Discussion
Match each overtopping assessment quantity with what it measures.
List I
A. Mean discharge
B. Maximum individual volume
C. Number of overtopping waves
D. Overtopping velocity
List II
1. how many waves pass the crest
2. average flow rate per metre run of crest
3. the speed of water arriving behind the crest
4. the largest single overtopping event
Answer: B
Correct answer: A-2, B-4, C-1, D-3
The four quantities answer different questions. The mean discharge, in litres per second per metre run, is what limits are set against. The maximum individual volume matters for the safety of a person or a vehicle, since one large event can be lethal where the mean is acceptable. The number of overtopping waves indicates how often the crest is wetted. The velocity determines the force on anything standing behind.
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