The head of a rubble mound breakwater is to be constructed at Sohar port with a face slope of 1:2. The design water depth at this location is 7m and the bottom slope fronting the structure is 1:30. The deep water significant wave height is 4m and a significant period of 8 sc .
What weight tetrapod armor units (specific gravity = 2.4) are required for the head of breakwater?