Datums for 8459338, Block Island RI


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8459338, Block Island, RI
Status: Superseded (Apr 17 2003) (Accepted Feb 4 1994)
Units: Feet
Control Station:
T.M.: 75
Epoch: 1960-1978
Datum: MLLW
DatumValueDescription
MHHW3.28Mean Higher-High Water
MHW3.02Mean High Water
MTL1.57Mean Tide Level
MSL1.49Mean Sea Level
DTL1.64Mean Diurnal Tide Level
MLW0.12Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-0.80Station Datum
GT3.28Great Diurnal Range
MN2.90Mean Range of Tide
DHQ0.26Mean Diurnal High Water Inequality
DLQ0.12Mean Diurnal Low Water Inequality
HWI0.08Greenwich High Water Interval (in hours)
LWI6.17Greenwich Low Water Interval (in hours)
Max Tide5.38Highest Observed Tide
Max Tide Date & Time10/22/1988 04:18Highest Observed Tide Date & Time
Min Tide-1.96Lowest Observed Tide
Min Tide Date & Time02/09/1989 15:30Lowest Observed Tide Date & Time
HAT4.38Highest Astronomical Tide
HAT Date & Time10/27/2011 12:18HAT Date and Time
LAT-0.96Lowest Astronomical Tide
LAT Date & Time02/12/2032 19:24LAT Date and Time
Tidal Datum Analysis Periods




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