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.

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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

• Ground evaporation formula (Water Overlay)

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