Al used in forming clay minerals Hydration water added to mineral, eg. It results from turbulent momentum transfer. Transition between 500 and 2000 depending on boundary conditions such as channel depth and geometry. R e is dimensionless, used to compare scaled-down models.
L is d cm instead of water depth.
Important in erosion and transport. Froude Number Role of gravity forces in flow, especially where gravity instead of stream head determine flow. If F r is less than 1 then flow is tranquil and the velocity that surface waves move is greater than flow velocity, thus waves can move upstream. F r greater than 1 results in rapid flow. Both rapid and tranquil flows can be turbulent.