1941-1942 DATA SUPPLIED BY AUTH. CODE 66
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Calais              190/011 RLR(1975) is 12.7m below BMNGFNAL3.44(1981)
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 21-Oct-1994
December 1990-November 1991 no data available
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 21-Nov-1994
1984-1991 data unavailable because of poor quality
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 09-Sep-1999
no observations since November 1995
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 06-Dec-2001
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
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 02-Feb-2011
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.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 29-Sep-2014
When downloaded from SONEL additional data points have been added for 1987-90. The whole dataset has been loaded to include these.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 21-Jun-2016
When loading the 2015 dataset it was noted that data points for September-November 2011 and February 2012 had been revised.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 15-Jul-2025
Updated the whole dataset to ensure they include all the historical data recovered recently by SHOM and the calculated monthly and annual means match those distributed by SONEL.

