Datums for 8440452, PLUM ISLAND, MERRIMACK RIVER ENTRANCE MA


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8440452, PLUM ISLAND, MERRIMACK RIVER ENTRANCE, MA
Status: Accepted (Aug 27 2003)
Units: Feet
Control Station: 8440466 NEWBURYPORT, MERRIMACK RIVER, MA
T.M.: 75
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW8.70Mean Higher-High Water
MHW8.29Mean High Water
MTL4.29Mean Tide Level
MSL4.29Mean Sea Level
DTL4.35Mean Diurnal Tide Level
MLW0.29Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-4.47Station Datum
GT8.70Great Diurnal Range
MN8.00Mean Range of Tide
DHQ0.41Mean Diurnal High Water Inequality
DLQ0.30Mean Diurnal Low Water Inequality
HWI4.01Greenwich High Water Interval (in hours)
LWI10.23Greenwich Low Water Interval (in hours)
Max TideHighest Observed Tide
Max Tide Date & Time Highest Observed Tide Date & Time
Min TideLowest Observed Tide
Min Tide Date & Time Lowest Observed Tide Date & Time
HAT10.41Highest Astronomical Tide
HAT Date & Time05/17/1999 05:12HAT Date and Time
LAT-1.67Lowest Astronomical Tide
LAT Date & Time12/24/1999 23:42LAT Date and Time
Tidal Datum Analysis Periods
06/01/1989 - 09/30/1989




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