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Re: Stable channel design(Hec-Ras3.1.3)
The grain size on the side slope is calculated the same way as the bed slope, only a reduction factor is applied to the critical shear stress. That is, it takes less shear stress to mobilize a given grain size on the side slope than an equivalent size on the bed. The reduction factor is a function of the side slope and the angle of repose of the grains. See Chapter 12 of the Hydraulic Reference Manual for more information.
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