Handbook of Coastal Engineering

Appendix B: Tables

TABLE B-1: K D values for use in determining armor unit weight (source: EM 1110 2 2904)

Structure Trunk [(7)]

Structure Head

Armor Units

n [(2)]

Placement

Breaking Wave

Nonbreaking Wave

Breaking Wave

Nonbreaking Wave

Slope cot ?

Quarrystone

Smooth rounded

2

Random

1.2 [(1)]

2.4

1.1 [(1)]

1.9

1.5 3.0 [(8)]

Smooth rounded

>3

Random

1.6 [(1)]

3.2 [(1)]

1.4 [(1)]

2.3(1)

1.5 3.0 [(8)]

Rough angular

1

Random [(3)]

__ [(3)]

2.9 [(1)]

__ [(3)]

2.3 [(1)]

1.5 3.0 [(8)]

1.9 [(1)]

3.2

1.5

Rough angular

2

Random

2.0

4.0

1.6 [(1)]

2.8

2.0

1.3

2.3

3.0

Rough angular

>3

Random

2.2 [(1)]

4.5 [(1)]

2.1 [(1)]

4.2 [(1)]

1.5 3.0 [(8)]

Rough angular

2

Special [(4)]

5.8

7.0

5.3 [(1)]

6.4

1.5 3.0 [(8)]

Parallelepiped [(9)]

2

Special

7.0 20.0

8.5 24.0 [(1)]

1.0 3.0

Tetrapod and Quadripod

5.0 [(1)]

6.0

1.5

2

Random

7.0

8.0

4.5 [(1)]

5.5

2.0

3.5 [(1)]

4.0

3.0

8.3 [(1)]

9.0

1.5

Tribar

2

Random

9.0 [(1)]

10.0

7.8 [(1)]

8.5

2.0

6.0

6.5

3.0

Dolos

2

Random

15.0 [(6)]

31.0 [(6)]

8.0 [(1)]

16.0 [(1)]

2.0 [(5)]

7.0

14.0 [(1)]

3.0

Modified cube

2

Random

6.5 [(1)]

7.5

5.0 [(1)]

1.5 3.0 [(8)]

Hexapod

2

Random

8.0

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