The critical tractive force (shear stress) acting on an alluvial canal bed in Lacey’s regime theory is proportional to:
AUnit weight of water * Hydraulic radius * Channel slope (gamma_w * R * S)
BDischarge / Velocity
CSilt factor / Grain size
DFroude number squared
Explanation
Hydrodynamic boundary shear stress acting on canal bed is tau_0 = gamma_w * R * S.

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