# Calculating secondary port tide times

Find the required locality in the table semidiurnal tidal planes or the table diurnal tidal planes and note its standard port.

#### Time of high water

- Note the time difference in column 1.
- Add or subtract (as indicated by + or -) this time difference to the predicted time of high water at the standard port.

#### Time of low water

- Note the time difference in column 2.
- Add or subtract (as indicated by + or -) this time difference to the predicted time of low water at the standard port.

The result is the approximate time of the tide at the required locality.

#### Height of high water

- Find the height of the predicted high water at the standard port.
- Multiply the height by the figure in column 9.
- Add or subtract (as indicated by the + or -) the figure in column 10.

#### Height of low water

- Find the height of the predicted low water at the standard port.
- Multiply the height by the figure in column 9.
- Add or subtract (as indicated by the + or -) the figure in column 10.

#### Example calculation

Find the time and height of high and low tide at a secondary place on the morning of March 16.

Example calculation#### Tide calculations between high and low water

## Contact us

You can contact us for more information on Queensland tides.