Schlichting Shallow-Water Correction

Speed reduction for a given delivered power when a ship enters shallow water - Schlichting's 1934 correction.

ResistanceShallow water

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Formula, assumptions, and limits

\frac{V_\text{shallow}}{V_\text{deep}} \approx \tanh\sqrt{h/8T} \quad (h/T < 8)

Symbol	Meaning	Unit
$V_\text{deep}$	Deep-water speed at rated power	kn
$V_\text{shallow}$	Shallow-water speed at same power	kn
$h$	Water depth	m
$T$	Draft	m

Source: Schlichting (1934); ITTC 7.5-04-01 Shallow Water

Speed reduction for a given delivered power when a ship enters shallow water - Schlichting's 1934 correction.