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Sediments in a small stream are known to be contaminated from previous discharges from an old...

Sediments in a small stream are known to be contaminated from previous discharges from an old manufacturing plant. From field studies, the release of contaminant from the sediments is occurring at a rate of 1 g/m2-day. If the average flow, the average depth and the average width of the stream are given as 6 m3/s, 0.5 m and 12 m, respectively, determine the concentration of the contaminant at a location 20 km downstream of the discharge.For your calculations, assume that the contaminant is removed from the water column by a first-order reaction with a rate coefficient of 0.2/day.

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