---
title: "Conduit Channel Conveyance | Technical Reference"
slug: "conduit-channel-conveyance"
description: "Find the technical reference section for conduit channel conveyance, calculated by Manning's or the Colebrook White equation. "
tags: ["1D river modelling", "conduit", "error messages and diagnostics", "Manning's n"]
updated: 2022-08-23T17:41:08Z
published: 2022-08-23T17:41:08Z
canonical: "help.floodmodeller.com/conduit-channel-conveyance"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://help.floodmodeller.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Conduit Channel Conveyance

Conduit channel conveyance can be calculated using Manning's equation or the Colebrook White equation.

## Manning's Equation

|  | \| k2 = A2 R4/3 / n2 \| (1) \| \| --- \| --- \| where: n = Manning's roughness coefficient R = hydraulic radius = (A/P) |
| --- | --- |
| k2 = A2 R4/3 / n2 | (1) |

## The Colebrook White Equation

|  | \| k2 = 8 g R A2 / f \| (2) \| \| --- \| --- \| where f is a solution to the equation: \| 1/<font class="hcp5" face="Symbol" style="font-family: Symbol;" data-tomark-pass="">Ö</font>f = -2log10{(n / 14.83R) + (2.52 / Re <font class="hcp5" face="Symbol" style="font-family: Symbol;" data-tomark-pass="">Ö</font>f)} \| (3) \| \| --- \| --- \| and: Re = Reynolds number R = hydraulic radius = (A/P) P = wetted perimeter |
| --- | --- |
| k2 = 8 g R A2 / f | (2) |
| 1/<font class="hcp5" face="Symbol" style="font-family: Symbol;" data-tomark-pass="">Ö</font>f = -2log10{(n / 14.83R) + (2.52 / Re <font class="hcp5" face="Symbol" style="font-family: Symbol;" data-tomark-pass="">Ö</font>f)} | (3) |