Other portions of the bank were lined with sandbags filled with air-pruned grasses interspersed with air-pruned trees. The sandbags hold soils in place long enough for the grass and tree root systems to become established. Then, air-pruned root systems hold soils in place and the grasses and trees provide roughness which dissipate energy.
Bank roughness from grasses and trees dissipates energy, which slows velocities and allows sediments to drop out of flow building banks instead of eroding them.
This narrow, high velocity stream was experiencing severe erosion. Portions of the bank were lined with riprap for protection.
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