Partial pipe flow calculator

This calculator determines the flow rate through a partially filled pipe based on pipe diameter, liquid depth, and velocity.

Input Parameters

Calculation Results

Calculation Formula

Q = A × v

Where:
Q = Flow Rate (m³/s)
A = Cross-sectional area of flow (m²)
v = Flow velocity (m/s)

Cross-sectional Area of Flow (m²):

Flow Rate (m³/s):

Partial pipe flow calculator Calculator Usage Guide

Learn how to use the Partial pipe flow calculator calculator and its working principles

How to use the calculator

  1. Enter the pipe diameter in meters (m).
  2. Enter the liquid depth in meters (m).
  3. Enter the flow velocity in meters per second (m/s).
  4. Click the "Calculate" button to compute the cross-sectional area of flow and the flow rate.
  5. The results will be displayed in the respective fields.

Understanding the formula

The calculator uses the following formula to determine the flow rate:

Q = A × v

Where:

  • Q is the flow rate in cubic meters per second (m³/s)
  • A is the cross-sectional area of flow in square meters (m²)
  • v is the flow velocity in meters per second (m/s)

Principle of operation

This calculator calculates the flow rate through a partially filled pipe. The cross-sectional area of flow is determined by the liquid depth in the pipe. The formula used accounts for the circular segment area formed by the liquid surface in the pipe.

Example

If you have a pipe with a diameter of 0.5 meters and the liquid depth is 0.2 meters, with a flow velocity of 1.5 m/s, the calculator will determine that the cross-sectional area of flow is approximately 0.0491 m², resulting in a flow rate of 0.0737 m³/s.