Ground bottom flow formula (Water Overlay): Difference between revisions
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The seepage is calculated using the following formula: | The seepage is calculated using the following formula: | ||
<math>\Delta s = frac{a}{b}</math> | <math>\Delta s = \frac{a}{b}</math> | ||
: <math>\delta s = frac{(h_{d}(t) - h_{x,y}}{c} \cdot frac{Δt}{24*60*60}</math> | : <math>\delta s = frac{(h_{d}(t) - h_{x,y}}{c} \cdot frac{Δt}{24*60*60}</math> | ||
Revision as of 09:53, 10 July 2020
Underground seepage (from (or to) outside the project area) is calculated per cell.
The seepage is calculated using the following formula:
- Failed to parse (syntax error): {\displaystyle \delta s = frac{(h_{d}(t) - h_{x,y}}{c} \cdot frac{Δt}{24*60*60}}
The external seepage head is variable over time by the introduction of hv,t
- hd(t) = hc + hv,t(t)
Finally, calculate the actual amount of water infiltrating.
- Δw = Δs/ ws
Where:
- Δs = The underground seepage which takes place, in meters.
- Δt = Computational timestep in seconds.
- hd = ground water level (or head) of the external zone causing the seepage, in meters
- hv> = additional variation in head of hd over time
- c = resistance of the separating layer.
- ws = soil water storage fraction
- Hunsat = The height of the unsaturated zone.
- S = Ratio of water to height in the unsaturated zone.
- Cinf = The height in the unsaturated zone which can be subject to infiltration to the saturated zone.
- Wunset = The amount of water in the unsaturated zone. The height of the water column if the equivalent amount of water was placed on the surface.
- WLunderground = The groundwater level, relative to datum.
- Hsurface = The terrain height in the cell, relative to datum.
- Iund = The GROUND_INFILTRATION_MD of the underground terrain type.
Related
The following topics are related to this formula.