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Note that actual roots are gone. This eroded bank at a curve was rebuilt over tree trunks laid as a continuous row on a log at the proposed edge. All the other trunks and all the fill material have been washed away in the first year, see new grass on patches of remaining slope. This is how Root Wad revetment is supposed to look. Tree trunks were rammed into the bank in a continuous row, with roots facing slightly upstream.