---
title: Hydraulic Capacity of Culverts
description: The most widely accepted formula for evaluating the hydraulic capacity of non-pressure sewers is the Manning Formula.
---

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# [Hydraulic Capacity of Culverts](https://resources.concretepipe.org/dd11-hydraulic-capacity-of-culverts)

 Written by [Design Data](https://resources.concretepipe.org/author/design-data) | 10/4/21 6:34 PM

## Design Data 11:  Hydraulic Capacity of Culverts

The most widely accepted formula for evaluating the hydraulic capacity of non-pressure sewers is the Manning Formula.

- Q = discharge in cubic feet per second
- n = Manning’s roughness coefficient
- A = cross-sectional area of flow in square feet
- R = hydraulic radius in feet (equals the area of the flow divided by the wetted perimeter)
- S = slope of pipe line in feet of vertical drop per foot of horizontal distance

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