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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.
Gravity, friction, pressure gradient, and inertia.
c.
W/D > 10
d.
Under Manning friction, the neutral-stability Froude number is 1.5.
e.
Minimum value of Manning's n: n = 0.008, applicable to acrylic glass (lucite®)
Maximum value of Manning's n: n = 1, applicable to the
Everglades flow modeling, in Southern Florida.
Seddon waves are kinematic, with small dimensionless wavenumber;
Lagrange waves are dynamic, with large dimensionless wavenumber.
They are the same for Vedernikov number V = 1.
For a hydraulically wide channel, the critical slope is the
same as the dimensionless Chezy friction factor, that is,
1/8 of the Darcy-Weisbach friction factor.
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