (Krohne BM70)gauge 23/4/2001. RLR redefined 6/12/2001 to different (more stable) benchmark. Calais RLR(1975) is 12.51m below BM NA L3.43a
Documentation added 2011-02-02
From information on the SHOM and SONEL websites the RLR diagram for Calais has been updated. Primary benchmark is now N.A.L.3 - 159. Datum remains the same so RLR unchanged.
Documentation added 2014-09-29
When downloaded from SONEL additional data points have been added for 1987-90. The whole dataset has been loaded to include these.
Documentation added 2016-06-21
When loading the 2015 dataset it was noted that data points for September-November 2011 and February 2012 had been revised.