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")

Arguments

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

Value

The predicted concentration in surface water

Examples

PEC_sw_drift(100)
#> 1 m 5 m 10 m 20 m #> 0.92333333 0.19000000 0.09666667 0.05000000