Discussion
The damage parameter S in the Van der Meer formulae represents
Answer: A
Correct answer: the eroded area divided by the square of the unit size
The damage parameter is
\[ S = \frac{A_e}{D_{n50}^2} \]the cross-sectional area eroded from the profile, normalised on the square of the nominal unit diameter, so it expresses damage as the number of unit-sized volumes removed per unit length. Values of 2 to 3 mean the start of damage, 8 or more approaching failure, and the acceptable figure depends on the slope and on the consequence of repair.
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