Revised Local Reference (RLR) Diagram for HOLYHEAD

Station ID: 5

RLR diagram based on the information in the datum section below

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Datum information

Subtract 1.066m from data values 1938-1952 to refer to RLR
Subtract 1.089m from data values 1953-1959 to refer to RLR
Add 0.002m to data values 1960-1971 to refer to RLR
Add 3.763m to data values 1979 onwards to refer to RLR
RLR is 11.199m below primary benchmark SH 2553 8287