How to model drainage (Water Overlay): Difference between revisions

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When using the [[Water Overlay]] to calculate [[groundwater model (Water Overlay)]] situations, the presence of drainages can have a strong impact on the results. Currently, drainages are not an available [[hydraulic structures (Water Overlay)|hydraulic structure]]. Instead, the effects of drainages can be approximated using [[Aquifer (Water Overlay)|Aquifer]]s, configured with a low resistance and set to the height of the drainages.
When using the [[Water Overlay]] to calculate groundwater, the presence of [[Drainage (Water Overlay)|drainage]]s can have a strong impact on the results. Drainages can be modeled using the [[Drainage (Water Overlay)|drainage]] [[Building]], and can be configured as either active drainages or passive drainages.


{{editor location|areas}}
Drainages can be configured
Note that these steps assume the [[Overlay Key]]s are set to the default [[Attribute]]s.
 
{{howto|title=manually create a drainage-approximating aquifer
==Manually adding a drainage==
| Add a new [[Area]] to the [[Project]].
{{editor location|buildings}}
| Draw the [[Area]] in the [[3D World]] in the location where the drainages are.
{{howto|title=manually create drainages
| Add an [[aquifer kd (Water Overlay)|AQUIFER_KD]] [[Attribute]] to the [[Area]] with value 1000.
| Add a new underground [[Building]] to the Project.
| Add an [[aquifer height (Water Overlay)|AQUIFER_HEIGHT]] [[Attribute]] to the [[Area]], with the height of the drainages relative to {{datum}} as value.
| 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 location|overlay wizard|your Water Overlay}}
{{howto|title=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 [[Drainage (Water Overlay)|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.
}}
 
{{article end
|notes=
* [[Drainage (Water Overlay)|Drainage]]s function across their entire polygon. In real life, drainages are discrete tubes where water can actually flow freely. In between tubes, water actually still only flows with the speed the underground allows. To model this most accurately, the individual drainage tubes should be represented by individual polygons. However, although some detail may be lost by drawing the drainages as a complete and uninterrupted area, functionally the effect of sped up underground flow is still achieved.
|seealso=
* [[Drainage (Water Overlay)]]
}}
}}
[[Category:How-to's]]

Latest revision as of 15:48, 30 January 2024

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

Editor → Current Situation (Ribbon tab) → Buildings (Ribbon bar)
How to manually create drainages:
  1. Add a new underground Building to the Project.
  2. Set the Building's Function to either "Active Drainage" or "Passive Drainage".
  3. Draw the Building in the 3D Visualization in the location where the drainages are. Ensure the drainages are drawn only under solid land.
  4. 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.
  5. Open the Water Overlay's Water Overlay Wizard, and continue to the step concerning drainages.
  6. 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:
  1. 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.
  2. Ensure all Attributes pertaining to drainages are configured correctly.
  3. Export the data as GeoJSON.
  4. Open the Water Overlay's Water Overlay Wizard, and continue to the step concerning drainages.
  5. Opt to import new data, and import your drainages file.

Notes

  • Drainages function across their entire polygon. In real life, drainages are discrete tubes where water can actually flow freely. In between tubes, water actually still only flows with the speed the underground allows. To model this most accurately, the individual drainage tubes should be represented by individual polygons. However, although some detail may be lost by drawing the drainages as a complete and uninterrupted area, functionally the effect of sped up underground flow is still achieved.

See also

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