We know 
Critical Velocity is expressed as 
V₀ = 0.55 m D^0.64 
Where, m = Critical Velocity ratio (CVR) and it is equal to the ratio of actual velocity (V_a) to critical velocity (V_c) in channel.
Now If, 
CVR > 1; V_a > V_c - Scouring will occur 
CVR < 1; V_a < V_c - Silting will occur 
CVR = 1; V_a = V_c - There will be no silting and scouring 
or V₀ = C × Dⁿ
Where, D is full supply depth in m and C is constant. 
Note:
Constant C depends on the character of the silt. Coarser the material greater the value of the constant. 
Values of C (the constant in Kennedy's Eq.) and m (the Critical Velocity Ratio, CVR) for various grades of silt

Type of silt grade	C	m
Coarser silt	0.7	1.3
Sandy loam silt	0.65	1.2
Coarse light sandy silt	0.59	1.1
Light sandy silt	0.53	1.0