If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor down stream of the crestwall, is given by the equation
According to Kennedy, the critical velocity (V0) in
metres in a channel is the mean velocity which keeps the channel free
from silting or scouring. Its value is given by (where m is critical velocity ratio and D is the depth of the channel).
Answer : Option B