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+# Regression parameters for the Rautmann drift data
+
+The parameters were extracted from Appendix B to the FOCUS surface water
+guidance using the R code given in the file
+`data_generation/drift_parameters_focus.R` installed with this package.
+The appendix itself is not included in the package, as its licence is
+not clear.
+
+## Usage
+
+``` r
+drift_parameters_focus
+```
+
+## Format
+
+A [tibble::tibble](https://tibble.tidyverse.org/reference/tibble.html).
+
+## Details
+
+For the hinge distance, `Inf` was substituted for the cases where no
+hinge distance is given in the data, in this way parameters C and D are
+never used for any distance if A and B are used for the case that the
+distance is smaller than the hinge distance.
+
+## References
+
+FOCUS (2014) Generic guidance for Surface Water Scenarios (version 1.4).
+FOrum for the Co-ordination of pesticde fate models and their USe.
+<http://esdac.jrc.ec.europa.eu/public_path/projects_data/focus/sw/docs/Generic%20FOCUS_SWS_vc1.4.pdf>
+
+FOCUS (2001) FOCUS Surface Water Scenarios in the EU Evaluation Process
+under 91/414/EEC. Report of the FOCUS Working Group on Surface Water
+Scenarios, EC Document Reference SANCO/4802/2001-rev.2. 245, Appendix B.
+<https://esdac.jrc.ec.europa.eu/public_path/projects_data/focus/sw/docs/FOCUS_SWS_APPENDIX_B.doc>
+
+Rautmann, D., Streloke, M and Winkler, R (2001) New basic drift values
+in the authorization procedure for plant protection products Mitt. Biol.
+Bundesanst. Land- Forstwirtsch. 383, 133-141
+
+## See also
+
+[drift_percentages_rautmann](https://pkgdown.jrwb.de/pfm/reference/drift_percentages_rautmann.md),
+[PEC_sw_drift](https://pkgdown.jrwb.de/pfm/reference/PEC_sw_drift.md)
+
+## Examples
+
+``` r
+drift_parameters_focus
+#> # A tibble: 49 × 8
+#>    crop_group n_apps percentile     A      B     C     D hinge
+#>    <chr>       <int>      <int> <dbl>  <dbl> <dbl> <dbl> <dbl>
+#>  1 arable          1         90  2.76 -0.978   NA  NA    Inf  
+#>  2 arable          2         82  2.44 -1.01    NA  NA    Inf  
+#>  3 arable          3         77  2.02 -0.996   NA  NA    Inf  
+#>  4 arable          4         74  1.86 -0.986   NA  NA    Inf  
+#>  5 arable          5         72  1.79 -0.994   NA  NA    Inf  
+#>  6 arable          6         70  1.63 -0.986   NA  NA    Inf  
+#>  7 arable          7         69  1.58 -0.981   NA  NA    Inf  
+#>  8 arable          8         67  1.51 -0.983   NA  NA    Inf  
+#>  9 hops            1         90 58.2  -1.00  8655. -2.84  15.3
+#> 10 hops            2         82 66.2  -1.20  5555. -2.82  15.3
+#> # ℹ 39 more rows
+unique(drift_parameters_focus$crop_group)
+#> [1] "arable"       "hops"         "vines, late"  "vines, early" "fruit, late" 
+#> [6] "fruit, early" "aerial"      
+```