Open Channel Rectangular Discharge
Use this open channel rectangular discharge tool when you have measured values for width, depth, velocity. It applies a transparent mathematical relationship to those values to return an answer in m³/s. Unlike a prediction or recommendation, this is a calculation from your inputs. Assumes uniform velocity; actual channels vary with depth. Enter a different scenario to see how this particular quantity changes; check the assumptions before using it in a project.
How to use this calculator
- Use exact measurements and consistent units for width, depth, velocity.
- Enter each quantity; blank, nonnumeric and out-of-range inputs are not accepted.
- Compare the reported m³/s quantity against your own data and the limitations below.
Formula for Open Channel Rectangular Discharge
m³/s = width*depth*velocity. Inputs are expressed in the units shown by the labels.
- This uses a direct fluid relationship and does not retrieve remote data, forecasts or individual account information.
- Assumes uniform velocity; actual channels vary with depth.
Worked examples
Worked example — Open Channel Rectangular Discharge
Enter Width = 2.5, Depth = 0.7, Velocity = 1.2.
Apply width*depth*velocity.
Calculated value: approximately 2.1 m³/s.
Understanding the result
The example produces about 2.1 m³/s; this is a mathematical output for the example inputs, not an observed result for your project.
Assumes uniform velocity; actual channels vary with depth.
Important notes
Assumes uniform velocity; actual channels vary with depth.
Use values from the same measurement period or physical system. The result is in m³/s and is not a guarantee of capacity, safety, ranking or revenue.
Frequently asked questions
What does Open Channel Rectangular Discharge calculate?
It converts width, depth, velocity into a quantity measured in m³/s using the stated formula.
Which assumption matters most?
Assumes uniform velocity; actual channels vary with depth.
How can I check this output?
Recalculate the worked example from the input quantities, confirm units and compare with direct measurements where available. This calculator does not fetch live data.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.