---
title: "Define river section special markers"
slug: "how-to-define-special-markers-in-a-river-section"
description: "Watch the video on how to define special markers in a river section. "
tags: ["1D river modelling", "river section"]
updated: 2022-08-04T05:48:33Z
published: 2022-08-04T05:48:33Z
canonical: "help.floodmodeller.com/how-to-define-special-markers-in-a-river-section"
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.

# Define river section special markers

Special markers in **River Section** nodes are often used purely for information purposes, however they can also be used in conjunction with other tools to edit river networks.

To add special markers to a River Section:

1. Open the **River Section** of interest
2. In the table of cross-sectional data, locate the row to add the special marker. Note that you can plot the cross-sectional data, then click within the plot to select a location, and the relevant row will be automatically highlighted.
3. The field for special markers is on the far right of the row. Click on the icon with **3 dots** to the right of the field.
4. A new window will open with a variety of special markers displayed.
5. Check the box of the special marker(s) to add at this location and click **OK**.
6. A non-zero value will now show in the special marker field for that row.
7. Click **OK** to close the **River Section** and ensure you save the changes to your river network.

[YouTube video player](https://www.youtube.com/embed/uXrU5cHi4mg)