Drainage (Subsidence Overlay): Difference between revisions

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===Drainage behavior===
===Drainage behavior===
* In case the value is positive and non-zero, this value represents the distance between the Surface and the Groundwater Level. In that case, the Water Level will always remain the same.
* A drainage is active when the Drainage value is larger than 0. In this case, the drainage always sets the ground water level to the same relative depth. The drainage value indicates the relative depth of the ground water.
* In case the value is negative and non-zero, either the configured passive Hi or Low Drainage value for the Subsidence Overlay will be used to determine the distance between the Surface and the Groundwater Level. Also note that the actual negative value itself is not used.
* A drainage is passive when the Drainage value is smaller than 0. In this case, depending on which ground water level is used (high or low), the water level is additionally adjusted with the [[Hi passive drainage (Subsidence Overlay)|high]] or [[Low passive drainage (Subsidence Overlay)|low passive drainage]] value configured for the [[Subsidence Overlay]]. In this case, the actual negative value of the drainage does not matter.
* In case the value is zero, the Drainage has no influence on the Groundwater Level. In this case the general method to calculate the distance between the Surface and the Groundwater Level is used.
* In case the drainage value is zero, the [[Drainage feature (Subsidence Overlay)|Drainage]] has no influence on the groundwater level. In this case the [[Ground_water_depth_formula_(Subsidence_Overlay)|general method]] to calculate the distance between the Surface and the Groundwater Level is used.


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Revision as of 10:51, 10 February 2021

Drainage behavior

  • A drainage is active when the Drainage value is larger than 0. In this case, the drainage always sets the ground water level to the same relative depth. The drainage value indicates the relative depth of the ground water.
  • A drainage is passive when the Drainage value is smaller than 0. In this case, depending on which ground water level is used (high or low), the water level is additionally adjusted with the high or low passive drainage value configured for the Subsidence Overlay. In this case, the actual negative value of the drainage does not matter.
  • In case the drainage value is zero, the Drainage has no influence on the groundwater level. In this case the general method to calculate the distance between the Surface and the Groundwater Level is used.