---
title: "How to add calibration data to river results | Tutorials"
slug: "how-to-add-calibration-data-to-river-results"
description: "Learn how to add calibration data to river results on Flood Modeller. "
tags: ["1D river modelling", "river section"]
updated: 2022-10-12T16:13:18Z
published: 2022-10-12T16:13:18Z
canonical: "help.floodmodeller.com/how-to-add-calibration-data-to-river-results"
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.

# How to add calibration data to river results

Calibration datasets are hugely important to reduce the uncertainty in model results. By comparing these known data values for specific events to results produced within Flood Modeller, a user can refine parameters to improve the accuracy of a model.

NoteFlood Modeller also provides options to [Create a river calibration dataset](/v1/docs/how-to-create-a-river-calibration-dataset)

To add calibration data to river results:

1. Plot the 1D river result of interest. This can be a *Time Series* or a *Long Section* plot.  
NoteYou may find these guides helpful: [How to plot a Long Section](/v1/docs/how-to-plot-animate-and-customise-a-long-section-of-1d-river-results), [How to plot a Time Series](/v1/docs/how-to-plot-animate-and-customise-a-time-series-of-1d-river-results)
2. Click the **Add/Remove results or calibration data** button (5th button from left in chart toolbar), or Ctrl+U on your keyboard, to return to the *Results Selection* window. NoteYou can also choose to add a calibration data file during the initial specification of the chart
3. Click **Add results/cal file(s)** and browse to your calibration data - for *Time Series* plots this will be in a file with extension .cal, for a *Long Section* plot this will be in a file with extension .cus. Then click **Plot** to view both datasets within the same graph.

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