Season formula (Water Overlay)
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The season fraction and index are variables used for calculating the transpiration factor in the Ground evaporation formula. It uses the configured start date of a Water Overlay and selected months and day of months to determine one of the four configured (seasonal) evaporation factors.
Evaporation month, day of month and corresponding evaporation factor array value:
| Month | Day of Month | Transpiration value |
|---|---|---|
| March | 15 | 1st |
| April | 15 | 2nd |
| July | 15 | 3rth |
| September | 15 | 4th |
| October | 1 | 1st |
Evaporation factor graphs
The evaporation graphs showing the evaporation factor as a percentage per day. These are based on Table 2.10 Cropfactors[1] of the Gwz2016 book. The approximated graphs use five control points (see the season table above) per type, such that it can be reduced to four values per year.
Evaporation factors in the function table in the editor
Notes
- The growth season dates are determined based on western european growth and transpiration graphs of the following crops and plants: grass, corn, potato, beet, grain, orchard and heather.
See also
References
- ↑ Table 2.10 Gewasfactoren, % van referentiegewasverdamping van Makkink, Bram Bot (2016) ∙ Grondwaterzakboekje, Gwz2016 ∙ Impressed druk en print
- Models
- Surface • Ground • Rain • Evaporation • Infiltration • Elevation • Breach • Sewer • Storage • Tracer flow • Border • Order
- Model formulas
- Timestep • Season • Surface water level • Groundwater level
- Flow formulas
- Surface flow • Surface infiltration • Ground flow • Ground infiltration • Surface evaporation • Ground evaporation • Ground bottom flow
- Hydraulic structure formulas
- Culvert • Weir • Breach growth • Breach flow • Pump • Sewer Overflow • Inlet • Drainage
- Related