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Schedule 2

(Regulation 10(1))

ASSIGNMENT OF FREEBOARD

Interpretation

1. Expressions in this Schedule have the same meanings as those assigned in Schedule 3, and —

“block coefficient (Cb)” means the product of —

where —

∇ is the volume of the moulded displacement of the ship, excluding bossing, where the ship has a metal shell, and of displacement to the outer surface of the hull where the ship has a shell of any other material, displacement being taken in each case at a moulded draught of d₁; and

d₁ is eighty-five per cent of the least moulded depth, provided that in no case shall the block coefficient (C_b) be taken to be less than 0.68;

“depth for freeboard (D)” means —
1. (a) except as otherwise stated in paragraph (b) below, the moulded depth of the ship amidships plus the thickness of the freeboard deck stringer plate where fitted, plus, where the exposed freeboard deck is sheathed, the product of —

where —

T is the mean thickness of the exposed sheathing clear of deck openings;

(b) in a ship having a rounded gunwale with a radius greater than 4 per cent of the breadth of the ship or having topsides of unusual form, the depth calculated in accordance with subparagraph (a), would be the depth for freeboard purposes of a ship having a midship section with vertical topsides and with the same round of beam and the same area of topside section as that of the midship section of the actual ship;

“effective length (E)” in relation to a superstructure means the effective length of the superstructure determined in accordance with the provisions of paragraph 9.3.1;

“flush deck ship” means a ship which has no superstructure on the freeboard deck;

“length (S)” in relation to a superstructure means the length of the superstructure determined in accordance with the provisions of paragraph 9.2.1;

“salt water” means water having a relative density of 1.025;

“Summer draught” means the draught measured from —
1. (a) in the case of a wood or composite ship, the lower edge of the keel rabbet;
1. (b) where the form at the lower part of the midship section is of a hollow character, or where thick garboards are fitted, the point where the line of the flat of the bottom continued inwards cuts the side of the keel; and
1. (c) in any other case, the top of the keel;

to the point which, when load lines and marks have been marked on the ship's side, will correspond to the centre of the ring of the load line mark;

“Summer Timber draught” means the draught measured from point (a),(b) or (c) described in the definition of the Summer draught to the point which when Timber load lines have been marked on the ship's side will correspond to the upper edge of the Summer Timber load line;

“tabular freeboard” means in the case of a Type “A” ship the freeboard appropriate to the ship's length under Freeboard Table A and, in the case of a Type “B” ship, the freeboard appropriate to the ship's length under Freeboard Table B.

Freeboards: general

2.1 Except as otherwise provided in subparagraph 2.2, the freeboards, other than Timber freeboards, to be assigned to a ship shall be determined in accordance with the provisions of Part I, and Timber freeboards to be assigned to a ship shall be determined in accordance with Part II.

2.2 The freeboards to be assigned to —

2.2.1 sailing ships;

2.2.2 tugs;

2.2.3 ships of wood or of composite construction or of other materials;

2.2.4 ships with constructional features such as to render freeboards determined in accordance with subparagraph 2.1 unreasonable or impracticable; and

2.2.5 unmanned barges having on the freeboard deck only small access openings closed by watertight gasketed covers of steel,

shall be determined in accordance with the provisions of Part III of this Schedule.

PART I
FREEBOARDS OTHER THAN TIMBER FREEBOARDS

Determination of freeboards

3.1 Subject to subparagraph 3.3, a Summer freeboard must be determined in accordance with the provisions of paragraphs 4 to 16.

3.2 Subject to subparagraph 3.3, a Tropical freeboard must be obtained by deducting from the Summer freeboard one forty-eighth (1/48th) of the Summer draught of the ship.

3.3 The freeboard under subparagraphs 3.1 and 3.2, but omitting a correction made in paragraph 8 for deck-line, must be not less than fifty millimetres except in the case of a ship with hatchways in Position 1 to which paragraph 5 applies but which do not have pontoon covers, in which case it must be not less than one hundred and fifty millimetres.

3.4 A Winter freeboard must be obtained by adding to a Summer freeboard one forty-eighth (1/48th) of the Summer draught of the ship.

3.5 A Winter North Atlantic freeboard must be obtained by adding to the Winter freeboard a distance of fifty millimetres.

3.6.1 Subject to subparagraph 3.6.2, a Fresh Water freeboard must be obtained by deducting from a Summer freeboard the quantity —

where —

∆ is the displacement in salt water in metric tons at the Summer load waterline, and T represents metric tons per centimetre immersion in salt water at that waterline.

3.6.2 In any case in which the displacement at that waterline cannot be ascertained the deduction must be one forty-eighth (1/48th) of the Summer draught of the ship.

Summer freeboard: Type “A” ships

4. A Summer freeboard assigned to a Type “A” ship must be determined as follows —

4.1 There must first be ascertained the ship's tabular freeboard from Table A.

4.2 Where the block coefficient (C_b) of the ship exceeds 0.68 the tabular freeboard must be multiplied by the factor —

4.3 Corrections in accordance with paragraphs 6 to 16 must be applied to the freeboard obtained in accordance with subparagraphs 4.1 and 4.2.

4.4 Subject to subparagraph 3.3, the freeboard so corrected must be the Summer freeboard assigned to the ship.

Summer freeboard: Type “B” ships

5. A Summer freeboard to be assigned to a Type “B” ship must be determined as follows

5.1 There must first be ascertained the ship's tabular freeboard from Table B.

5.2.1 If the ship has hatchways in Position 1 the covers of which are either pontoon covers complying with the requirements of subparagraph 5.4 of Schedule 3 or covers which comply with paragraph 6.2 of that Schedule, the tabular freeboard may be corrected in accordance with such of the provisions of subparagraphs 5.3 to 5.8 as are applicable to the ship.

5.2.2 If the ship has hatchways in Position 1 the covers of which comply with the requirements of paragraph 5 except those of subparagraph 5.4 of that paragraph, the tabular freeboard shall be corrected in accordance with the provisions of subparagraph 5.9.

5.3 The tabular freeboard of a ship to which subparagraph 5.2.1 applies and which exceeds 100 metres in length may be reduced by an amount not exceeding the maximum applicable under subparagraphs 5.4 and 5.5 where the Minister or any person or organization authorized by him or her is satisfied that —

5.3.1 all covers of hatchways in Positions 1 and 2 comply with the requirements of paragraph 6;

5.3.2 the freeing arrangements comply with the requirements of paragraph 14;

5.3.3 the measures for the protection of the crew comply with the requirements of paragraph 15;

5.3.4 in the case of a ship constructed before the 8th day of June, 2000, when the ship is loaded to the Summer load waterline it will remain afloat, after the flooding of a single damaged compartment other than the machinery space at an assumed permeability of 0.95, in the condition of equilibrium described in subparagraph 5.6 and if the length of the ship exceeds two hundred and twenty-five metres the machinery space shall rank as a floodable compartment for the purposes of this requirement having for the purpose an assumed permeability of 0.85.

5.3.5 in the case of a ship constructed on or after the 8th day of June, 2000 which is loaded in accordance with the initial condition of loading before flooding, the ship will —

5.3.5.1 be able to withstand the flooding of a compartment or compartments, with an assumed permeability of 0.95, consequent upon the damage assumptions specified in paragraph 5.8, and,

5.3.5.2 remain afloat in a satisfactory condition of equilibrium, as referred to in subparagraph 5.6; and if the ship is over one hundred and fifty metres in length, the machinery space shall be treated for these purposes as a floodable compartment, but with a permeability of 0.85.

5.4 Subject to subparagraph 5.5 no reduction of freeboard under subparagraph 5.3 shall exceed 60% cent of the difference between the tabular freeboards under Freeboard Table A and Freeboard Table B.

5.5 The reduction of 60% under subparagraph 5.4 may be increased to 100% if the Minister or a person or organization authorized by him or her is satisfied that —

5.5.1 the ship complies with paragraphs 17 and 20 as if it were a Type “A” ship paragraph 22;

5.5.2 the ship complies with subparagraphs 5.3.1 to 5.3.3;

5.5.3 in the case of a ship constructed before the 8th day of June, 2000, when loaded to the Summer waterline the ship remains afloat in the condition of equilibrium under subparagraph 5.6 after the flooding —

5.5.3.1 of two compartments adjacent fore and aft, neither of which is the machinery space, at an assumed permeability of 0.95; and

5.5.3.2 in the case of a ship exceeding two hundred and twenty-five metres in length, of the machinery space alone, at an assumed permeability of 0.85; and

5.5.4 in the case of a ship constructed on or after 8th June, 2000, the ship complies with the requirements of subparagraph 5.3.5; but in relation to the damage assumptions specified in subparagraph 5.8, throughout the length of the ship any one transverse bulkhead will be assumed to be damaged, such that two adjacent fore and aft compartments shall be flooded simultaneously, except that such damage will not apply to the boundary bulkheads of a machinery space.

5.6 In the case of a ship constructed before the 8th day of June, 2000, the condition of equilibrium referred to in subparagraphs 5.3 and 5.5 above is as follows —

5.6.1 the final waterline after flooding is below the top of a ventilator coaming, the lower edge of an air pipe opening, the upper edge of the sill of an access opening fitted with a weathertight door, and the lower edge of another opening through which progressive flooding may take place;

5.6.2 the angle of heel due to asymmetrical flooding does not exceed 150, or where no part of the deck is immersed the angle of heel does not exceed 170; and

5.6.3 the metacentric height calculated using the constant displacement method has a positive value of at least fifty millimetres in the upright condition after flooding; and

5.6.4 the ship has adequate residual stability; and

5.6.5 the ship has sufficient stability during intermediate stages of flooding to the satisfaction of the Minister or a person or organization authorized by him or her;

5.7 In the case of a ship constructed before the 8th day of June, 2000, the following assumptions are made for the purposes of calculations under subparagraphs 5.3.4 and 5.5.3 —

5.7.1 the vertical extent of damage is equal to the depth of the ship at the point of damage, measured from and including the freeboard deck at side to the underside of the keel;

5.7.2 the transverse penetration of damage is not more than one fifth of the breadth of the ship (B), this distance being measured inboard from the ship's side at right angles to the centre line of the ship at the level of the Summer load waterline. The depth of transverse penetration damage assumed shall be that which results in the most severe conditions;

5.7.3 except in the case of compartments under subparagraph 5.5.3.1, no transverse bulkhead is damaged;

5.7.4 the height of the centre of gravity above the baseline is assessed allowing for homogeneous loading of cargo holds and for 50 per cent of the designed capacity of consumable fluids and stores.

5.8 In the case of a ship constructed on or after the 8th day June, 2000, the following assumptions shall be made for the purposes of the calculations under subparagraphs 5.3.5 and 5.5.4 —

5.8.1 the vertical extent of damage in all cases is assumed to be from the base line upwards without limit;

5.8.2 the transverse extent of damage is equal to one fifth of the breadth of the ship (B) or 11.5 meters, whichever is the lesser, measured inboard from the side of the ship perpendicularly to the centreline at the level of the summer load waterline;

5.8.3 if damage of a lesser extent than that specified in subparagraphs 5.8.1 and 5.8.2 results in a more severe condition, such lesser extent shall be assumed;

5.8.4 except where otherwise required by subparagraph 5.5, the flooding shall be confined to a single compartment between adjacent transverse bulkheads provided the inner longitudinal boundary of the compartment is not in a position within the transverse extent of assumed damage. Transverse boundary bulkheads of wing tanks which do not extend over the full breadth of the ship shall be assumed not to be damaged, provided they extend beyond the transverse extent of assumed damage prescribed in subparagraph 5.8.2.

If in a transverse bulkhead there are steps or recesses of not more than 3m in length located within the transverse extent of assumed damage as defined under subparagraph 5.8.2, such transverse bulkhead may be assumed intact and the adjacent compartment may be flooded singly. If, however, within the transverse extent of assumed damage there is a step or recess of more than 3m in length in a transverse bulkhead, the two compartments adjacent to this bulkhead shall be considered as flooded. The step formed by the afterpeak bulkhead and the afterpeak tank top shall not be regarded as a step for the purpose of this subparagraph;

5.8.5 if a main transverse bulkhead is located within the transverse extent of assumed damage and is stepped in way of a double bottom or side tank by more than 3m, the double bottom or side tanks adjacent to the stepped portion of the main transverse bulkhead shall be considered as flooded simultaneously. If this side tank has openings, into one or several holds, such as grain feeding holes, such hold or holds shall be considered as flooded simultaneously. Similarly in a ship designed for the carriage of liquid cargoes, where a side tank has openings into adjacent compartments, such adjacent compartments shall be considered as empty and as being flooded simultaneously. This provision is applicable even where such openings are fitted with closing appliances, except in the case of sluice valves fitted in bulkheads between tanks and where the valves are controlled from the deck. Manhole covers with closely spaced bolts are considered equivalent to the unpierced bulkhead except in the case of openings in topside tanks common to the holds;

5.8.6 if the flooding of any two adjacent fore and aft compartments is envisaged, main transverse watertight bulkheads shall be spaced at least 1/3 L 2/3 or 14.5m, whichever is the lesser, in order to be considered effective. Where transverse bulkheads are spaced at a lesser distance, one or more of these bulkheads shall be assumed as non-existent in order to achieve the minimum spacing between bulkheads.

5.9 The tabular freeboard of a ship to which subparagraph 5.2.2 applies must be increased by the amount shown in Table 1 appropriate to the ship's length.

Freeboards, at intermediate lengths of ship shall be obtained by linear interpolation. The increase in the case of ships of more than two hundred metres in length shall be by an amount which the Minister determines in each particular case.

TABLE 1

Length of ship (metres)	Freeboard increase (millimetres)	Length of ship (metres)	Freeboard increase (millimetres)	Length of ship (metres)	Freeboard increase (millimetres)
108 and below	0	139	175	170	90
109	52	140	181	171	292
110	55	141	186	172	294
111	57	142	191	173	297
112	59	143	196	174	299
113	62	144	201	175	301
114	64	145	206	176	304
115	68	146	210	177	306
116	70	147	215	178	308
117	73	148	219	179	311
118	76	149	224	180	313
119	80	150	228	181	315
120	84	151	232	182	318
121	87	152	236	183	320
122	91	153	240	184	322
123	95	154	244	185	325
124	99	155	247	186	327
125	103	156	251	187	329
126	108	157	254	188	332
127	112	158	258	189	334
128	116	159	261	190	336
129	121	160	264	191	339
130	126	161	267	192	341
131	131	162	270	193	343
132	136	163	273	194	346
133	142	164	275	195	348
134	147	165	278	196	350
135	153	166	280	197	353
136	159	167	283	198	355
137	164	168	285	199	357
138	170	169	287	200	358

5.10.1 This subparagraph applies to a Type “B” ship of not more than one hundred metres in length having enclosed superstructures the total effective length (E) of which does not exceed 35% of the ship's length (L).

5.10.2 The freeboard calculated in respect of such a ship under paragraph 5.10.1 in accordance with subparagraphs 5.1, 5.2 and 5.9 must be increased by the following amount —

5.11 In the case of a ship with a block coefficient (C_b) exceeding 0.68, the freeboard calculated in accordance with subparagraphs 5.1 to 5.10 must multiplied by the factor —

5.12 Corrections in accordance with paragraphs 6 to 16 must be applied to the freeboard calculated under subparagraphs 5.1 to 5.11 and, subject to paragraph 3.3, the freeboard corrected is the Summer freeboard to be assigned to the ship.

Length of ship (metres)	Freeboard increase (millimetres)	Length of ship (metres)	Freeboard increase (millimetres)	Length of ship (metres)	Freeboard increase (millimetres)
134	147	165	278	196	350
135	153	166	280	197	353
136	159	167	283	198	355
137	164	168	285	199	357
138	170	169	287	200	358

Basic freeboard

6. In the following paragraphs “basic freeboard” means the accordance with paragraph 4 or 5, whichever is applicable, but ship, the corrections referred to in paragraph 4.3, or in the case of a referred to in paragraph 5.12.

Correction for Depth

7.1 Where the depth for freeboard (D) exceeds_{, the basic freeboard of the ship shall be increased by – _{millimetres where R is —}}

_{, in the case of a ship less than 120 metres in length; and}

250 in the case of a ship of 120 metres or more in length.

7.2 Where (D) is less than_{, the basic freeboard of the ship shall be reduced by —}

_millimetres

where, but only where, the ship has, subject to subparagraph 7.3 —

7.2.1 an enclosed superstructure covering at least 0.6 (L) amidships;

7.2.2 an efficient trunk extending for the ship's length; or

7.2.3 a combination of enclosed superstructures connected by efficient trunks, being a combination extending for the ship's length.

7.3 If the height of any such superstructure or trunk in subparagraph 7.2 is less than standard height the amount of reduction shall be reduced in the ratio of the actual to the standard height of the superstructure or trunk.

Correction for position of deck-line

8.1 Subject to the provisions of subparagraph 8.2, if the actual depth to the upper edge of the deck-line is greater or less than the depth for freeboard, the difference where greater shall be added to, or if less shall be deducted from, the basic freeboard of the ship.

8.2 If the position of the deck-line has been fixed under regulation 4(2), the actual depth of the ship must be taken to the point amidships where the continuation outwards of the upper surface of the freeboard deck or of any sheathing on that deck intersects the outer surface of the shell of the ship.

Standard height, length and effective length of superstructures

9.1 The standard height of a superstructure is determined in accordance with Table 2 —

TABLE 2

Length of ship (L) (metres)	Standard Height (metres)
	Raised quarter deck	Superstructure other than a raised quarter deck
30 or less	0.90	1.80
75	1.20	1.80
125 or more	1.80	2.30

Standard heights for intermediate lengths of the ship are obtained by linear interpolation.

9.2.1 Subject to subparagraph 9.2.2, the length of a superstructure (S) is the mean length of the parts of the superstructure which lie within the length of the ship.

9.2.2 In the case of an enclosed superstructure having an end bulkhead which extends in a fair convex curve beyond its intersection with the superstructure sides, the length of the superstructure (S) may be taken as its length determined in accordance with subparagraph 9.2.1, but increased by two-thirds of the fore and aft extent of the curvature to a maximum of one half the breadth of the superstructure at the point of intersection of the curved end of the superstructure with its side.

9.3.1 In the case of an enclosed superstructure of standard height, the effective length of a superstructure (E) shall be, subject to subparagraph 9.3.3 —

9.3.1.1 its length; or

9.3.1.2 where the superstructure is set in from the sides of the ship, its length modified in the ratio b/B_s, where —

9.3.1.2.1 “b” is the breadth of the superstructure at the middle of its length; and

9.3.1.2.2 “B_s” is the breadth of the ship at the middle of the length of the superstructure:

where the superstructure is only set in for part of its length, this modification shall be applied only to that part.

9.3.2 In the case of an enclosed superstructure of less than standard height the effective length of a superstructure, subject to subparagraphs 9.3.1 and 9.3.3 are its length reduced in the ratio of the actual height of the superstructure to its standard height.

9.3.3 In the case of an enclosed superstructure consisting of a raised quarter deck the effective length of a superstructure must, if the deck is fitted with an intact front bulkhead, be its length subject to a maximum of 0.6 of the ship's length and, where not so fitted, be determined by treating the raised quarter deck as a poop of less than standard height.

9.3.4 A superstructure which is not an enclosed superstructure as defined in paragraph 9.3.1 has no effective length.

Standard height and effective length of trunks

10.1 The standard height of a trunk is that applicable to a superstructure other than a raised quarter deck in paragraph 9.1.

10.2 The effective length of a trunk is determined as follows —

10.2.1 a trunk which is not an efficient trunk as described in subparagraph 10.2.2 has no effective length;

10.2.2 a trunk is treated as an efficient trunk if —

10.2.2.1 it is at least as strong as a superstructure;

10.2.2.2 the hatchways in way of the trunk are in the trunk deck, and the hatchway coamings and covers comply with the requirements of paragraphs 4 to 6, except that small access openings with watertight covers may be permitted in the freeboard deck;

10.2.2.3 the width of the trunk deck stringer provides a satisfactory gangway and sufficient lateral stiffness;

10.2.2.4 a permanent working platform fore and aft fitted with guard rails or guard wires complying with applicable requirements in subparagraph 18.2.1 is provided by the trunk deck, or by detached trunks connected to superstructures by efficient permanent gangways;

10.2.2.5 ventilators are protected by the trunk, by watertight covers or by equivalent means;

10.2.2.6 open rails or wires are fitted on the weather parts of the freeboard deck in way of the trunk for at least half their length;

10.2.2.7 the machinery casings are protected by the trunk, or by an enclosed superstructure of at least standard height, or by a deckhouse of the same height, strength and weathertightness equivalent to such an enclosed superstructure;

10.2.2.8 the breadth of the trunk is at least 60% of the breadth of the ship;

10.2.2.9 If there is no superstructure the length of the trunk is at least 0.6(L).

10.2.3 Except as otherwise provided in subparagraph 10.2.4, the effective length of an efficient trunk is its full length reduced in the ratio of its mean breadth to the breadth of the ship.

10.2.4 If the actual height of an efficient trunk is less than the standard height, its effective length shall be the length calculated under subparagraph 10.2.3 reduced in the ratio of the actual to the standard height of the trunk. In addition, where the ship is a Type “B” ship and the height of hatchway coamings on the trunk deck is less than that required by subparagraph 5.1 a reduction from the actual height of the trunk shall be made of an amount corresponding to the difference between the actual height and the required height of the hatchway coamings.

Deduction for effective length of superstructures and trunks

11.1 If the sum of the effective lengths of superstructures and trunks of a ship is 1.0(L), the basic freeboard of the ship shall be reduced by —

three hundred and fifty millimetres if the ship is twenty-four metres in length (L);

eight hundred and sixty millimetres if the ship is eighty-five metres in length (L);

one thousand and seventy millimetres if the ship is one hundred and twenty-two metres in length or more;

and by amounts obtained by linear interpolation in the case of ships of intermediate length.

11.2 If the sum of the effective lengths of superstructures and trunks are less than 1.0 (L), the basic freeboard of a ship shall be reduced by a percentage of the figures in subparagraph 11.1 according to the total effective length of its superstructures and trunks as follows —

11.2.1 In the case of a Type “A” ship, by a percentage given in Table 3, the percentage in the case of a ship having superstructures and trunks of an effective length intermediate to those specified in Table 3 is to be obtained by linear interpolation.

11.2.2.1 Subject to subparagraphs 11.2.2.2, 11.2.2.3 and 11.2.2.4, in the case of a Type “B” ship, by a percentage given in Table 4. The percentage in the case of a ship having superstructures and trunks of an effective length intermediate to those specified in Table 4 is to be obtained by linear interpolation.

11.2.2.2 If the effective length of a bridge covers less than 0.1(L) before and 0.1(L) abaft amidships the percentages shall be obtained by linear interpolation between the lines I and II.

11.2.2.3 If the effective length of a forecastle is more than 0.4 (L), the percentages are obtained from line II.

11.2.2.4 If the effective length of a forecastle is less than 0.07 (L), the above percentages are reduced by —

where “f” is the effective length of the forecastle.

TABLE 3
PERCENTAGE OF DEDUCTION FOR TYPE “A” SHIPS

Percentage of deduction for all types of superstructure and trunks		Total effective length of superstructure and trunks
	0	0.1 (L)	0.2 (L)	0.3 (L)	0.4 (L)	0.5 (L)	0.6 (L)	0.7 (L)	0.8 (L)	0.9 (L)	1.0 (L)
	0	7	14	21	31	41	52	63	75.3	87.7	100

TABLE 4
PERCENTAGE OF DEDUCTION FOR TYPE “B” SHIPS

Ships with forecastle and without detached bridge	Total effective length of superstructure and trunks
	Line	0	0.1 (L)	0.2 (L)	0.3 (L)	0.4 (L)	0.5 (L)	0.6 (L)	0.7 (L)	0.8 (L)	0.9 (L)	1.0 (L)
	I	0	5	10	15	23.5	32	46	63	75.3	87.7	100
Total effective length of superstructure and trunks	II	0	6.3	12.7	19	27.5	36	46	63	75.3	87.7	100

Measurement of Sheer

12.1 The sheer is measured from the deck at side to a line of reference drawn parallel to the keel through the sheer line amidships.

12.2 In ships designed with a rake of keel, the sheer is measured in relation to a line of reference drawn parallel to the design load waterline.

12.3 In flush deck ships and in ships with detached superstructures the sheer is measured at the freeboard deck.

12.4 In ships with topsides of unusual form in which there is a step or break in the topsides, the sheer is considered in relation to the equivalent depth amidships.

12.5 In ships with a superstructure of standard height which extends over the whole length of the freeboard deck, the sheer is measured at the superstructure deck. If the height of the superstructure exceeds the standard height the least difference (Z) between the actual and standard heights shall be added to each end ordinate. Similarly, the intermediate ordinates at distances of 1/6(L) and 1/3(L) from each perpendicular is increased by 0.444 (Z) and 0.111 (Z) respectively.

12.6 If the deck of an enclosed superstructure has at least the same sheer as the exposed freeboard deck, the sheer of the enclosed portion of the freeboard deck is not taken into account.

12.7 If an enclosed poop or forecastle is —

12.7.1 of standard height with greater sheer than that of the freeboard deck; or

12.7.2 is of more than standard height;

an addition to the sheer of the freeboard deck shall be made calculated in accordance with subparagraph 14.4.

Standard sheer profile

13. The ordinates of the standard sheer profile are given in Table 5 —

TABLE 5

	Station	Ordinate (in millimetres)	Factor
After half	After perpendicular	25.0((L)/3 + 10)	1
	(A.P.)	11.1((L)/3 + 10)	3
	1/6(L) from A.P.	2.8((L)/3 + 10)	3
	1/3(L) from A.P.	0	1
	Amidships
Forward half	Amidships	0	1
	1/3(L) from F.P.	5.6((L)/3 + 10)	3
	1/6(L) from F.P.	22.2((L)/3 + 10)	3
	Forward perpendicular (F.P.)	50.0((L)/3 + 10	1

Measurement of variation front standard sheer profile

14.1 If the sheer profile differs from the standard sheer profile, the four ordinates of each profile in the forward or after halves of the ship shall be multiplied by the appropriate factors given in paragraph 13. The difference between the sums of the respective products and those of the standard divided by eight is the deficiency or excess of sheer in the forward or after half. The arithmetical mean of the excess or deficiency in the forward and after halves is the excess or deficiency of sheer.

14.2 If the after half of the sheer profile is greater than the standard sheer profile and the forward half is less than the standard sheer profile, no credit is allowed for the part in excess, and deficiency only is measured.

14.3 If the forward half of the sheer profile exceeds the standard sheer profile, and the after half of the sheer profile is not less than 75 % of the standard sheer profile, credit shall be allowed for the part in excess. If the after half of the sheer profile is less than 50% of the standard sheer profile, no credit shall be given for the excess of sheer forward. Where the sheer in the after half is between 50% and 75% of the standard sheer profile, intermediate allowances may be granted for excess sheer forward.

14.4 If sheer credit is given for a poop or forecastle the following formula is used —

where —

s = sheer credit, to be deducted from the deficiency or added to the excess of sheer;

y = difference between actual and standard height of superstructure at the after or forward perpendicular; and

L' = mean enclosed length of poop or forecastle up to a maximum length of 0.5 (L).

This formula provides a curve in the form of a parabola tangential to the actual sheer curve at the freeboard deck and intersecting the end ordinate at a point below the superstructure deck at a distance equal to the standard height of the poop or forecastle. The superstructure deck is not less than standard height above this curve at any point. This curve is used in determining the sheer profile for the forward and the after halves of the ship.

Correction for Variations from standard sheer profile

15.1 The correction for sheer shall be the deficiency or excess of sheer determined under paragraph 14 multiplied by —

15.2 In the case of a ship with sheer less than the standard sheer profile, the correction for deficiency of sheer determined in accordance with subparagraph 15.1 shall be added to the basic freeboard of the ship.

15.3 Subject to subparagraph 15.4, in the case of a ship having an excess of sheer —

15.3.1 If an enclosed superstructure covers 0.1(L) before and 0.1(L) abaft amidships, the correction for excess of sheer determined in accordance with subparagraph 15.1 shall be deducted from the basic freeboard of the ship;

15.3.2 If no enclosed superstructure covers amidships, no deductions shall be made from the basic freeboard of the ship;

15.3.3 If an enclosed superstructure covers less than 0.1(L) before and 0.1(L) abaft amidships, the correction for excess of sheer determined in accordance with subparagraph 15.1 shall be modified in the ratio of the amount of 0.2(L) amidship which is covered by the superstructure, to 0.2(L).

15.4 The maximum deduction for excess sheer is at the rate of one hundred and twenty-five millimetres per one hundred metres of length (L).

Correction for minimum bow height

16.1 Except as otherwise provided in subparagraphs 16.2 and 16.3, if the bow height determined under subparagraph 16.4 is less than the minimum bow height determined in accordance with subparagraph 16.5, the freeboard determined for the ship is increased by an amount equal to the difference between the bow height and the minimum bow height.

16.2 If an existing ship to which subparagraph 16.1 applies has been so constructed or modified as to comply with all the requirements of Schedule 3 applicable to a new ship of its type and is to be assigned freeboards determined in accordance with this Schedule —

16.2.1 the forecastle is less than 0.07(L);

16.2.2 the sheer extends for less than 15% of the ship's length (L) measured from the forward perpendicular,

the freeboard is increased by an amount as the Minister or person or organization authorized by the Minister determines in each particular case.

16.3 In the case of a ship to which subparagraph 16.1 applies, being a ship which is constructed to meet exceptional operational requirements, the correction to be made in accordance with subparagraphs 16.1 and 16.2 may be reduced or waived if the Director is satisfied that the safety of the ship will not be impaired in consequence of the worst sea and weather conditions likely to be encountered by the ship in service.

16.4 The bow height of a ship is the vertical distance at the forward perpendicular between the Summer load waterline at the designed trim and the top of the exposed deck at side.

16.4.1 If the bow height is obtained by including sheer, the sheer shall extend for no less than 15% of length (L) measured from the forward perpendicular.

16.4.2 If the bow height is obtained by including the height of a superstructure, such superstructure shall —

16.4.2.1 extend from the stem to a point not less than 0.07 of the ship's length (L) measured from the forward perpendicular;

16.4.2.2 If length (L) is one hundred metres or less, be an enclosed superstructure; and

16.4.2.3 If length (L) exceeds one hundred metres in length, be fitted with satisfactory closing appliances.

16.5 The minimum bow height in millimetres shall be —

where (L) is less than two hundred and fifty metres; and

where (L) is two hundred and fifty metres or more;

C_b shall not be taken as less than 0.68.

PART II
TIMBER FREEBOARDS

Summer Timber freeboard

17. The Summer Timber freeboard is the freeboard determined in accordance with the provisions of subparagraphs 5.1, 5.2.1, 5.10.1, 5.10.2 and 5.11 and corrected in accordance with the provisions of subparagraphs 6 to 15, except that the percentages in Table 6 are substituted for those given in Table 4 of paragraph 11.2.

TABLE 6
PERCENTAGE OF DEDUCTION FOR TYPE SHIPS

Percentage of deduction for all types of superstructure and trunks	Total effective length of superstructure and trunks
	0	0.1 (L)	0.2 (L)	0.3 (L)	0.4 (L)	0.5 (L)	0.6 (L)	0.7 (L)	0.8 (L)	0.9 (L)	1.0 (L)
	20	31	42	53	64	70	76	82	88	94	100

Percentages at intermediate lengths superstructures are obtained by linear interpolation.

Other Timber freeboards

18.1 A Winter Timber freeboard is obtained by adding to the Summer Timber freeboard one thirty-sixth of the Summer Timber draught.

18.2 A Winter North Atlantic Timber freeboard is the same as the Winter North Atlantic freeboard assigned.

18.3 A Tropical Timber freeboard is obtained by deducting from the Summer Timber freeboard one forty-eighth of the Summer Timber draught.

18.4.1 The Fresh Water Timber freeboard shall, subject to subparagraph 18.4.2, obtained by deducting from the Summer Timber freeboard the quantity —

_centimetres

where —

_∆ _{is the displacement in salt water in tonnes at the waterline which will when load lines have been marked on the ship's side correspond to the Summer Timber load line; and}

_T _{represents tonnes per centimetre immersion in salt water at that waterline.}

18.4.2 If the displacement at that waterline cannot be ascertained, the deduction is one forty-eighth (1/48th) of the Summer Timber draught of the ship.

PART III
SAILING SHIPS AND OTHER SHIPS

Sailing ships and tugs

19. The freeboards to be assigned to sailing ships and tugs are freeboards determined under Part I of this Schedule increased by such amounts as the Director directs in each particular case.

Ships of wood and other ships

20. The freeboards to be assigned to wooden ships or of composite construction or of other materials, or to ships with constructional features such as to render freeboards calculated under Part I of this Schedule unreasonable or impracticable shall be determined by the Minister or any person or organization authorized by the Minister in each particular case.

Unmanned barges

21. The freeboards to be assigned to unmanned barges having on the freeboard deck small access openings closed by watertight gasketed covers of steel shall be freeboards determined in accordance with the provisions of Part I of this Schedule omitting paragraphs 5 and 16. Such freeboards may be reduced by such amounts not exceeding twenty-five per cent as the Director may direct in each particular case.

FREEBOARD TABLES

22. The following is the Freeboard Table A referred to in paragraph 4 of this Schedule —

TABLE A
FREEBOARD TABLE TYPE “A” SHIPS

Length of Ship (metres)	Freeboard (millimetres)	Length of ship (metres)	Freeboard (millimetres)	Length of ship (metres)	Freeboard (millimetres)
24	200	64	626	104	1196
25	208	65	639	105	1212
26	217	66	653	106	1228
27	225	67	666	107	1244
28	233	68	680	108	1260
29	242	69	693	109	1276
30	250	70	706	110	1293
31	258	71	720	111	1309
32	267	72	733	112	1326
33	275	73	746	113	1342
34	283	74	760	114	1359
35	292	75	773	115	1376
36	300	76	786	116	1392
37	308	77	800	117	1409
38	316	78	814	118	1426
39	325	79	828	119	1442
40	334	80	841	120	1459
41	344	81	855	121	1476
42	354	82	869	122	1494
43	364	83	883	123	1511
44	374	84	897	124	1528
45	385	85	911	125	1546
46	396	86	926	126	1563
47	408	87	940	127	1580
48	420	88	955	128	1598
49	432	89	969	129	1615
50	443	90	984	130	1632
51	455	91	999	131	1650
52	467	92	1014	132	1667
53	478	93	1029	133	1684
54	490	94	1044	134	1702
55	503	95	1059	135	1719
56	516	96	1074	136	1736
57	530	97	1089	137	1753
58	544	98	1105	138	1770
59	559	99	1120	139	1787
60	573	100	1135	140	1803
61	587	101	1151	141	1820
62	600	102	1166	142	1837
63	613	103	1181	143	1853
144	1870	197	2582	250	3012
145	1886	198	2592	251	3018
146	1903	199	2602	252	3024
147	1919	200	2612	253	3030
148	1935	201	2622	254	3036
149	1952	202	2632	255	3042
150	1968	203	2641	256	3048
151	1984	204	2650	257	3054
152	2000	205	2659	258	3060
153	2016	206	2669	259	3066
154	2032	207	2678	260	3072
155	2048	208	2687	261	3078
156	2064	209	2696	262	3084
157	2080	210	2705	263	3089
158	2096	211	2714	264	3095
159	2111	212	2723	265	3101
160	2126	213	2732	266	3106
161	2141	214	2741	267	3112
162	2155	215	2749	268	3117
163	2169	216	2758	269	3123
164	2184	217	2767	270	3128
165	2198	218	2775	271	3133
166	2212	219	2784	272	3138
167	2226	220	2792	273	3143
168	2240	221	2801	274	3148
169	2254	222	2809	275	3153
170	2268	223	2817	276	3158
171	2281	224	2825	277	3163
172	2294	225	2833	278	3167
173	2307	226	2841	279	3172
174	2320	227	2849	280	3176
175	2332	228	2857	281	3181
176	2345	229	2865	282	3185
177	2357	230	2872	283	3189
178	2369	231	2880	284	3194
179	2381	232	2888	285	3198
180	2393	233	2895	286	3202
181	2405	234	2903	287	3207
182	2416	235	2910	288	3211
183	2428	236	2918	289	3215
184	2440	237	2925	290	3220
185	2451	238	2932	291	3224
186	2463	239	2939	292	3228
187	2474	240	2946	293	3233
188	2486	241	2953	294	3237
189	2497	242	2959	295	3241
190	2508	243	2966	296	3246
191	2519	244	2973	297	3250
192	2530	245	2979	298	3254
193	2541	246	2986	299	3258
194	2552	247	2993	300	3262
195	2562	248	3000	301	3266
196	2572	249	3006	302	3270
303	3274	324	3342	345	3394
304	3278	325	3345	346	3396
305	3281	326	3347	347	3399
306	3285	327	3350	348	3401
307	3288	328	3353	349	3403
308	3292	329	3355	350	3406
309	3295	330	3358	351	3408
310	3298	331	3361	352	3410
311	3302	332	3363	353	3412
312	3305	333	3366	354	3414
313	3308	334	3368	355	3416
314	3312	335	3371	356	3418
315	3315	336	3373	357	3420
316	3318	337	3375	358	3422
317	3322	338	3378	359	3423
318	3325	339	3380	360	3425
319	3328	340	3382	361	3427
320	3331	341	3385	362	3428
321	3334	342	3387	363	3430
322	3337	343	3389	364	3432
323	3339	344	3392	365	3433

Freeboards at intermediate lengths of ship are obtained by linear interpolation.

Freeboards, in millimetres, at length of ship less than twenty-four metres shall be —

TABLE B
FREEBOARD TABLE FOR TYPE “B” SHIPS

Length of Ship (metres)		Freeboard (millimetres)	Length of ship (metres)	Freeboard (millimetres)	Length of ship (metres)	Freeboard (millimetres)
24		200	72	754	120	1690
25		208	73	769	121	1709
26		217	74	784	122	1729
27		225	75	800	123	1750
28		233	76	816	124	1771
29		242	77	833	125	1793
30		250	78	850	126	1815
31		258	79	868	127	1837
32		267	80	887	128	1859
33		275	81	905	129	1880
34		283	82	923	130	1901
35		292	83	942	131	1921
36		300	84	960	132	1940
37		308	85	978	133	1959
38		316	86	996	134	1979
39		325	87	1015	135	2000
40		334	88	1034	136	2021
41		344	89	1054	137	2043
42		354	90	1075	138	2065
43		364	91	1096	139	2087
44		374	92	1116	140	2109
45		385	93	1135	141	2130
46		396	94	1154	142	2131
47		408	95	1172	143	2171
48		420	96	1190	144	2190
49		432	97	1209	145	2209
50		443	98	1229	146	2229
51		455	99	1250	147	2250
52		467	100	1271	148	2271
53		478	101	1293	149	2293
54		490	102	1315	150	2315
55		503	103	1337	151	2334
56		516	104	1359	152	2354
57		530	105	1380	153	2375
58	544		106	1401	154		2396
59	559		107	1421	155		2418
60	573		108	1440	156		2440
61	587		109	1459	157		2460
62	601		110	1479	158		2480
63	615		111	1500	159		2500
64	629		112	1521	160		2520
65	644		113	1543	161		2540
66	659		114	1565	162		2560
67	674		115	1587	163		2580
68	689		116	1609	164		2600
69	705		117	1630	165		2620
70	721		118	1651	166		2640
71	738		119	1671	167		2660
168	2680		221	3601	274		4327
169	2698		222	3615	275		4339
170	2716		223	3630	276		4350
171	2735		224	3645	277		4362
172	2754		225	3660	278		4373
173	2774		226	3675	279		4385
174	2795		227	3690	280		4397
175	2815		228	3705	281		4408
176	2835		229	3720	282		4420
177	2855		230	3735	283		4432
178	2875		231	3750	284		4443
179	2895		232	3765	285		4455
180	2915		233	3780	286		4467
181	2933		234	3795	287		4478
182	2952		235	3808	288		4490
183	2970		236	3821	289		4502
184	2988		237	3835	290		4513
185	3007		238	3849	291		4525
186	3025		239	3864	292		4537
187	3044		240	3880	293		4548
188	3062		241	3893	294		4560
189	3080		242	3906	295		4572
190	3098		243	3920	296		4583
191	3116		244	3934	297		4595
192	3134		245	3949	298		4607
193	3151		246	3965	299		4618
194	3167		247	3978	300		4630
195	3185		248	3992	301		4642
196	3202		249	4005	302		4654
197	3219		250	4018	303		4665
198	3235		251	4032	304		4676
199	3249		252	4045	305		4686
200	3264		253	4058	306		4695
201	3280		254	4072	307		4704
202	3296		255	4085	308		4714
203	3313		256	4098	309		4725
204	3330		257	4112	310		4736
205	3347		258	4125	311		4748
206	3363		259	4139	312		4757
207	3380		260	4152	313		4768
208	3397		261	4165	314		4779
209	3413		262	4177	315		4790
210	3430		263	4189	316		4801
211	3445		264	4201	317		4812
212	3460		265	4214	318		4823
213	3475		266	4227	319		4834
214	3490		267	4240	320		4844
215	3505		268	4252	321		4855
216	3520		269	4264	322		4866
217	3537		270	4276	323		4878
218	3554		271	4289	324		4890
219	3570		272	4302	325		4899
220	3586		273	4315	326		4909
327	4920		340	5055	353		5190
328	4931		341	5065	354		5200
329	4943		342	5075	355		5210
330	4955		343	5086	356		5220
331	4965		344	5087	357		5230
332	4975		345	5108	358		5240
333	4985		346	5119	359		5250
334	4995		347	5130	360		5260
335	5005		348	5140	361		5268
336	5015		349	5150	362		5276
337	5025		350	5160	363		5285
338	5035		351	5170	364		5294
339	5045		352	5180	365		5303