=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-Jun-1991
Knysna              430/086 RLR(1964) is 9.7m below BM SAN1
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 28-Aug-1996
For discussions of MSL changes and extreme sea levels around Namibia and South Africa, see: G.B.Brundrit, S.Afr.J.Mar.Sci.,16,9-17,1995 and S.Searson and G.B.Brundrit, S.Afr.J.of Science, 91,579-588,1995. 1960 - 1972 VALUES BASED ON 8 READINGS PER DAY
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 28-Nov-2006
Station flagged data generally suspect. Large spike in dataset Nov/Dec 2002 values very suspect.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 24-Sep-2009
Heights of chart datum relative to land levelling datum in South Africa and Namibia: Knysna Datum: up to 31st Dec 1978 = -0.625 Datum: 1st Jan 1979 - 31st Dec 1997 = -0.900 Datum: 1st Jan 1998 - 31st Dec 2002 = -1.048 Datum: 1st Jan 2003 onwards = -0.788 Datum is now LAT so unlikely to change.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-May-2010
There appears to be a spike in Nov/Dec 2002 see above. This is possibly real as it appears in several of the S. African stations.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 07-Nov-2019
The South African Navy Hydrographic Office (SANHO) are the copyright owners of the Knysna sea level data and must be contacted to request permission to use the data.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 10-Feb-2021
"The South African Hydrographic Office have asked us to remove this record in line with the Hydrographic Act of 2019 (Act No. 35 of 2019) and the South African Spatial Data Infrastructure Act, 2003 (Act No. 54 of 2003). The data can be obtained directly from SANHO (email: hydrosan@iafrica.com)