This is a basic, vectorised form of a simple calculation of a contaminant concentration in surface water based on complete, instantaneous mixing with input via spray drift.
PEC_sw_drift(rate, applications = 1, water_depth = 30, drift_percentages = NULL, drift_data = "JKI", crop = "Ackerbau", distances = c(1, 5, 10, 20), rate_units = "g/ha", PEC_units = "µg/L")
| rate | Application rate in units specified below |
|---|---|
| applications | Number of applications for selection of drift percentile |
| water_depth | Depth of the water body in cm |
| drift_percentages | Percentage drift values for which to calculate PECsw. 'drift_data' and 'distances' if not NULL. |
| drift_data | Source of drift percentage data |
| crop | Crop name (use German names for JKI data), defaults to "Ackerbau" |
| distances | The distances in m for which to get PEC values |
| rate_units | Defaults to g/ha |
| PEC_units | Requested units for the calculated PEC. Only µg/L currently supported |
The predicted concentration in surface water
PEC_sw_drift(100)#> 1 m 5 m 10 m 20 m #> 0.92333333 0.19000000 0.09666667 0.05000000