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The exponent of the discharge-area rating: β.
b.
Gravity, friction, pressure gradient, and inertia. The wind force is missing from a conventional open-channel flow analysis.
c.
W/D > 10
d.
Under Manning friction, the neutral-stability Froude number is 2.
Minimum value of Manning's n: n = 0.008, applicable to acrylic plastic (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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