Question

Pollutant Loading

#1 An agricultural field was sprayed with 13 kg of an herbicide just prior to a heavy rainstorm that generated an average flow of 0.15 m /s for 25 minutes. All of the runoff from the field enters a basin that was previously empty. Assuming that all of the herbicide is washed from the 7.5 acre field, what is the concentration of herbicide in the basin? [Give the answer in mg/L and use correct significant figures]

Concentration = total load / volume of runoff

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Answer 1