R' i
Vi
= 3.28 + 5.75 log
d 84
g R' i S
and the grain shear stress is calculated as:
τ 'i = γ R'i S
The CMT column consists of 6 columns of single letter codes. The first 3
columns define the flow type, which is considered to be rough if
4 Ri V i
k si
ν
≥ 50
C i Ri
where:
v = kinematic viscosity
If the flow is rough, an R appears in the third column. Otherwise T/S, standing
for transitional to smooth flow, appears in columns 1 through 3.
Other nomenclature in columns 1 through 3 are "V:O", indicating that this
panel has a vertical wall, and "DRY", indicating that there is no water in this
panel.
The fourth column is used to define the flow regime, if the Brownlie
equations are specified, or to identify that the SCS grass equations are being
used.
U - upper bed regime
T - transitional
L - lower bed regime
G - indicates the equation flagged in column 6 is a grass equation.
The last column indicates the roughness equation used for the panel.
B - Brownlie
K - Keulegan
L - Limerinos
M - Strickler (Manning)
A,B,C,D,E - various grass equations if the fourth column was a "G" .
At the bottom of the table are summaries. The numbers below the solid line
are totals for the column. The numbers below the dashed line are composite
values for the cross-section, calculated the same as in Table 8-1.
91
Chapter 6
Input Requirements and Program Output for SAM.hyd