Not around here; not much. Mike Finkbeiner recently was hired by NYC to compare the 1811 sea level to now. His conclusion? High tide then was 4′ over mean low, 4.73 feet higher now.
In 1811 the Commissioner’s of the City of New York laid out the street grid system, and established an extensive series of elevation monuments at corner intersections, based on high tide of the era at zero. EarthImage was asked to calibrate that system in relation to the modern determination of tidal level and land elevations. Our conclusion was that the City Elevation Zero of 1811, now known as Manhattan Borough Datum, is 4.03 ft over modern mean lower low tide (the average daily low from 1978 to 2001.) As the daily high today is 4.73 ft higher than that, one can speculate that tides have risen 0.70 feet (8.4 inches) since 1811.
What’s going on (I say, not Finkbeiner) is that the gummint is changing the methodology to achieve its political goals. Here in Greenwich, Diane Fox, Katie Blankley Deluca (whose father is now on our BET) and Denise Savageu, the triad responsible for forcing residents from their homes, are only too willing to go along with that process.