Thanks for the additional info Fish Bait.Most of Richmond's problem comes from the land sinking not the sea rising.
http://geogratis.gc.ca/api/en/nrcan-rncan/ess-sst/aff4fba4-e4b3-50c0-8e3c-c360a924487d.html
If you read the data from your post, it states:
1/"The land subsidence map is tied to regional sea level using a subset of collocated tide gauges and GPS stations. This analysis points to a regional Northeast Pacific sea-level rise of 1.8 mm/yr over the 20th century.",
2/ "The combined analysis shows an average subsidence rate in the Holocene delta (Richmond and Delta municipalities) of 1-2 mm/yr compared to uplift of 0-1 mm/yr in the Pleistocene Highlands (Vancouver, Burnaby, Surrey, Tsawwassen Heights).", and
3/ "Localized rapid subsidence areas (> 4 mm/yr) appear to be associated with sites of relatively recent construction."
So the actual observed relative rise in sea levels in certain areas could be upwards of 4mm/yr subsidence PLUS the 1.8mm/yr actual sea level rise = +6mm/yr observed sea level rise in areas.