What is the minimum speed required for sewage discharge beyond 12 nautical miles from the coast?

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Multiple Choice

What is the minimum speed required for sewage discharge beyond 12 nautical miles from the coast?

Explanation:
The concept here is regulatory limits on sewage discharges far from shore and how vessel motion helps with dilution. Beyond 12 nautical miles, sewage can be discharged under MARPOL Annex IV, but a speed requirement is in place to ensure the effluent is adequately dispersed by the surrounding water. Maintaining at least four knots creates enough turbulence and mixing to dilute the sewage and minimize localized impact. Discharging at slower speeds would not meet the dilution intent, while higher speeds are not required by the rule—four knots is the minimum.

The concept here is regulatory limits on sewage discharges far from shore and how vessel motion helps with dilution. Beyond 12 nautical miles, sewage can be discharged under MARPOL Annex IV, but a speed requirement is in place to ensure the effluent is adequately dispersed by the surrounding water. Maintaining at least four knots creates enough turbulence and mixing to dilute the sewage and minimize localized impact. Discharging at slower speeds would not meet the dilution intent, while higher speeds are not required by the rule—four knots is the minimum.

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