Rectangular weir flow rate calculator

This calculator can be used to determine the flow rate of water over a rectangular weir. It is based on the principles of fluid mechanics and is commonly used in hydraulic engineering.

Input Parameters

Calculation Results

Calculation Formula

Q = (2/3) * b * H3/2

Where:
Q = Flow rate (m3/s)
b = Weir width (m)
H = Head over weir (m)

Rectangular weir flow rate calculator Calculator Usage Guide

Learn how to use the Rectangular weir flow rate calculator and its working principles

How to Use the Calculator

  1. Enter the width of the weir in meters (m). This is the horizontal distance between the two sides of the weir.
  2. Enter the head over the weir in meters (m). This is the vertical distance from the water surface to the top of the weir.
  3. Click the "Calculate" button to compute the flow rate.
  4. The flow rate (Q) will be displayed in cubic meters per second (m3/s).

Working Principle

The flow rate over a rectangular weir can be calculated using the formula:

Q = (2/3) * b * H3/2

Where:

  • Q = Flow rate (m3/s)
  • b = Weir width (m)
  • H = Head over weir (m)

This formula is derived from the principles of fluid dynamics and is widely used in hydraulic engineering for measuring and controlling water flow.

Applications

This calculator is useful in various applications such as:

  • Water treatment plants
  • Hydroelectric power stations
  • Stormwater management
  • Agricultural irrigation systems