---
title: "The Urban Pump and Flow-Regulator Links | Technical Reference"
slug: "the-urban-pump-and-flow-regulator-links"
description: "Learn about the urban pump and flow-regulator links used to connect the nodes in an urban network. "
tags: ["1D urban modelling", "orifice", "weir"]
updated: 2022-09-23T15:17:10Z
published: 2022-09-23T15:17:10Z
canonical: "help.floodmodeller.com/the-urban-pump-and-flow-regulator-links"
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.

# The  Urban Pump and Flow-Regulator  Links

**Pump** and Flow-Regulator (**Orifice**, **Weir** and **Outlet**) links are used to connect the nodes in an urban network. They allow the flow to be conveyed between their inlet and outlet nodes in alternative ways to the [Urban Conduit Link.](/v1/docs/the-urban-conduit-link)

In Kinematic Wave routing, these link types are only allowed as the outflow link from an [Urban Storage Node.](/v1/docs/the-urban-storage-node)

![UrbanNodesimagesflowreg.PNG](https://cdn.document360.io/5074bc26-a9ef-4bf4-b1de-a5c6ce628aca/Images/Documentation/UrbanNodesimagesflowreg.PNG)

#### Pumps

A **Pump** is a link that lifts water between nodes. We refer the user to the [EPA Manual](https://www.epa.gov/sites/default/files/2019-02/documents/epaswmm5_1_manual_master_8-2-15.pdf) for further details on the Pump link type.

---

#### Flow-Regulator links

**Orifice** and **Weir** links represent these features within an urban system, and convey flow using the orifice and weir equations respectively.

An **Outlet** link is used to specify flow not represented by a pump, orifice or weir.

We refer the user to the [EPA Manual](https://www.epa.gov/sites/default/files/2019-02/documents/epaswmm5_1_manual_master_8-2-15.pdf) for further details on each link type, including the equations used.