Datums for 8638660, PORTSMOUTH, NORFOLK NAVAL SHIPYARD VA


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8638660, PORTSMOUTH, NORFOLK NAVAL SHIPYARD, VA
Status: Accepted (Apr 29 2003)
Units: Feet
Control Station: 8638610 Sewells Point, VA
T.M.: 75
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW3.11Mean Higher-High Water
MHW2.90Mean High Water
MTL1.52Mean Tide Level
MSL1.53Mean Sea Level
DTL1.56Mean Diurnal Tide Level
MLW0.14Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD881.80North American Vertical Datum of 1988
STND-6.36Station Datum
GT3.10Great Diurnal Range
MN2.76Mean Range of Tide
DHQ0.21Mean Diurnal High Water Inequality
DLQ0.14Mean Diurnal Low Water Inequality
HWI1.69Greenwich High Water Interval (in hours)
LWI8.00Greenwich Low Water Interval (in hours)
Max Tide8.04Highest Observed Tide
Max Tide Date & Time09/18/1936 00:00Highest Observed Tide Date & Time
Min Tide-3.56Lowest Observed Tide
Min Tide Date & Time01/31/1966 00:00Lowest Observed Tide Date & Time
HAT4.13Highest Astronomical Tide
HAT Date & Time10/16/1993 14:18HAT Date and Time
LAT-0.80Lowest Astronomical Tide
LAT Date & Time02/09/1997 21:48LAT Date and Time
Tidal Datum Analysis Periods
01/01/1979 - 12/31/1986




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