A container of Atrazine (500 g) is dumped into a river 2.3 km upstream of a municipal water intake pipe. The cross-sectional area of the river is 5.7 m2. Assume that the Atrazine is dumped as a point source. If the river flow is 8.25m3/s and the longitudinal dispersion coefficient is 0.1 m2/s, what is the maximum concentration (in ppm) expected at the intake. How spread out (in the direction of flow) is the atrazine at the time the peak concentration occurs at the intake pipe? Assume 2 standard deviations on either side of the peak is a good estimate of spread.

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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A container of Atrazine (500 g) is dumped into a river 2.3 km upstream of a municipal water intake pipe. The cross-sectional area of the river is 5.7 m2. Assume that the Atrazine is dumped as a point source.

If the river flow is 8.25m3/s and the longitudinal dispersion coefficient is 0.1 m2/s, what is the maximum concentration (in ppm) expected at the intake.

How spread out (in the direction of flow) is the atrazine at the time the peak concentration occurs at the intake pipe? Assume 2 standard deviations on either side of the peak is a good estimate of spread. 

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