---
title: "Add z-mod features to a simulation"
slug: "how-to-add-z-mod-features-to-a-simulation"
description: "Learn how to add zmod features to your 2D and linked simulations"
updated: 2023-06-21T14:07:26Z
published: 2023-06-21T14:07:26Z
canonical: "help.floodmodeller.com/how-to-add-z-mod-features-to-a-simulation"
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.

# Add z-mod features to a simulation

Modifying the elevation of an area within your model can be used for specifying elevations for proposed defences, filling holes/areas of missing data in your underlying DTM, and much more.

When your z-mod features are complete, they can be quickly and easily added to simulations.

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

### Steps

1. Open the simulation. In the **Domains** tab, drag your shapefile (providing the z-mod area) from the **Layers** panel to the **Add Z Mod** button provided to the right of the **Topography** field.

Note:

Alternatively, click the **Add Z Mod** button to open a file explorer window and browse to the relevant file.
2. The **Select z-mod topography files** window will open. Drag the point shapefile (providing the vertices and heights for the z-mod area) from the **Layers** panel into the field provided. Buttons to **Add** and **Remove** z-mod files are also provided to the right of this field.
3. Provide a **Description** for your z-mod feature in the field provided and click **OK**. The **Topography** field in the simulation window will now show your description followed by all files used in parenthesis.

Note:

You can add z-mod areas, lines and points (in separate shapefiles) located within the z-mod area. Data from area vertices take precedence over data from line vertices, which in turn take precedence over data from point vertices.
4. Don't forget to **Save** the simulation.