Towing & Ship-Assist · Interaction — Squat
Squat, which increases a tow's effective draft in shallow water, becomes more severe as the vessel:
- ASlows down
- BTurns into the current
- CLightens its load
- DIncreases speed and/or operates in a low under-keel-clearance, confined channel✓ Correct
Explanation
Squat (bodily sinkage and trim change) rises roughly with the square of speed and worsens in shallow, narrow water where return flow accelerates. Reducing speed is the primary control to avoid grounding from squat.
Authority: Bowditch; shallow-water effects
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