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The exponent of the discharge-area rating: β.
b.
Gravity, friction, pressure gradient, and inertia.
c.
T/D > 10
d. They are both related to the acting force; energy is the integral of force over space;
momentum is the integral of force over time.
F = 2.
F = 2.
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.
To actually backcalculate the Manning n by measuring discharge Q,
flow area A, wetted perimeter P, and channel slope S.
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