Global soil parameters are defined in the file "bopa.txt". The file must be provided in the directory of the model file. If such a file exists, the default parameters are replaced by this. If there exists no file "bopa.txt", the following default values are used.

 

Structure of the soil parameter file "bopa.txt" with default values:

 

Column	Meaning	Standardwerte
1	Medium field capacity in [%]: 1st value: sand soils, 2nd value: clay soils	10., 15.
2	Effective root depth in [dm]: 1st value: farm/grass land, build up areas, 2nd value: forest	3., 6.
3	Permanent wilting point in[%]: 1st value: sand soils, 2nd value: clay soils	3., 4.
4	Correction factor of possible over-saturated field capacity	1., 1.

 

Example of a soil parameter file "bopa.txt":

 

 

 

The correction factor takes an over-saturation of the soil by the field capacity into account, which is reduced in heavy soils after 1 or 2 days. In sand, the correction factor is 1, in heavy soils it is up to 1.2 (from: DVWK 238/1996).

The rate of capillary rise is not considered.

 

Input dialog in SPRING