In the design of seawall, the following factors should be taken into consideration:
 

	selection of design wave
	stability against wave attack covering the design of :
	armour
	underlayers
	bedding layers
	core and toe protection
	crest level

 
In the Pak Shek Kok project, seawall was first constructed.  If seawall is constructed during reclamation filling, regular seabed surveys should be carried out to ensure that no mud waves affect the seawall under construction according to "Port Works Manual".

In the Pak Shek Kok reclamation, the seawall was founded on the alluvial sand/completely decomposed rock stratum at tentative level -14.0mPD.  The marine deposits underlying the seawall was completely removed by dredging.  After forming the foundation trench, a layer of sand and a layer of rubble were placed in sequence.  For the stability of rubble structures against wave attack, rock armour should cover the rubble core.  Finally, the armour should be trimmed to the designed slope profile.