Ground bottom flow formula (Water Overlay): Difference between revisions

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* <math>c</math> = resistance of the separating layer in days
* <math>c</math> = resistance of the separating layer in days
* <math>ws</math> = water storage fraction of the soil
* <math>ws</math> = water storage fraction of the soil
==Related==
The following topics are related to this formula.
; Formulas
: [[Groundwater level formula (Water Overlay)|Groundwater level formula]]
: [[Surface infiltration formula (Water Overlay)|Surface infiltration formula]]
; Models
: [[Underground model (Water Overlay)|Underground model]]
: [[Infiltration model (Water Overlay)|Infiltration model]]


==See also==
==See also==
* The formula is based on the formula of Pankow for [http://grondwaterformules.nl/index.php/formules/ontwatering/kwel-berekenen-pankow  estimating seepage]
* The formula is based on the formula of Pankow for [http://grondwaterformules.nl/index.php/formules/ontwatering/kwel-berekenen-pankow  estimating seepage]
* [[Seepage result type (Water Overlay)|Seepage result type]]


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Revision as of 15:18, 10 July 2020

Underground seepage (from (or to) outside the project area) is calculated per cell.

The seepage is calculated using the following formula:

The external seepage head is variable over time by the introduction of hv,t

Finally, calculate the actual amount of water seeping into (or out of) the ground from the bottom.

Where:

  • = The underground seepage which takes place, in meters.
  • = Computational timestep in seconds.
  • = Ground water head in the grid cell.
  • = ground water level (or head) of the external zone causing the seepage at time t, in meters
  • = constant ground water level (or head) of the external zone causing the seepage, in meters
  • = additional variation of seepage head over time
  • = resistance of the separating layer in days
  • = water storage fraction of the soil

See also

Template:WaterOverlay nav