Fungicide Runoff & Stream Ecotoxicity Simulator

A treated field, a rain event, a vegetative buffer strip and a receiving stream — this simulator solves the advection-dispersion-reaction equation that governs how fungicide washed off a field actually behaves once it reaches surface water. Pick a fungicide class, an application rate and a rainfall intensity, then watch the plume travel down the channel while a live hazard quotient at the downstream monitoring station tells you whether the exposure crosses an acute-toxicity threshold for aquatic algae. Widening the buffer strip shows, quantitatively, how much of that risk a few extra metres of grass actually removes.