For the Project, 4 different salinity classes have been defined. A fourth class, called "0", is neglecting the salinity altogether.
Salinities are both important in the calculation of irrigation demand (higher salinities require larger amounts of leaching) and in the balancing: resources of higher salinities may not be used to fulfill demands for water of lower salinities.
The present definition of salinity classes is defined as follows:
Table Salinity_Class TDS (total dissolved solids) in mg/l
|1||Salinity Class 1||0||1000||Good for Drinking & generally no restriction in irrgtn|
|2||Salinity Class 2||1000||2000||Slight to moderate restriction on irrgtn use|
|3||Salinity Class 3||2000||2800||Severe restriction on irrgtn use, only for special crops|
|4||Salinity Class 4||2800||50000||Usable only after desalination|
|0||no Leaching||0||0||No consideration of salinity|
In the corresponding tables (particularly the STP tables), only the entry of the salinity class field [S_CLASS] is used. If salinity classes are to be redefined, it would be sufficient just to modify the Look-up table.