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-rw-r--r--R/PEC_sw_drift.R43
1 files changed, 32 insertions, 11 deletions
diff --git a/R/PEC_sw_drift.R b/R/PEC_sw_drift.R
index 6fcaecf..2dfd651 100644
--- a/R/PEC_sw_drift.R
+++ b/R/PEC_sw_drift.R
@@ -8,7 +8,9 @@
#' @param applications Number of applications for selection of drift percentile
#' @param drift_percentages Percentage drift values for which to calculate PECsw.
#' 'drift_data' and 'distances' if not NULL.
-#' @param drift_data Source of drift percentage data
+#' @param drift_data Source of drift percentage data. If 'JKI', the [drift_data_JKI]
+#' included in the package is used. If 'RF', the Rautmann formula is used, if
+#' implemented for the crop type and number of applications
#' @param crop Crop name (use German names for JKI data), defaults to "Ackerbau"
#' @param distances The distances in m for which to get PEC values
#' @param water_depth Depth of the water body in cm
@@ -19,15 +21,23 @@
#' @author Johannes Ranke
#' @examples
#' PEC_sw_drift(100)
-PEC_sw_drift <- function(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 = "\u00B5g/L")
+#' # Alternatively, we can use the formula for a single application to "Ackerbau" from the paper
+#' PEC_sw_drift(100, drift_data = "RF")
+#'
+#' # This makes it possible to also use different substances
+#' PEC_sw_drift(100, distances = c(1, 3, 5, 6, 10, 20, 50, 100), drift_data = "RF")
+#'
+#' # Using custom drift percentages is also supported
+#' PEC_sw_drift(100, drift_percentages = c(2.77, 0.95, 0.57, 0.48, 0.29, 0.15, 0.06, 0.03))
+PEC_sw_drift <- function(rate,
+ applications = 1,
+ water_depth = 30,
+ drift_percentages = NULL,
+ drift_data = c("JKI", "RF"),
+ crop = "Ackerbau",
+ distances = c(1, 5, 10, 20),
+ rate_units = "g/ha",
+ PEC_units = "\u00B5g/L")
{
rate_units <- match.arg(rate_units)
PEC_units <- match.arg(PEC_units)
@@ -36,8 +46,19 @@ PEC_sw_drift <- function(rate,
PEC_sw_overspray <- rate * 1e6 / water_volume # in µg/L
dist_index <- as.character(distances)
+ RF <- list(
+ "1" = list("Ackerbau" = function(distance) 2.7705 * distance^-0.9787) # p. 134
+ )
+ if (drift_data == "RF") {
+ if (is.null(RF[[as.character(applications)]])) stop("Rautmann formula not included for ", applications, " applications")
+ if (is.null(RF[[as.character(applications)]][[crop]])) stop("Rautmann formula not included for this case")
+ }
+
if (is.null(drift_percentages)) {
- drift_percentages <- pfm::drift_data_JKI[[applications]][dist_index, crop]
+ drift_percentages <- switch(drift_data,
+ JKI = pfm::drift_data_JKI[[applications]][dist_index, crop],
+ RF = RF[[applications]][[crop]](distances)
+ )
names(drift_percentages) <- paste(dist_index, "m")
} else {
names(drift_percentages) <- paste(drift_percentages, "%")

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