Runoff Volume Calculator


Calculating runoff volume is crucial in various fields, from civil engineering to environmental science. To simplify this process, a runoff volume calculator can be a valuable tool. In this article, we’ll provide a step-by-step guide on how to use a runoff volume calculator.

How to Use

Using the runoff volume calculator is straightforward. Enter the required parameters into the input fields, and with a click of the “Calculate” button, you’ll get the precise runoff volume. This tool is particularly useful for engineers, hydrologists, and anyone dealing with water management projects.


The runoff volume is typically calculated using the Rational Method formula:



  • Q is the runoff volume,
  • C is the runoff coefficient,
  • i is the rainfall intensity, and
  • A is the area of the watershed.

This formula provides an accurate estimate of the runoff volume based on the specific characteristics of the watershed.

Example Solve

Let’s consider an example where C=0.5, i=2in/hr, and A=100acres. Plugging these values into the formula:

By entering these values into the calculator, you should obtain the result, which will be explained later in the example code.


Q1: What is a runoff coefficient?

A1: The runoff coefficient is a measure of the fraction of rainfall that becomes runoff. It depends on factors like soil type, land use, and slope.

Q2: Can I use this calculator for any unit of measurement?

A2: Yes, as long as the units for runoff coefficient, rainfall intensity, and watershed area are consistent.

Q3: Is the Rational Method suitable for all situations?

A3: The Rational Method is a widely used approximation but may have limitations in certain complex hydrological scenarios.


Calculating runoff volume is essential for effective water management, and a runoff volume calculator simplifies this process. By following the steps outlined in this article, you can easily use and understand the runoff volume calculator. Feel free to customize the provided HTML and JavaScript code for your specific needs.

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