Predicting the impact of accidental pollution is more difficult than that of continuous pollution, and describing the variability of the phenomena involved is not an easy task. The authors describe a simulation method using a sophisticated mathematical model which, when applied to an accidental spillage of toxic material, accurately determines its impact on water intakes downstream from the spill. The model is based on dispersal equations and makes allowances for the phenomenon of biological decay and the velocity gradient of the water in the river. It is used during simulations conducted by injecting a dye into the river.

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