Bodily Sinkage from Weight Addition

Parallel sinkage (or rise) when a weight is added - Δdraft = w / TPC.

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Formula, assumptions, and limits

\Delta T = \frac{w}{\text{TPC}}

Symbol	Meaning	Unit
$w$	Added weight	t
$TPC$	Tonnes per centimetre at current draft	t / cm
$\Delta T$	Parallel sinkage	cm

Source: Derrett & Barrass Ch.9

Parallel sinkage (or rise) when a weight is added - \u0394draft = w / TPC.