204 Ship Design for Efficiency and Economy

Table 6.17b Sea strengths for North Sea coupled to wind strengths, Henschke (1965)

				Approximate average
Sea scale	Bft	Sea description	Wave height [m]		Wavelength [m]
0	0	Smooth sea	Ð		Ð
1	1	Calm, rippling sea	0±0.5		0±10
2	2±3	Gentle sea	0.5±0.75		10±12.5
3	4	Light sea	0.75±1.25		12.5±22.5
4	5	Moderate sea	1.25±2.0		22.5±37.5
5	6	Rough sea	2.0±3.5		37.5±60.0
6	7	Very rough sea	3.5±6.0		60.0±105.0
7	8±9	High sea	>6.0		>105.0
8	10	Very high sea	up to 20		up to 600
9	11±12	Extremely heavy sea	up to 20		up to 600

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