Sewage Holding Tank - Capacity Check

Required sewage holding-tank capacity for a given POB and passage length per MARPOL Annex IV special-area carriage rules - baseline 70 L/person·day.

SewageMARPOL IVCapacity

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

V_{holding} = \text{POB} \cdot d \cdot q_{pc} \cdot (1 + m)

Symbol	Meaning	Unit
$POB$	Persons on board (crew + pax)	pax
$d$	Retention days required	day
$q_{pc}$	Per-capita generation rate	L/day
$m$	Safety margin

Source: MARPOL Annex IV; MEPC.159(55) STP Guidelines

In short

Required sewage holding-tank capacity for a given POB and passage length per MARPOL Annex IV special-area carriage rules - baseline 70 L/person\u00b7day.

Learn the theory Marine Sewage and Grey Water Treatment Systems