From 24328f0fabc1982db01132bafb4dc65dd85b13e9 Mon Sep 17 00:00:00 2001 From: Ranke Johannes Date: Fri, 13 Feb 2026 16:13:46 +0100 Subject: Fix UK drainage for very early applications Create a function `drainage_date_UK` that does not only respect the beginning of the drainage period on 1 October, but also the end of the drainage period on 30 April, and use it for determining the degradation time. Applications early in the year before 1 May will now correctly be calculated without degradation time. --- man/PEC_sw_drainage_UK.Rd | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-) (limited to 'man') diff --git a/man/PEC_sw_drainage_UK.Rd b/man/PEC_sw_drainage_UK.Rd index af020c6..b641114 100644 --- a/man/PEC_sw_drainage_UK.Rd +++ b/man/PEC_sw_drainage_UK.Rd @@ -2,6 +2,7 @@ % Please edit documentation in R/PEC_sw_drainage_UK.R \name{PEC_sw_drainage_UK} \alias{PEC_sw_drainage_UK} +\alias{drainage_date_UK} \title{Calculate initial predicted environmental concentrations in surface water due to drainage using the UK method} \usage{ PEC_sw_drainage_UK( @@ -13,6 +14,8 @@ PEC_sw_drainage_UK( model = NULL, model_parms = NULL ) + +drainage_date_UK(application_date) } \arguments{ \item{rate}{Application rate in g/ha or with a compatible unit specified @@ -32,29 +35,35 @@ days or a time unit specified with the units package} "DFOP", "HS", or "IORE", or an mkinmod object} \item{model_parms}{A named numeric vector containing the model parameters} + +\item{application_date}{Application date} } \value{ The predicted concentration in surface water in µg/L } \description{ This implements the method specified in the UK data requirements handbook and was checked against the spreadsheet -published on the CRC website. Degradation before the start of the drainage period is taken into account if +published on the CRC website. Degradation between the end (30 April) and the start (1 October) of +the drainage period is taken into account if \code{latest_application} is specified and the degradation parameters are given either as a \code{soil_DT50} or a \code{model}. } \examples{ PEC_sw_drainage_UK(150, Koc = 100) PEC_sw_drainage_UK(60, interception = 0.5, Koc = 550, latest_application = "01 July", soil_DT50 = 200) +drainage_date_UK("2023-07-10") +drainage_date_UK("2020-12-01") +drainage_date_UK(as.Date("2022-01-15")) } \references{ HSE's Chemicals Regulation Division (CRD) Active substance PECsw calculations (for UK specific authorisation requests) -\url{https://www.hse.gov.uk/pesticides/topics/pesticide-approvals/pesticides-registration/data-requirements-handbook/fate/active-substance-uk.htm} -accessed 2019-09-27 +\url{https://www.hse.gov.uk/pesticides/data-requirements-handbook/fate/pecsw-sed-via-drainflow.htm} +accessed 2026-02-13 -Drainage PECs Version 1.0 (2015) Spreadsheet published at -\url{https://www.hse.gov.uk/pesticides/topics/pesticide-approvals/pesticides-registration/data-requirements-handbook/fate/pec-tools-2015/PEC\%20sw-sed\%20(drainage).xlsx} -accessed 2019-09-27 +PECsw/sed spray drift and tier 1 drainflow calculator Version 2.1.1 (2025) Spreadsheet published at +\url{https://www.hse.gov.uk/pesticides/assets/docs/PEC\%20sw-sed\%20(spraydrift).xlsx)} +accessed 2026-02-13 } \author{ Johannes Ranke -- cgit v1.2.3