Bank stability increases in the presence of deeply rooted plants. A channel has a definite bed and banks that confine the water.
Culverts are often round but can be other shapes as well.
Individual baskets are tied together to form retaining walls and erosion resistant surfaces. The term can refer to any size of particles but is often used to indicate only fragments smaller than 6 mm. Such material may travel long distances down slope before coming to rest. To so move such material. A silt curtain is used to isolate an active construction area within a lake or wetland and prevent silt-laden water from migrating out of the construction zone.