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Status: Superseded (Apr 17 2003) (Accepted Feb 4 1994)
Units: Feet
Control Station:
T.M.: 75
Epoch: 1960-1978
Datum: MLLW
DatumValueDescription
MHHW3.15Mean Higher-High Water
MHW2.94Mean High Water
MTL1.54Mean Tide Level
MSL1.55Mean Sea Level
DTL1.57Mean Diurnal Tide Level
MLW0.14Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-6.01Station Datum
GT3.15Great Diurnal Range
MN2.80Mean Range of Tide
DHQ0.21Mean Diurnal High Water Inequality
DLQ0.14Mean Diurnal Low Water Inequality
HWI1.75Greenwich High Water Interval (in hours)
LWI8.07Greenwich Low Water Interval (in hours)
Max Tide8.39Highest Observed Tide
Max Tide Date & Time09/18/1936 00:00Highest Observed Tide Date & Time
Min Tide-3.21Lowest Observed Tide
Min Tide Date & Time01/31/1966 00:00Lowest Observed Tide Date & Time
HAT3.99Highest Astronomical Tide
HAT Date & Time10/08/2006 14:42HAT Date and Time
LAT-0.71Lowest Astronomical Tide
LAT Date & Time02/01/2014 09:00LAT Date and Time
Tidal Datum Analysis Periods




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