Difference between revisions of "Groundwater Modelling Advice Draft"
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= Common Questions Answered (FAQ) = | = Common Questions Answered (FAQ) = | ||
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| + | == Can TUFLOW trap groundwater beneath impervious areas to prevent unrealistic exfiltration? == | ||
| + | Currently, TUFLOW does not directly simulate pressurised groundwater flow beneath impervious surfaces. The existing groundwater model calculates exfiltration based on mass balance, meaning that groundwater can still migrate upward even in areas where the surface is defined as impervious. | ||
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| + | However, we recognise that this could be an important feature for improving groundwater representation in urban modelling. We are considering incorporating a method to account for trapped groundwater as part of the 2026 development cycle. | ||
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| + | In the meantime, users may mitigate this issue by: | ||
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| + | * Removing impervious locations from the soil layer entirely. | ||
| + | |||
| + | * Setting horizontal hydraulic conductivity to zero for soil polygons beneath impervious areas. | ||
| + | |||
| + | * Adjusting the soil thickness and properties to reduce unrealistic seepage effects. | ||
| + | |||
| + | If this issue is recurring or if you have specific use cases where this feature would be beneficial, we encourage you to share your feedback via support@tuflow.com. | ||
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== What is the recommended method for representing a railway ballast area in TUFLOW? == | == What is the recommended method for representing a railway ballast area in TUFLOW? == | ||
A railway ballast area in TUFLOW can be represented as a soil layer (specific soil ID) with high infiltration, suitable porosity, and high hydraulic conductivity in both horizontal and vertical directions. | A railway ballast area in TUFLOW can be represented as a soil layer (specific soil ID) with high infiltration, suitable porosity, and high hydraulic conductivity in both horizontal and vertical directions. | ||
A global soil thickness value can define the depth of this layer relative to the surface elevation. Similarly, a global soil base elevation value beneath the railway ballast area can set the absolute elevation of its bottom. Both parameters can also be varied spatially with GIS and/or grid layers. | A global soil thickness value can define the depth of this layer relative to the surface elevation. Similarly, a global soil base elevation value beneath the railway ballast area can set the absolute elevation of its bottom. Both parameters can also be varied spatially with GIS and/or grid layers. | ||
Revision as of 12:09, 24 February 2025
Page Under Construction
Common Questions Answered (FAQ)
Can TUFLOW trap groundwater beneath impervious areas to prevent unrealistic exfiltration?
Currently, TUFLOW does not directly simulate pressurised groundwater flow beneath impervious surfaces. The existing groundwater model calculates exfiltration based on mass balance, meaning that groundwater can still migrate upward even in areas where the surface is defined as impervious.
However, we recognise that this could be an important feature for improving groundwater representation in urban modelling. We are considering incorporating a method to account for trapped groundwater as part of the 2026 development cycle.
In the meantime, users may mitigate this issue by:
- Removing impervious locations from the soil layer entirely.
- Setting horizontal hydraulic conductivity to zero for soil polygons beneath impervious areas.
- Adjusting the soil thickness and properties to reduce unrealistic seepage effects.
If this issue is recurring or if you have specific use cases where this feature would be beneficial, we encourage you to share your feedback via support@tuflow.com.
What is the recommended method for representing a railway ballast area in TUFLOW?
A railway ballast area in TUFLOW can be represented as a soil layer (specific soil ID) with high infiltration, suitable porosity, and high hydraulic conductivity in both horizontal and vertical directions.
A global soil thickness value can define the depth of this layer relative to the surface elevation. Similarly, a global soil base elevation value beneath the railway ballast area can set the absolute elevation of its bottom. Both parameters can also be varied spatially with GIS and/or grid layers.