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+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/PEC_sw_exposit_runoff.R
+\name{PEC_sw_exposit_drainage}
+\alias{PEC_sw_exposit_drainage}
+\title{Calculate PEC surface water due to drainage as in Exposit 3}
+\source{
+Excel 3.02 spreadsheet available from
+  \url{https://www.bvl.bund.de/DE/04_Pflanzenschutzmittel/03_Antragsteller/04_Zulassungsverfahren/07_Naturhaushalt/psm_naturhaush_node.html#doc1400590bodyText3}
+}
+\usage{
+PEC_sw_exposit_drainage(rate, interception = 0, Koc = NA,
+  mobility = c(NA, "low", "high"), DT50 = Inf, t_drainage = 3,
+  V_ditch = 30, V_drainage = c(spring = 10, autumn = 100),
+  dilution = 2)
+}
+\arguments{
+\item{rate}{The application rate in g/ha}
+
+\item{interception}{The fraction intercepted by the crop}
+
+\item{Koc}{The sorption coefficient to soil organic carbon used to determine the mobility. A trigger
+value of 550 L/kg is used in order to decide if Koc >> 500.}
+
+\item{mobility}{Overrides what is determined from the Koc.}
+
+\item{DT50}{The soil half-life in days}
+
+\item{t_drainage}{The time between application and the drainage event, where degradation occurs, in days}
+
+\item{V_ditch}{The volume of the ditch is assumed to be 1 m * 100 m * 30 cm = 30 m3}
+
+\item{V_drainage}{The drainage volume, equivalent to 1 mm precipitation on 1 ha for spring/summer or 10 mm for
+autumn/winter/early spring.}
+
+\item{dilution}{The dilution factor}
+}
+\value{
+A list containing the following components
+  \describe{
+    \item{perc_runoff}{The runoff percentages for dissolved and bound substance}
+    \item{runoff}{A matrix containing dissolved and bound input for the different distances}
+    \item{PEC_sw_runoff}{A matrix containing PEC values for dissolved and bound substance
+      for the different distances. If the rate was given in g/ha, the PECsw are in microg/L.}
+  }
+}
+\description{
+This is a reimplementation of the calculation described in the Exposit 3.02 spreadsheet file,
+in the worksheet "Konzept Drainage". Although there are four groups of
+compounds ("Gefährdungsgruppen"), only one distinction is made in the
+calculations, between compounds with low mobility (group 1) and compounds
+with modest to high mobility (groups 2, 3 and 4). In this implementation,
+the group is derived only from the Koc, if not given explicitly. For
+details, see the discussion of the function arguments below.
+}
+\examples{
+  PEC_sw_exposit_drainage(500, Koc = 150)
+}
+\seealso{
+\code{\link{perc_runoff_exposit}} for runoff loss percentages and \code{\link{perc_runoff_reduction_exposit}} for runoff reduction percentages used
+}