---
title: "River Section Nodes | Tutorials"
slug: "river-section-nodes"
description: "Learn about how to set the selection mode in Flood Modeller, as well as general functionality and optional features."
tags: ["1D river modelling", "river section"]
updated: 2022-10-21T13:51:48Z
published: 2022-10-21T13:51:48Z
canonical: "help.floodmodeller.com/river-section-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.

# River Section Nodes

A river network will likely consist of multiple **River Section** nodes. These provide important information about the underlying channel and allow the water to be routed between them.

Recall to work on a loaded river network, you must ensure you have **Selection Mode** set to **1D River**.

#### How to set the Selection Mode

**Selection Mode** is displayed at all times at the bottom of the map view. When building and editing **1D river** networks, you must be in 1D River selection mode. Right-click anywhere on the **Map** view to access a menu allowing you to adjust the selection mode.

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

Selection mode can also be turned on and off using the toggle provided on the **1D Urban Build tab**.

![](https://cdn.document360.io/5074bc26-a9ef-4bf4-b1de-a5c6ce628aca/Images/Documentation/Selectionmode2.png)

---

### General Functionality

Flood Modeller provides functionality to [Add a River Section](/v1/docs/add-river-section) manually to your river network (although this may not be the most efficient way to produce your River Section nodes, see below for further details).

Right-click menus enable you to easily [Move a River Section](/v1/docs/move-river-section) to a new location, or [Delete a River Section](/v1/docs/delete-river-section) altogether if needed.

The guide [Working with River Section nodes](/v1/docs/working-with-river-section-nodes) details many of the parameters and options available, however it is still recommended you read the sections below for further information.

### Necessary Data

The **channel geometry** is an important aspect that must be provided.

If you [Add a River Section](/v1/docs/add-river-section) manually, the required cross-sectional data must be entered manually when [Working with River Section nodes](/v1/docs/working-with-river-section-nodes).

Additionally to this manual approach, if you have ground data available in an appropriate GIS format then you can efficiently [Create River Sections from the map.](/v1/docs/cretate-river-sections-from-the-map)

Options are also provided to [Import EACSD cross-sectional data](/v1/docs/eacsd-import) and [Import HEC-RAS cross-sectional data](/v1/docs/importing-hec-ras-cross-sections).

Alongside the cross-sectional data, the **roughness** of the channel must be specified for each River Section.

One option here is to enter the roughness for a specific River Section when [Working with River Section nodes](/v1/docs/working-with-river-section-nodes). A second option is to [Globally edit roughness](/v1/docs/how-to-globally-edit-roughness-of-river-section-nodes) for multiple nodes.

The **connectivity** of your River Sections is also important. When multiple River Section nodes are added to a network, a line will automatically appear on the map indicating the order of connectivity.

When [Working with River Section nodes](/v1/docs/working-with-river-section-nodes), we can adjust this order of connectivity as required. We can also enter the positive **distance to next** value required between two consecutive River Sections.

### Optional Features

Where georeferencing is available, this can be entered in the River Section properties. Functionality is provided to [Georeference River Sections](/v1/docs/georeference-river-sections) where this information is not available.

Panel markers, levees and other features can be specified when [Working with River Section nodes](/v1/docs/working-with-river-section-nodes).

You may also be interested in [Extending River Cross-Sections](/v1/docs/extend-river-sections) into the floodplain where this is required.

### Alternatives

An alternative to using River Section nodes within a network is to instead define sections for the [Muskingum Routing](/v1/docs/muskingum-routing) method. This is recommended for advanced modellers only.