The great lake of Janitzio serves as a deposit for the sewage waste of the towns...
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The great lake of Janitzio serves as a deposit for the sewage waste of the towns that surround the lake These have been pouring into it for over 70 years. This contamination has been growing as shown in the figure, in tons/year, until year 50. And later it is lowered to 50 tons/year until the year 70, in which the sewage treatment plants will start operating, causing the pollution of the lake to decrease to a level of 0 tons in the year 70. The annual pollution rate is shown below. Pollution tons/year 100 70 50 30 0 20 40 50 70 yeats On the other hand, the lake naturally has mechanisms that absorb or degrade these pollutants, lessening the pollution accumulated in it, in an average time of 20 years. a) Find the dynamic hypothesis. b) Find the dynamic model. c) Find the mathematical model for each time interval. d) Find the pollution behavior of the lake, e) What would be its maximum pollution peak in the lake, and in what year does it occur. f) If in the year 70 when the water treatment plant opened, altogether ignoring the waste. How long do you estimate it will take to decontaminate the lake? The great lake of Janitzio serves as a deposit for the sewage waste of the towns that surround the lake These have been pouring into it for over 70 years. This contamination has been growing as shown in the figure, in tons/year, until year 50. And later it is lowered to 50 tons/year until the year 70, in which the sewage treatment plants will start operating, causing the pollution of the lake to decrease to a level of 0 tons in the year 70. The annual pollution rate is shown below. Pollution tons/year 100 70 50 30 0 20 40 50 70 yeats On the other hand, the lake naturally has mechanisms that absorb or degrade these pollutants, lessening the pollution accumulated in it, in an average time of 20 years. a) Find the dynamic hypothesis. b) Find the dynamic model. c) Find the mathematical model for each time interval. d) Find the pollution behavior of the lake, e) What would be its maximum pollution peak in the lake, and in what year does it occur. f) If in the year 70 when the water treatment plant opened, altogether ignoring the waste. How long do you estimate it will take to decontaminate the lake?
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Cost Benefit Analysis Concepts and Practice
ISBN: 978-0137002696
4th edition
Authors: Anthony Boardman, David Greenberg, Aidan Vining, David Weimer
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