For the graph below, the plume moved 10 meters downgradient every 6 months. The

Question

For the graph below, the plume moved 10 meters downgradient every 6 months. The plume concentration was estimated in mg/l for the solute. What was the original plume concentration when the solute was released at time=0? If you integrate under the curves, the total mass is the same at all four times. What does this indicate about the rate of degradation of the solute? What is the name of this type of solute? What is the advective rate of the groundwater? If the groundwater gradient was halved, what would the advective groundwater velocity be?

Explanation / Answer

The plume moved 10 m downgradient every 6 months.

Original plume concentration = ? at time t=0

As is clear from the graph. the plume concentration is decreasing by 25 mg/l every 6 months.

Therefore going by the graph, the original plume concentration at t=0 would be = 125 mg/l

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