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SUBJECT
In Rapidly Varied Flow (R.V.F), a sudden change of depth occurs at a particular point of a channel and the change from one depth to another takes place at a distance of very short length.
The gradually varied flow (GVF) is defined as steady non- uniform flow, where the depth of flow varies gradually from section to section along the length of channel. (A steady non-uniform flow in a prismatic channel with gradual changes in its water surface elevation is termed as gradually varied flow (GVF).
Energy depth relationship is the third chapter of the open channel flow. Detailed discussion about specific energy, critical depth, relationship between specific energy and depth of flow, section factor z, relation between discharge & depth of flow, channel transition.
A flow in an open channel is said to be uniform if its properties remain constant with respect to space. Detailed discussion about Uniform Flow.
There are many types of soil. Examples - Alluvial soil, Lacustrine soil, Marine soil, Aeolian soil, Glacial soil, Colluvial soil, Loess soil, Marl soil & others.
The process of formation of soil is termed as PEDOGENESIS. Soil is formed due to the weathering (erosion /wear and tear) of rocks. Weathering of rock can occur either physically or chemically.