Datums for 9454153, GRAVINA RIVER


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9454153, GRAVINA RIVER
Status: Accepted (Apr 11 2023)
Units: Feet
Control Station: 9454240 Valdez, AK
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
DatumValueDescription
MHHW12.04Mean Higher-High Water
MHW11.12Mean High Water
MTL6.31Mean Tide Level
MSL6.43Mean Sea Level
DTL6.02Mean Diurnal Tide Level
MLW1.50Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD880.80North American Vertical Datum of 1988
STND-17.63Station Datum
GT12.04Great Diurnal Range
MN9.62Mean Range of Tide
DHQ0.92Mean Diurnal High Water Inequality
DLQ1.50Mean Diurnal Low Water Inequality
HWI10.00Greenwich High Water Interval (in hours)
LWI3.69Greenwich 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
HAT15.54Highest Astronomical Tide
HAT Date & Time11/24/2003 21:48HAT Date and Time
LAT-3.69Lowest Astronomical Tide
LAT Date & Time05/27/2021 16:42LAT Date and Time
Tidal Datum Analysis Periods
05/01/2022 - 07/31/2022




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