Other results in Table 8-1 are calculated as follows:
Q
V=
∑ Ai
V
Froude Number =
EFD * g
τ =γ R S
where:
V = average velocity
_
EFD = effective depth
g = acceleration of gravity
τ = bed shear stress
γ = unit weight of water
Flow Distribution Table. Table 8-2 gives the flow distribution for each
panel of the cross section. The conveyance weighted discharge percentage for
each panel, Qi , is calculated by the following equation:
C A Ri
Qi = 100 Q i i
∑C A R
i
i
i
Area, wetted perimeter, and hydraulic radius are reported for each panel.
Panel hydraulic radius, Ri , is defined as Ai/Pi. ks and n are calculated or given
τ = γ Di S
where:
Di = average depth in the panel
If a bed gradation is specified, then τ in the table is the grain shear stress
calculated using a combination of the Manning and Limerinos equations, where
R' is the hydraulic radius associated with grain roughness and is determined from
the following:
90
Chapter 6
Input Requirements and Program Output for SAM.hyd
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