Demo Breach Project

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An overview of Demo Breach.

The Demo Breach project is available for all users and can be found in the main menu under Edit projects. This project does not count towards your license.

This project is intended for hydrologists and other water experts.

This project showcases the flooding overlay in a basic setup with a breach.

The demo is a working project in which a location in The Netherlands experiences a breach in a levee holding back a large amount of water. It can serve to explore how breaches are modeled in the Water Module, how they are configured, and how the consequences of a flooding can be analysed. The project simulates a breach which grows over time, allowing as much water to flow through as the lake contains and the dynamic size of the breach allows over a 1 hour period.

Exploring the project

Analyse the project:

1. Click on the arrows in the project to get familiar with the boundary conditions in the model.
2. Go to the Flooding Overlay (named Flooding) in the Overlay bar. Play the flooding overlay and notice how the water flows for example, around the Culvert. This overlay shows the Surface last value result type. Another interesting result type to study is the Surface last speed.
3. Go to the Base types result type, zoom in on the breach location and play the overlay to see how the breach grows over time. The light red area is the active breach area, the dark red area is part of the whole breach area. This is the available space for the active breach to grow depending on the set simulation time, the critical speed and the breach width.
4. Take a look at the Surface elevation result type. This height data is used for the Water Overlay calculations. If you focus on the breach area, you can clearly see what the breach area does: lowering the terrain height so that water can flood the surface.
5. Click on the Area menu in the Current Situation tab and select the area: breach in the left panel. In the right panel, select the attributes tab, focus on the attributes and their meaning. Especially the attributes relating to the external area. Since the project area is quite small it does not contain the whole body of water (Ijsselmeer). With no additional settings only the water in the project area would be used as the amount of water which can flow through the breach. Since we would like a more 'realistic' model, the breach area is configured with external area attributes. These attributes enable the use of the Ijsselmeer's whole capacity, without having to create a large project. See the following pages for an explanation of the attributes: External area, External surface level and External Water level.
6. Open the flooding wizard and take a look at the settings for the flood event, breach, culvert and output overlays.

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