The normal scour depth D below the designed flood level of river may be calculated from the Lacey’s equation, where C = Constant, Q = Design flood discharge and f = Silt factor

The normal scour depth D below the designed flood level of river may b

1.	The normal scour depth D below the designed flood level of river may be calculated from the Lacey’s equation, where C = Constant, Q = Design flood discharge and f = Silt factor
A.	D = C(Q/f)
B.	D = C(Q/f)1/2
C.	D = C(Q/f)5/3
D.	D = C(Q/f)1/3
Answer» E.