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Appendix 1 - Downflooding height measurement examples

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Downflooding Height (upright) HD

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downflooding height

* If the engine space of an open boat is provided with a high water alarm and fitted with an efficient bilge pumping system, louvered engine space vents are not considered downflooding openings.

Appendix 2 - Evaluation criteria

Minimum downflooding height (m) in upright condition

Fully decked vessel
 
L/17
Open Vessel
6m - 7.5m
L/10
 
7.5m - 12m
0.75m
 
L - Length, as defined on page 4, in metres
 

Examples:
7 metre fully docked vessel
41 cm (7m/17 = 0.41 m)
 
7 metre open vessel
70 cm (7m/10 = 0.70 m)

Maximum allowed offset load heel angle

Vessel length (m) Maximum offset heel angle (°)
6 15.2
7 13.8
8 12.5
9 11.0
10 10.0
11 9.1
12 8.3

Minimum residual downflooding height

Vessel length (m) Minimum residual
downflooding height (m)
6 0.27
7 0.29
8 0.31
9 0.33
10 0.35
11 0.36
12 0.38

Note: Calculate values for intermediate lengths and for lengths over 12 m (not more than 15 tons gross tonnage)

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Date modified:
2010-01-21