Swell Conditions

Wave Size	Height (metres)	Effect
Flat	0-0.1m	No waves breaking on beach
Small	0.1-0.5m	Slight waves breaking on beach
Medium	0.5-1.25m	Waves rock buoys and small craft
Large	1.25-2.5m	Sea becoming furrowed
X-Large	2.5m+	Sea deeply furrowed