Season formula (Water Overlay)
The season fraction and index are variables used for calculating the transpiration factor in the Ground evaporation formula. It used the configured start date of a Water Overlay and selected months and day of months to determine plants growth seasons.
Evaporation month indices:
| Index | Month | Day of Month | Transpiration value |
|---|---|---|---|
| 2 | March | 15 | 1st |
| 3 | April | 15 | 2nd |
| 6 | July | 15 | 3rth |
| 8 | September | 15 | 4th |
| 9 | October | 1 | 1st |
Evaporation factor graphs
The evaporation graphs showing the evaporation factor as a percentage per day. 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.
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.