How to model drainage (Water Overlay)
When using the Water Overlay to calculate groundwater, the presence of drainages can have a strong impact on the results. Drainages can be modeled using the drainage Building, and can be configured as either active drainages or passive drainages.
Drainages can be configured
Manually adding a drainage
How to manually create drainages:
- Add a new underground Building to the Project.
- Set the Building's Function to either "Active Drainage" or "Passive Drainage".
- Draw the Building in the 3D Visualization in the location where the drainages are. Ensure the drainages are drawn only under solid land.
- Draw another polygon for the Building in the water where the drainage drains into (without removing the section drawn previously). Ensure it is not drawn over the water's edge.
- Open the Water Overlay's Water Overlay Wizard, and continue to the step concerning drainages.
- Configure the drainage's attributes as desired.
Preparing and importing drainage data
Editor → Current Situation (Ribbon tab) → Overlays (Ribbon bar) → your Water Overlay (Left panel) → Configuration Wizard (Right panel)
How to prepare and load in drainage data:
- Ensure that each drainage has at least 2 polygons: one drawn only under land, and one drawn only in the waterway it should drain into. Ensure no individual polygon overlays with both land and water, or the water's edge.
- Ensure all Attributes pertaining to drainages are configured correctly.
- Export the data as GeoJSON.
- Open the Water Overlay's Water Overlay Wizard, and continue to the step concerning drainages.
- Opt to import new data, and import your drainages file.
Notes
- Drainages function across their entire polygon. In reality, drainages are discrete tubes; between them, water flows at normal underground speed. For maximum accuracy, model each tube as a separate polygon. However, drawing the drainage as one uninterrupted area still achieves the sped-up flow effect with minimal loss of detail.