Introduction

This calculation tool is designed to help you quickly and accurately determine the hydraulic depth of a flowing body of water.

Calculation (Froude's Number)

⬇️ Inputs



V1 (m/s)
:5



D1
:3m


⬆️ Outputs



Fr1 (1)
:0.92167



Calculation (Hydraulic depth)

⬇️ Inputs



Fr2
:0.92



V2
:5


⬆️ Outputs



D2 (1)
:3.011


💬 We'd love your feedback on this template! It takes 1min

Explanation

The Froude number, Fr, is a dimensionless value that describes different flow regimes of open channel flow. The Froude number is a ratio of inertial and gravitational forces.
It's used in fluid dynamics to measure the relative importance of gravity and inertia forces in a flow. The Froude Number can range from 0 to infinity, with 0 representing a flow with no inertia and infinity representing a flow with no gravity.

The Froude number is calculated as the ratio of the inertial force of the flow to the gravitational force of the flow.


Where:

When:


The hydraulic depth can be solved by rearranging the formula to solve for flow depth. This is shown below: