velocity
returns the mean flow velocity (m/s) for a given hydraulic
radius, bed surface D84, and reach average gradient using Ferguson (2007)
1 | velocity(R, S, D84)
|
R |
hydraulic radius for channel cross section (m) |
S |
reach average channel gradient (m/m) |
D84 |
84th percentile of bed surface in main channel (mm) |
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