Q.

               is the velocity with which water reaches the notch or before it flows over it.

A. velocity of contact
B. velocity of moment
C. velocity of approach
D. velocity of head
Answer» C. velocity of approach
Explanation: the velocity of approach is defined as the velocity with which water reaches the notch or weir before it flows over it. this velocity of approach creates an additional head “ha” equal to va2 / 2g and effect head over the notch is increased to h+ha.
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