---
title: "Runoff Coefficient Calculator"
canonical: "https://help.innovyze.com/space/infodrainage2020v2/16417294/Runoff%20Coefficient%20Calculator"
format: markdown
---
Allows the **Volumetric Runoff Coefficient **to be calculated from **Land Use** and **Overland Slope.**

![image](media://16e76ce6-58a7-4e2a-a02e-a10daa8caed7)

As options are selected from the drop down lists, the appropriate runoff coefficient is selected.

The runoff coefficient is calculated by looking up the values in table 1 in document , authored by the Oregon Department of Transportation Highway Division.

**Local guidelines may differ from the calculator values. Where values differ the locally recommended values should be used.**