What is defined as non-uniform flow?

• A. Depth changes at every section
• B. Flow velocity remains constant
• C. Pressure is constant
• D. Flow is laminar

Answer: (A)

Non-uniform flow is characterized by variations in flow properties, such as velocity, depth, or pressure, at different points along the flow direction. When the depth changes at every section, it indicates that the flow conditions are not consistent throughout the channel. This results in a variation in the flow characteristics, making it non-uniform.

In contrast, if the flow velocity remains constant, pressure is constant, or the flow is laminar, those conditions would imply a more uniform flow scenario. In a uniform flow, the flow properties remain constant across sections, whereas in a non-uniform flow, those properties can change. Thus, the significant factor defining non-uniform flow is indeed the change in depth, indicating variations in other flow parameters throughout the channel.