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Table 3 Results from lowering the standard values of the runoff curve number (CN; intermediate antecedent moisture conditions, AMC II) by 10%: maximum predicted environmental concentrations for surface water (PECsw,max) (µg/l), calculated using FOCUS PRZM and TOXSWA and the standard scenarios for potatoes; The recalculated PECsw,max are based on runoff mass fluxes from FOCUS PRZM, considering a dilution from the upper catchment in the stream scenarios

From: Consideration of risk management practices in regulatory risk assessments: evaluation of field trials with micro-dams to reduce pesticide transport via surface runoff and soil erosion

 Aclonifen (immobile)
(1200 g ha−1) [10]
Fluazinam (mod. mobile)
(750 g ha−1) [11]
Metribuzin [9] (highly mobile)
(350 g ha−1)
Regular CNCN − 10%PECsw,max red. (%)Regular CNCN − 10%PECsw,max red. (%)Regular CNCN − 10%PECsw,max red. (%)
R1 streama1.430.35760.850.20760.616.7E−0399
R2 streamb0.500.20600.210.08601.210.4266
R3 streamc1.830.50731.320.337521.10.2299
  1. The substances under investigation are aclonifen, fluazinam and metribuzin, applied once ± 14 days relative to emergence
  2. aACL and FLZ: event causing PECsw,max occurs on May 20th and on May 30th 1984 without and with the application of micro-dams, respectively; MTB: on May 7th and on May 20th 1984, respectively
  3. bAll three substances: both with and without the application of micro-dams, PECsw,max causing event occurs on March 11th 1977
  4. cAll three substances: event causing PECsw,max occurs on April 2nd and on April 20th 1980 without and with the application of micro-dams