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diff --git a/pkg/R/PEC_sw_drift_ini.R b/pkg/R/PEC_sw_drift_ini.R
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--- a/pkg/R/PEC_sw_drift_ini.R
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-# Copyright (C) 2015  Johannes Ranke
-# Contact: jranke@uni-bremen.de
-# This file is part of the R package pfm
-
-# This program is free software: you can redistribute it and/or modify it under
-# the terms of the GNU General Public License as published by the Free Software
-# Foundation, either version 3 of the License, or (at your option) any later
-# version.
-
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
-# details.
-
-# You should have received a copy of the GNU General Public License along with
-# this program. If not, see <http://www.gnu.org/licenses/>
-
-#' Calculate initial predicted environmental concentrations in surface water due to drift
-#'
-#' 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.
-#'
-#' @param rate Application rate in units specified below
-#' @param applications Number of applications for selection of drift percentile
-#' @param drift_data Source of drift percentage data
-#' @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
-#' @param rate_units Defaults to g/ha
-#' @param PEC_units Requested units for the calculated PEC. Only µg/L currently supported
-#' @return The predicted concentration in surface water
-#' @export
-#' @author Johannes Ranke
-#' @examples
-#' PEC_sw_drift_ini(100)
-PEC_sw_drift_ini <- function(rate, 
-                         applications = 1,
-                         water_depth = 30, 
-                         drift_data = "JKI",
-                         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)
-  drift_data <- match.arg(drift_data)
-  water_volume <- 100 * 100 * (water_depth/100) * 1000   # in L (for 1 ha)
-  PEC_sw_overspray <- rate * 1e6 / water_volume          # in µg/L
-  dist_index <- as.character(distances)
-  PEC_sw_drift <- PEC_sw_overspray * pfm::drift_data_JKI[[applications]][dist_index, crop] / 100
-  names(PEC_sw_drift) <- paste(dist_index, "m")
-  return(PEC_sw_drift)
-}