Datums for 9455178, Northwest Passage


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9455178, Northwest Passage
Status: Superseded (Apr 17 2003) (Accepted Jun 15 2001)
Units: Feet
Control Station: 9455090 Seward, AK
T.M.: 135
Epoch: 1960-1978
Datum: MLLW
DatumValueDescription
MHHW10.77Mean Higher-High Water
MHW9.87Mean High Water
MTL5.61Mean Tide Level
MSL5.64Mean Sea Level
DTL5.38Mean Diurnal Tide Level
MLW1.34Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-28.04Station Datum
GT10.77Great Diurnal Range
MN8.53Mean Range of Tide
DHQ0.90Mean Diurnal High Water Inequality
DLQ1.34Mean Diurnal Low Water Inequality
HWI10.07Greenwich High Water Interval (in hours)
LWI3.86Greenwich 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
HATHighest Astronomical Tide
HAT Date & Time HAT Date and Time
LATLowest Astronomical Tide
LAT Date & Time LAT Date and Time
Tidal Datum Analysis Periods
08/01/2000 - 10/31/2000




Products available at 9455178 Northwest Passage,