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diff --git a/pkg/R/PEC_sw_drainage_UK.R b/pkg/R/PEC_sw_drainage_UK.R
deleted file mode 100644
index e53f179..0000000
--- a/pkg/R/PEC_sw_drainage_UK.R
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@@ -1,66 +0,0 @@
-# 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 drainage using the UK method
-#'
-#' This implements the method specified in the UK data requirements handbook and was checked against the spreadsheet
-#' published on the CRC website
-#'
-#' @param rate Application rate in g/ha
-#' @param interception The fraction of the application rate that does not reach the soil
-#' @param Koc The sorption coefficient normalised to organic carbon in L/kg
-#' @param latest_application Latest application date, formatted as e.g. "01 July"
-#' @param soil_DT50 Soil degradation half-life, if SFO kinetics are to be used
-#' @param model The soil degradation model to be used. Either one of "FOMC",
-#'   "DFOP", "HS", or "IORE", or an mkinmod object
-#' @param model_parms A named numeric vector containing the model parameters
-#' @return The predicted concentration in surface water in µg/L
-#' @export
-#' @author Johannes Ranke
-#' @examples
-#' PEC_sw_drainage_UK(150, Koc = 100)
-PEC_sw_drainage_UK <- function(rate, interception = 0, Koc,
-                                   latest_application = NULL, soil_DT50 = NULL,
-                                   model = NULL, model_parms = NULL)
-{
-  percentage_lost <- SSLRC_mobility_classification(Koc)[[2]]
-  amount_available <- rate * (1 - interception) # g/ha
-
-  if (!missing(latest_application)) {
-    lct <- Sys.getlocale("LC_TIME")
-    tmp <- Sys.setlocale("LC_TIME", "C")
-    latest <- as.Date(paste(latest_application, "1999"), "%d %b %Y")
-    tmp <- Sys.setlocale("LC_TIME", lct)
-    degradation_time <- as.numeric(difftime(as.Date("1999-10-01"), units = "days", latest))
-    if (!missing(soil_DT50)) {
-      k = log(2)/soil_DT50
-      as.Date(paste(latest_application, "1999"), "%d %B %Y")
-
-      amount_available <- amount_available * exp(-k * degradation_time)
-      if (!missing(model)) stop("You already supplied a soil_DT50 value, implying SFO kinetics")
-    }
-    if (!missing(model)) {
-      fraction_left <- pfm_degradation(model, parms = model_parms, 
-                                       times = degradation_time)[1, "parent"]
-      amount_available <- fraction_left * amount_available
-    }
-  } 
-
-  volume = 130000 # L/ha
-  PEC = 1e6 * (percentage_lost/100) * amount_available / volume
-  return(PEC)
-}