Basic water model use case (Water Overlay)
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.
This use-case assumes a basic water model with only above-surface flow.
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 | Pumps move water from locations with a lower water level to locations with a higher water level. | There are no default pumps in a project. |
| Inlets and outlets | Inlets are points where water can be added to the water system. Outlets are points where water can leave the water system. | There are no default inlets or outlets in a project. |
| Sewer areas | Sewer areas form controlled storage for water which ends up on constructions landing on sewer areas. | In the configuration wizard, it is possible to generate sewer areas based on the neighborhoods in the project area. |
| Sewer overflows | Sewer overflows are a way for water to flow out of the sewer, and back onto the surface water system. | There are no default sewer overflows in a project, even when sewers are loaded in or generated. |
Steps
- Add a new area by clicking in the bottom left corner.
- Select the newly created area (named Area) and give it a fitting name on the right
- Zoom in to the location where you want to have the breach and click on the Adjust area button
- 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.
- 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.