Drainage Slope Design Calculator

Drainage Slope Design Calculator calculator can be used to determine the required slope for a drainage pipe based on the desired flow rate and pipe diameter.

Input Parameters

Calculation Results

Calculation Results

Required Slope (S) = 0.00 m/m

Calculation Formula

S = (Q / (n * A * R^(2/3)))²

Where:
S = Slope of the pipe (m/m)
Q = Flow Rate (m³/s)
n = Manning's Coefficient
A = Cross-sectional Area of the pipe (m²)
R = Hydraulic Radius (m)

Drainage Slope Design Calculator Calculator Usage Guide

Learn how to use the Drainage Slope Design Calculator calculator and its working principles

Calculator Function

This calculator is used to determine the required slope for a drainage pipe based on the desired flow rate and pipe diameter. The slope is calculated using Manning's equation, which is commonly used in fluid dynamics to describe the flow of water in open channels and pipes.

How to Use the Calculator

  1. Enter the desired flow rate (Q) in cubic meters per second (m³/s).
  2. Enter the diameter of the pipe (D) in meters (m).
  3. The Manning's coefficient (n) is typically 0.013 for concrete pipes, but you can adjust it based on the material of your pipe.
  4. Click the "Calculate" button to compute the required slope.
  5. The result will be displayed in meters per meter (m/m).

Understanding the Results

The required slope is the minimum slope needed for the water to flow through the pipe at the desired flow rate. A steeper slope will result in faster flow, while a gentler slope will result in slower flow. It's important to ensure that the slope is sufficient to prevent water from backing up and causing flooding.

Example

If you need to design a drainage pipe with a flow rate of 0.1 m³/s and a diameter of 0.5 meters, using a Manning's coefficient of 0.013, the calculator will determine that the required slope is approximately 0.017 m/m.