Datums for 9454564, SEAL ISLAND


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9454564, SEAL ISLAND
Status: Superseded (Apr 17 2003) (Accepted Feb 12 1999)
Units: Feet
Control Station: 9454050 Cordova, AK
T.M.: 135
Epoch: 1960-1978
Datum: MLLW
DatumValueDescription
MHHW11.78Mean Higher-High Water
MHW10.86Mean High Water
MTL6.16Mean Tide Level
MSL6.28Mean Sea Level
DTL5.89Mean Diurnal Tide Level
MLW1.46Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND1.46Station Datum
GT11.78Great Diurnal Range
MN9.40Mean Range of Tide
DHQ0.93Mean Diurnal High Water Inequality
DLQ1.46Mean Diurnal Low Water Inequality
HWI10.06Greenwich High Water Interval (in hours)
LWI3.76Greenwich 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
HAT15.27Highest Astronomical Tide
HAT Date & Time11/24/2003 21:54HAT Date and Time
LAT-3.80Lowest Astronomical Tide
LAT Date & Time06/07/2039 16:36LAT Date and Time
Tidal Datum Analysis Periods
08/12/1998 - 10/30/1998




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