Datums for 8770777, Manchester TX


NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 8770777, Manchester, TX
Status: Superseded (Apr 17 2003) (Accepted Jul 30 1999)
Units: Feet
Control Station: 8770613 Morgans Point, Barbours Cut, TX
T.M.: 0
Epoch: SPECIAL
Datum: MLLW
DatumValueDescription
MHHW1.62Mean Higher-High Water
MHW1.48Mean High Water
MTL0.86Mean Tide Level
MSL0.89Mean Sea Level
DTL0.81Mean Diurnal Tide Level
MLW0.25Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-5.64Station Datum
GT1.62Great Diurnal Range
MN1.22Mean Range of Tide
DHQ0.14Mean Diurnal High Water Inequality
DLQ0.25Mean Diurnal Low Water Inequality
HWIGreenwich High Water Interval (in hours)
LWIGreenwich Low Water Interval (in hours)
Max Tide11.95Highest Observed Tide
Max Tide Date & Time08/29/2017 09:36Highest Observed Tide Date & Time
Min Tide-3.36Lowest Observed Tide
Min Tide Date & Time03/09/1998 19:18Lowest Observed Tide Date & Time
HAT2.36Highest Astronomical Tide
HAT Date & Time10/10/2025 05:48HAT Date and Time
LAT-1.41Lowest Astronomical Tide
LAT Date & Time01/10/2005 20:42LAT Date and Time
Tidal Datum Analysis Periods
01/01/1998 - 12/31/1998




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