Schlichting Shallow-Water Correction
Speed reduction for a given delivered power when a ship enters shallow water - Schlichting's 1934 correction.
Shallow-water speed (same power)
6.83kn
Speed loss
51.2%
Formula, assumptions, and limits
Simplified Schlichting correction valid for h/T < 8. Beyond that, shallow-water losses are negligible. Full Schlichting chart also includes the wave-resistance increment driven by Fn_h = V/√(g·h).
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Deep-water speed at rated power | kn | sea trial | |
| Shallow-water speed at same power | kn | result | |
| Water depth | m | chart | |
| Draft | m | hydrostatics |