Pollutants evaporation from water basins

These last expressions represent the response of pollutant concentrahon in the water basin to a jump increase in the inflow from C = 0 to C = C. Here, again, there is an initial rapid increase in pollutant levels, which diminishes with time and ultimately approaches the asymptotic steady-state value of C = Cf. This is shown in Figure 2.3b. The difference in the two responses lies principally in the time of approach to steady state. This can be shown by computing the time required to attain 95% of the respective steady-state values. For Figure 2.3a with evaporative loss we obtain by division of Equation 2.3f and Equation 2.3g... 

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