(Lake Erie) Lake Erie has a water volume of about 450 km3
Chapter 1, Problem 1.5(choose chapter or problem)
(Lake Erie) Lake Erie has a water volume of about 450 km3 and a flow rate (in and out) of about 175 km3 per year. If at some instant the lake has pollution c~nc~ntration p = 0.04%, how long, approximately. wIll It take to decrease it to pl2. assuming that the inflow is much cleaner, say, it has pollution concentration p/4. and the mixture is unifonn (anassumption that is only very imperfectly true)? First,guess.
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