---
title: "Working with Junction nodes | Tutorials"
slug: "working-with-junction-nodes"
description: "Read all about working with junction nodes."
tags: ["1D urban modelling", "junction"]
updated: 2022-08-03T09:00:40Z
published: 2022-08-03T09:00:40Z
canonical: "help.floodmodeller.com/working-with-junction-nodes"
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.

# Working with Junction nodes

Multiple outflow pipes from a junction are  allowed if using Dynamic Wave routing.

If using Steady or Kinematic Wave routing, only a single outflow pipe (link) is allowed from a Junction node  (a  [Flow-Divider](/v1/docs/urban-structures-and-features) node may be suitable if two outflow pipes are required).

The Junction node **Properties Window** is shown below.

![1DUrbanimagesurbanjunction.PNG](https://cdn.document360.io/5074bc26-a9ef-4bf4-b1de-a5c6ce628aca/Images/Documentation/1DUrbanimagesurbanjunction.PNG)

Click in the  **Name** field, type a new name and press the Enter key on your keyboard to adjust the label provided to your junction. This is populated by default based on values set on the **Model Defaults** window, recall how to edit these defaults from the  [Urban Networks](/v1/docs/1d-urban-networks) section.  Note that if you change the name of a node, this label will be automatically updated in any connecting links so there is no further work to be done.

The **X-coordinate** and **Y-coordinate** are automatically filled based on the node location in the **map** view.

A **Description** and/or **Tag** can be optional provided. You may find tags  helpful to group components together - this can be a way to categorise specific nodes. To edit these, click  in relevant the  field, type  a new value, and press  the Enter key.

External **Inflows** can be defined and allowed to enter Junction nodes. Please refer to the [Urban Inflow](/v1/docs/1d-urban-flow) page for further details.

Addition of pollutants to specify   **Treatment** is not currently available within the software, although pre-defined pollutants will be unaffected. 

The general node parameters can all be edited by  clicking in relevant the  field, typing  a new value, and pressing the Enter key.  The **Invert Elevation** and **Maximum Depth** of the Junction node are  populated by default based on values set on the **Model Defaults** window, recall how to edit these defaults from the  [Urban Networks](/v1/docs/1d-urban-networks) section. The **Initial Depth** and **Surcharge Depth** will both be zero by default.

The **Ponded Area** can also be set in the model defaults. If non-zero, this allows water that leaves the Junction node to be stored so that it can subsequently return to the urban network. This parameter  needs to relate to your grid size if [Integrating urban networks with 2D components](/v1/docs/integrated-modelling-overview).