Role and Place in FOCUS scenarios calculation The calculator determines the mean drift loading over the width of the receiving water body and the drift loading is reported with units of mg/m2 of water body surface area.Ī detailed description of the equations used in the drift calculations is provided in the FOCUS Surface Water Scenarios Final Report in section 5.2. Each drift regression curve is a function of the crop type as well as the number of applications.
The Drift Calculator uses a series of drift regressions based on BBA, 2000 drift data. The user enters the crop type, the application rate and the number of applications per season in SWASH and the SWASH shell automatically runs the drift calculator and generates a report for each TOXSWA run in the file "projectname_report.txt" located in the SWASH PROJECTS directory under the selected project name. The drift calculator requires five input values in order to determine the correct drift loading:įor Step 3 FOCUS calculations, the types of water bodies associated with each scenario and default distances between crop and water have been set by the FOCUS SW group.
#WATER DRIFT FOCUS GIF SOFTWARE#
The equations in the drift calculator were developed by Denis Yon (Dow Agrosciences, UK) and Mark Russell (DuPont Crop Protection, USA) and the model was programmed by Alterra, in close co-operation with WISL, the Wageningen Software Labs, both located in Wageningen, the Netherlands. The FOCUS drift calculator is embedded in the SWASH shell and is run automatically run in the background to provide drift values for use in TOXSWA simulations of aquatic fate.
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