I am looking at alternative linings (other than riprap) for an auxiliary spillway for a small embankment dam. I am thinking along the lines of a vegetated TRM. As a first look, I calculate the velocity and shear stress in the downstream section of the spillway to use as a guide for selecting a lining. For the spillway section across the embankment, however, the slope is zero, and as I understand it the shear stress would be zero by definition. Is this right or am I misguided here?
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