Weir Flow Calculator

Weir Flow Calculator calculator can be used to calculate the flow rate over a broad-crested weir.

Input Parameters

Calculation Results

Calculation Formula

Q = (2/3) * Cd * sqrt(2g) * L * H^(3/2)

Where:
Q = Flow rate (m³/s)
Cd = Discharge coefficient
g = Acceleration due to gravity (9.81 m/s²)
L = Length of weir (m)
H = Head over weir (m)

Weir Flow Calculator Calculator Usage Guide

Learn how to use the Weir Flow Calculator calculator and its working principles

How to Use the Weir Flow Calculator

The Weir Flow Calculator is used to determine the flow rate over a broad-crested weir. Follow these steps to use the calculator:

  1. Enter the discharge coefficient (Cd). The typical value for a broad-crested weir is 0.6.
  2. Enter the length of the weir (L) in meters.
  3. Enter the head over the weir (H) in meters.
  4. Click the "Calculate" button to compute the flow rate.
  5. The flow rate (Q) will be displayed in cubic meters per second (m³/s).

Working Principle

The flow rate over a broad-crested weir is calculated using the formula:

Q = (2/3) * Cd * sqrt(2g) * L * H^(3/2)

Where:

  • Q is the flow rate in cubic meters per second (m³/s).
  • Cd is the discharge coefficient.
  • g is the acceleration due to gravity (approximately 9.81 m/s²).
  • L is the length of the weir in meters.
  • H is the head over the weir in meters.