| RecYear | | Physical quantity | Year of record |
| RecMonth | | Physical quantity | month of record |
| RecDay | | Physical quantity | day of record |
| Watershed | | Nominal | Watershed of treatment |
| Type | | Nominal | type in which data were collected (B) |
| Amount | | Physical quantity | Rainfall amount |
| NO3 | | Physical quantity | NO3 concentration |
| limitNO3 | | Physical quantity | limit ofdetection symbol for NO3 |
| NH4 | | Physical quantity | Ammonium concentration |
| LimitNH4 | | Physical quantity | Limit of detection for Ammonium concentration |
| TPN | | Physical quantity | Total persulfate N |
| LimitTPN | | Physical quantity | Limit of Total persulfate N |
| SRP | | Physical quantity | Soluble reactive phosphate |
| LimitSRP | | Physical quantity | Limit of Soluble reactive phosphate |
| TPP | | Physical quantity | Total P concentration (ug/l) |
| LimitTPP | | Physical quantity | Limit of Total P concentration (ug/l) |