Ship Stability_ Definition of Dock Water Allowance ( DWA )

Defines & explains the concepts of Dock Water Allowance
Some guys get confuse with change of draft and density. Please find below explanation.
Here the change is referred to difference between the two values. Thus change in draft means difference between the two values of drafts at different densities. Similarly change in density means the difference between the two. The magnitude of change that is difference between two quantities i.e. draft and density varies directly i.e. larger the change in density , larger will be the change in draft. However whether this change (or rather magnitude ,to be more specific) will result in increase or decrease that will need to be figured it out by simple rule. Going to larger (higher) density, ship will rise ( higher) and lesser (lower) density ship will be sink ( lower). Trust this avoids any ambiguity which many guys start relating mass= volume x density or mass= Area x draft x density thus daft is inversely proportional to density. This is correct for the relationship of draft and density. If we take the difference of the drafts at two different densities, the difference ( magnitude, to be more specific) will be directly proportional to each other.

Please refer following:
https://drive.google.com/file/d/1srCbD9cPj54GaDj8PK6ZZxXr1KqCBwgy/view?usp=sharing

Видео Ship Stability_ Definition of Dock Water Allowance ( DWA ) канала SAILORSTUBE