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If the flow is unsteady, it cannot be uniform.
Uniform flow has constant depth and velocity in time and space.
Unsteady flow is changing the depth and the velocity with time and space.
b.
W/D > 10
b.
A rating is a relationship between the discharge (x) and the stage, flow depth, or flow area (y).
d.
β varies from 3 for laminar overland flow, to 5/3 (Manning) and 3/2 (Chezy) in hydraulically wide channels, to 4/3 (Manning) and 5/2 (Chezy) in triangular channels,
to 1 in inherently stable channels, in which the hydraulic radius is a constant regardless of stage or flow depth.
e.
Minimun n= 0.008 --- acrylic glass (lucite).
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