---
title: Outlet Expansion
description: This paper describes the concept of using an abrupt expansion at the outlet end of a concrete culvert for the purposes of outlet velocity reduction.
---

[ACPA Resources ](https://resources.concretepipe.org)

# [Outlet Expansion](https://resources.concretepipe.org/outlet-expansion)

 Written by [Design](https://resources.concretepipe.org/author/design) | 11/7/22 9:20 PM

## Culvert Velocity Reduction with an Outlet Expansion

This paper describes the concept of using an abrupt expansion at the outlet end of a concrete culvert for the purposes of outlet velocity reduction. The method is intended for culverts operating under conditions of outlet control at maximum discharge. A model test program was set up to establish the design requirements for the expansion, and experimentally verify the performance. The results of this research are also presented.

   
 

[View full post](https://resources.concretepipe.org/outlet-expansion)

```json
{
  "@context" : "http://schema.org",
  "@type" : "BlogPosting",
  "author" : {
    "@type" : "Person",
    "name" : "Design"
  },
  "dateModified" : "2023-02-28T20:04:57.438Z",
  "datePublished" : "2022-11-07T21:20:24Z",
  "headline" : "Outlet Expansion",
  "image" : {
    "@type" : "ImageObject",
    "height" : 300,
    "url" : "https://9491265.fs1.hubspotusercontent-na1.net/hubfs/9491265/Images/ACPA/Website/Featured-Images/ACPA-Website-Featured-Image-Design-Outlet-Expansion-1.png",
    "width" : 360
  },
  "mainEntityOfPage" : "https://resources.concretepipe.org/outlet-expansion",
  "publisher" : {
    "@type" : "Organization",
    "logo" : {
      "@type" : "ImageObject",
      "height" : 60,
      "url" : "/hs/hsstatic/content_shared_assets/static-1.4092/img/default-amp-logo.png",
      "width" : 60
    },
    "name" : "ACPA Resources"
  }
}
```