How to see low tide with tide gauge

Look at the fluctuation range of the curve, when is the lowest tide level and when is the highest tide level?

The tide table is displayed by coordinate chart, and the abscissa is 24 hours per day, which is generally represented by 0-6- 12- 18-0. The ordinate is the height of high tide and low tide every day, where 0 represents the altitude of the place. The calculated port tidal harmonic constant can be used to calculate the tidal time, tidal level and hourly tidal level of high tide and low tide in the port, and make a daily forecast table.

In the port where semidiurnal tide is dominant, the tidal characteristic values such as average high tide range, average high tide rise (average high tide of spring tide) and average low tide rise (average high tide of small tide) are usually listed. In ports dominated by diurnal tide, the tidal characteristic values of return tide and component tide are generally listed, which can be used to calculate the approximate tidal time and tide level of each port and understand the tidal characteristics of the port. In tide tables, charts and tables are usually attached for easy calculation, which are used to calculate the tide level at any time between high tide and low tide or at any time when any tide level appears when high tide and low tide are known. In addition, some tide tables are accompanied by the harmonic constants of the main tidal components in each port, or briefly introduce the tidal current in the nearby waters.