EPSG
IHO Dictionary, S-32, 5th Edition, 2251.
2022-11-29
Hydrography and nautical charting.
The highest water level reached at a place in one tidal cycle. When used on inland (non-tidal) waters it is generally defined as a level which the daily mean water level exceeds less than 5% of the time.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "VerticalReferenceFrame", "name": "High Water", "scope": "Hydrography and nautical charting.", "area": "World.", "bbox": { "south_latitude": -90, "west_longitude": -180, "north_latitude": 90, "east_longitude": 180 }, "id": { "authority": "EPSG", "code": 1094 } }