Elevations on Mean Lower Low Water
Station: 8771450, Galveston Pier 21, TX
Status: Accepted (Apr 17 2003)
Units: Feet
Control Station:
T.M.: 0
Epoch: 1983-2001
Datum: MLLW
| Datum | Value | Description |
| MHHW | 1.41 | Mean Higher-High Water |
| MHW | 1.32 | Mean High Water |
| MTL | 0.82 | Mean Tide Level |
| MSL | 0.83 | Mean Sea Level |
| DTL | 0.71 | Mean Diurnal Tide Level |
| MLW | 0.30 | Mean Low Water |
| MLLW | 0.00 | Mean Lower-Low Water |
| NAVD88 | 0.14 | North American Vertical Datum of 1988 |
| STND | -4.38 | Station Datum |
| GT | 1.41 | Great Diurnal Range |
| MN | 1.02 | Mean Range of Tide |
| DHQ | 0.09 | Mean Diurnal High Water Inequality |
| DLQ | 0.30 | Mean Diurnal Low Water Inequality |
| HWI | | Greenwich High Water Interval (in hours) |
| LWI | | Greenwich Low Water Interval (in hours) |
| Max Tide | 13.52 | Highest Observed Tide |
| Max Tide Date & Time | 09/08/1900 00:00 | Highest Observed Tide Date & Time |
| Min Tide | -6.28 | Lowest Observed Tide |
| Min Tide Date & Time | 01/11/1908 04:00 | Lowest Observed Tide Date & Time |
| HAT | 2.14 | Highest Astronomical Tide |
| HAT Date & Time | 10/17/1989 00:48 | HAT Date and Time |
| LAT | -1.19 | Lowest Astronomical Tide |
| LAT Date & Time | 12/31/1986 15:54 | LAT Date and Time |
| Tidal Datum Analysis Periods |
|---|
| 01/01/1997 - 12/31/2001 |
To refer water level heights to NAVD88 (North American Vertical Datum of 1988), apply the values located at
National Geodetic Survey.