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Additional info for BRITISH STANDARD 6349-7: 1991, Code of practice for maritime structures, Part 7: Guide to the design and construction of breakwaters
G. 1). g. Tetrapods and Dolosse are less stable when subjected to oblique wave attack than to perpendicular wave attack. It is possible that the suggested values of KD for concrete armour units will therefore need to be reduced further on this account. Lower KD values than those suggested should also be used if good interlock between the units cannot be assured, such as where a flat slope is adopted or where control of placing is poor. There is no definite guidance on this particular point and it is recommended that if slopes flatter than 1 in 3 are considered then great care should be taken and responses should be checked by hydraulic testing.
A survey of practice in the USA is given by Hales . No criteria have yet been established for determining the required width of anti-scour protection. In general, scour can be assumed to be greatest within one-quarter wavelength of the foot of the armour slope. The width of the toe or extent of protective apron needed depends on the depth of erodible bed material as well as the characteristics of the breaking wave and the strength of currents. 46 The size of stone required in an apron may be determined by assessing the size needed on the sea bed for threshold stability under the action of the design wave in the open sea, but allowing an increase in size to allow for the effects of wave breaking and downrush.
B Application: 0 % to 5 % damage and minor overtopping. c n is the number of layers. 5 to 1 : 5. 5 to 1 : 3. Source:  These formulae take account of the following variables which are not included in Hudson’s formula: a) wave period; b) surf similarity parameter; c) breaking wave conditions; d) duration of storm; e) permeability of core. The formulae are as follows. 81 m/s2), It should be noted that the design wave height in equations (3) and (4) is Hs while that currently recommended for equation (2) is H1/10.