PEC_sw_drift: Rautmann formula (1 app, Ackerbau)

This makes it possible to calculate drift PECsw for other distances than
present in the JKI data or the Rautmann paper.

1 files changed, 19 insertions, 4 deletions

diff --git a/tests/testthat/test_PEC_sw_drift.R b/tests/testthat/test_PEC_sw_drift.R
index d09d578..667b402 100644
--- a/tests/testthat/test_PEC_sw_drift.R
+++ b/tests/testthat/test_PEC_sw_drift.R
@@ -3,13 +3,28 @@ context("Simple PEC surface water calculations with drift entry")
 
 test_that("PEC_sw_drift gives the same results as the CRD PEC calculator", {
   # One application of 30 g/ha to field crops calculated with UK PEC calculator published by CRD
-  expect_equal(round(PEC_sw_drift(30), 3), 
+  expect_equal(round(PEC_sw_drift(30), 3),
                c('1 m' = 0.277, '5 m' = 0.057, '10 m' = 0.029, '20 m' = 0.015))
 
   # 7 applications of 30 g/ha to field crops calculated with UK PEC calculator, initial PEC
-  expect_equal(round(PEC_sw_drift(30, 7), 3), 
+  expect_equal(round(PEC_sw_drift(30, 7), 3),
                c('1 m' = 0.161, '5 m' = 0.033, '10 m' = 0.017, '20 m' = 0.008))
 
-  # 4 applications of 30 g/ha to late fruit crops calculated with UK PEC calculator published by CRD (uses different drift values from SANCO aquatic guidance)
-  #expect_equal(round(PEC_sw_drift(30, 4, crop = "Obstbau spät", distances = c(3, 20, 50)), 3), c('3 m' = 1.101, '20 m' = 0.080, '50 m' = 0.013))
+  # 4 applications of 30 g/ha to late fruit crops calculated with UK PEC
+  # calculator published by CRD. CRD uses different drift values from SANCO aquatic
+  # guidance), except for 50 m
+  pfm_30_4_obst_spaet <- round(PEC_sw_drift(30, 4, crop = "Obstbau spaet",
+      distances = c(3, 20, 50)), 3)
+  crd_30_4_obst_spaet <- c('3 m' = 1.101, '20 m' = 0.080, '50 m' = 0.013)
+  expect_equal(pfm_30_4_obst_spaet[3], crd_30_4_obst_spaet[3])
+})
+
+test_that("The Rautmann formula is correctly implemented", {
+  pfm_jki <- PEC_sw_drift(100)
+  pfm_rf <- PEC_sw_drift(100, drift_data = "RF")
+  expect_equal(pfm_jki, pfm_rf, tolerance = 0.01)
+
+  expect_error(PEC_sw_drift(100, drift_data = "RF", applications = 2), "Rautmann formula not included")
+  expect_error(PEC_sw_drift(100, drift_data = "RF", applications = 1, crop = "Obstbau spaet"),
+    "Rautmann formula not included")
 })