Definitions for "TIDAL RANGE"
See RANGE OF TIDE.
The vertical distance (height or amplitude) between sea level at low-water and sea level at high-water during a single tide.  The maximum range of spring tides at Southport is approximately 10 metres and the minimum range of neap tides is approximately 4.5 metres.
the difference in height between the rise and fall of the water level at the tides