1V:ZH -- definition of the side slopes, with the Z as the input parameter
CD1 -- the height of the low flow channel
CD2 -- the incremental height of the normal channel
CD3 -- the incremental height of the high flow channel
BW1 -- the width, toe to toe, of the low flow channel
BW2 -- the width, toe to toe, of the normal channel
BW3 -- the width, toe to toe, of the high flow channel
Note: therefore total depth = CD1+CD2+CD3
Figure 6.9. Definition of input for bottom calculations for compound channels.
Bottom Width Calculations: Input and Output
Bottom width of a simple or compound channel can be determined with this
option. Roughness and compositing are handled the same as described for
normal depth calculations. Bottom width becomes the dependant variable in the
Manning equation:
W = f(Q, n, D, z, S)
where
W = bottom width
Q = water discharge
n = n-value
D = water depth
z = side slopes of the channel
S = energy slope
93
Chapter 6
Input Requirements and Program Output for SAM.hyd
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