North Point, HK 611/011 RLR(1975) is 11.2m below Rifleman's Bolt
Documentation added 1999-12-03
According to Dr.Baki Iz (Hong Kong Polytechnic University) reference benchmarks at the North Point and Quarry Bay gauges show from episodic levelling significant settlement with respect to neighbouring marks (October 1998). However, data provided for these sites are conventionally referred to the more stable Principal Datum and Rifleman's Bolt benchmark by means of frequent levelling. Note that the North Point and Quarry Bay datums are the same and their RLR time series may be combined to make one continuous record if wished with reasonable confidence.
Documentation added 2002-01-09
For an analysis of sea level changes in Hong Kong, see "Sea level changes in Hong Kong from tide gauge measurements" by X.Ding et al., Journal of Geodesy, 74, 683-689, 2001 and "Long-term sea-level changes in Hong Kong from tide-gauge records" by X.Ding et al., Journal of Coastal Research, 17, 749-754, 2001. 1929-1930 Gauge sited at 22 17 N 114 13 E 1949 Gauge installed at Aresenal Yard on 26th October 1952 Gauge transferred to North Point on 23rd October Replaced by Quarry Bay (611/010) after 1985
Port Works Division 4 - 5/f, Civil Engineering Building 101 Princess Margaret Road Homantin Kowloon