kg N washed away is 1250 kg x 0.1 x 0.15 = ? kg.
That x 1E6 is mg N.
0.165 ft^2/s = 4.7 L/s (by the way that's liter and not litter; it's a volume not a litter of puppies).
concn = mg/4.7 for concn after 1 s but I'm unsure of the time involved. It seems to me that the value is different if you measure the amount of water after 1 s, 2s, 3s, etc.
A farmer supplies 1250.0 kg of a fertilizer that contains 10& nitrogen to his fields each year. Fifteen percent of the fertilizer washes into a river that runs through the farm. If the river flows at an average rate of 0.165 cubic feet per second, what is the additional concentration of nitrogen (expressed in milligrams of nitrogen per litter) in the river water due to the farmer's fertilizer?
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