---
title: "Runoff Coefficient Calculator"
canonical: "https://help.innovyze.com/space/infodrainage2021v1/16548357/Runoff%20Coefficient%20Calculator"
format: markdown
---
Allows the **Volumetric Runoff Coefficient **to be calculated from **Land Use** and **Overland Slope.**

![image](media://c9c4a7f5-db94-40e4-8929-3bed48b0ddd2)

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.**