Towing & Ship-Assist · Interaction
'Squat' affecting a deep tow in a shallow channel results in:
- AThe vessel rising higher in the water at speed
- BBodily sinkage and change of trim as speed increases over a limited depth, reducing underkeel clearance✓ Correct
- CImproved steering
- DA reduction in draft
Explanation
In shallow water, the faster flow under the hull lowers pressure, causing the vessel to sit deeper (squat) and change trim, sharply reducing underkeel clearance. Squat increases roughly with the square of speed, so slowing down is the primary defense in thin water.
Authority: Shiphandling; squat in shallow water
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