---
title: "Base Flow"
canonical: "https://help.innovyze.com/space/infodrainage2021v2/16678926/Base%20Flow"
format: markdown
---
A constant flow can be applied to the system using the** Base Flow Inflow** type. A Base Flow is a simplified [input hydrograph](https://help-innovyze.atlassian.net/wiki/spaces/infodrainage2021v2/pages/16679009). The Base Flow type can be selected from the Build Ribbon or from the Toolbox under Inflows. 

## Runoff


> ⚠️ In Foul phases the pollution tab is not available

![image](media://1d7d0a98-f089-46c7-8636-4ee4fbe0956d)

### Flow

A constant flow rate.