Basic water model use case (Water Overlay)

Please note: This page is currently being updated.

For all effective uses of any variant of the water overlay, you must first set up a basic water model. This water model includes boeth your hydrological system, as well as the parameters used to perform any calculations. The behavior of any water, whether it's pre-existing, expected inflow, or due to natural event or calamity, is affected by the presence of features which can capture or steer water in other directions. The more real-world hydrological features and hydrological constructions are loaded in, the more accurately the water flow can be simulated.

Requirements

The first step is preparing your data. Note that data can be skipped if you do not have this data, or the data is not applicable for your project. The following data should be prepared:

Data	Description	Alternative/default
Water areas	Water areas set the water level of all open water in the area they envelop.	In the configuration wizard, it is possible to generate a single water area for the entire project area.
Weirs	Weirs allow for water to flow between bodies of water, with the amount of water increasing as the water level increases.	There are no default weirs in a project
Culverts	Culverts allow for water to flow between bodies of water, with a maximum amount dictated by the size of the culvert.	For projects in the Netherlands some culverts may be loaded in as part of the project creation process.
Pumps
Inlets and outletss
Sewer areas
Sewer overflows		<--
Ground water	Only relevant for groundwater overlays. Will set the height of the saturated zone's water in the underground.	The groundwater overlay will assume the entire ground is saturated. Other overlays will not use the underground water model.
Aquifers		-->

Steps

How to prepare your data:

1. Add a new area by clicking in the bottom left corner.
2. Select the newly created area (named Area) and give it a fitting name on the right
3. Zoom in to the location where you want to have the breach and click on the Adjust area button
4. Select the location of your breach and click on Apply settings. Make sure the breach is not connected to the water body and ideally draw it on the inside of the dike.
5. Go to the tab attributes and add the breach floor attribute and the outlet capacity. The outlet capacity is the volume of the waterbody. Also add either the outlet Q or the outlet level to determine how much water will flow through the breach.

• Prepare data
• Prepare properties
• Prepare result types

Use the steps described on the How to configure a Water Overlay page, to create the initial model.