Critical depth ($y_c$) is the depth at which an open channel flow is in a unique state of balance between its kinetic energy (velocity) and its potential energy (depth).

For open channel flow, given a channel shape and flow rate, flow can usually exist at two different depths, termed subcritical (slow, deep) and supercritical (shallow, fast). The exception is at …

In this article, we will discuss the concept of critical flow, including the calculation of critical depth for different channel shapes, the significance of Froude number in determining flow regimes, …

Mar 2, 2020 · With uniform flow, the channel slope at which critical depth occurs is known as the critical slope (Sc). The magnitude of critical depth depends only on the discharge and the …

May 8, 2025 · Critical depth is the specific point at which flow in an open channel has the least energy for a given discharge and marks the boundary between subcritical and supercritical flow.

Flow in an open channel is critical when the Froude number of the flow is equal to unity. Critical flow in a channel depends on the discharge and the geometry of channel section.

Critical depth of flow is a function of discharge and channel geometry. For a given discharge and simple cross-sectional shapes, only one critical depth exists.

Critical depth is defined as the flow depth at a section in an open channel where the flow is critical. It is used to classify the channel profile and to determine if the flow is subcritical or …

For a given value of specific energy, the critical depth gives the greatest discharge, or conversely, for a given discharge, the specific energy is a minimum for the critical depth.

Mar 24, 2003 · When flow is near critical, a small change in specific energy, bed roughness or bed slope produces relatively large changes in depth. Critical depth is a point of instability in the …