From 72c56f4246966c1bea627f601cf3cc457734f023 Mon Sep 17 00:00:00 2001 From: Johannes Ranke Date: Tue, 19 Feb 2019 12:27:00 +0100 Subject: Add German drainage calculations using Exposit 3.02 --- docs/reference/PEC_sw_exposit_drainage.html | 239 ++++++++++++++++++++++++++++ 1 file changed, 239 insertions(+) create mode 100644 docs/reference/PEC_sw_exposit_drainage.html (limited to 'docs/reference/PEC_sw_exposit_drainage.html') diff --git a/docs/reference/PEC_sw_exposit_drainage.html b/docs/reference/PEC_sw_exposit_drainage.html new file mode 100644 index 0000000..62d83fa --- /dev/null +++ b/docs/reference/PEC_sw_exposit_drainage.html @@ -0,0 +1,239 @@ + + + + + + + + +Calculate PEC surface water due to drainage as in Exposit 3 — PEC_sw_exposit_drainage • pfm + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
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Calculate PEC surface water due to drainage as in Exposit 3

+ Source: R/PEC_sw_exposit_runoff.R + +
+ +
+ +

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.

+ +
+ + 
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

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
rate

The application rate in g/ha

interception

The fraction intercepted by the crop

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.

mobility

Overrides what is determined from the Koc.

DT50

The soil half-life in days

t_drainage

The time between application and the drainage event, where degradation occurs, in days

V_ditch

The volume of the ditch is assumed to be 1 m * 100 m * 30 cm = 30 m3

V_drainage

The drainage volume, equivalent to 1 mm precipitation on 1 ha for spring/summer or 10 mm for +autumn/winter/early spring.

dilution

The dilution factor

+ +

Source

+ +

Excel 3.02 spreadsheet available from + https://www.bvl.bund.de/DE/04_Pflanzenschutzmittel/03_Antragsteller/04_Zulassungsverfahren/07_Naturhaushalt/psm_naturhaush_node.html#doc1400590bodyText3

+ +

Value

+ +

A list containing the following components

+
perc_runoff

The runoff percentages for dissolved and bound substance

+
runoff

A matrix containing dissolved and bound input for the different distances

+
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.

+
+ + +

See also

+ +

perc_runoff_exposit for runoff loss percentages and perc_runoff_reduction_exposit for runoff reduction percentages used

+ + +

Examples

+ 
  PEC_sw_exposit_drainage(500, Koc = 150)
#> $perc_drainage_total
+#> spring autumn 
+#>    0.2    1.0 
+#> 
+#> $perc_peak
+#> spring autumn 
+#>   12.5   25.0 
+#> 
+#> $PEC_sw_drainage
+#>   spring   autumn 
+#> 1.562500 4.807692 
+#>
+
+ +
+ + +
+ + + + + + -- cgit v1.2.1