Where does all the water go? According to the Environmental Protection Agency (E

Question

Where does all the water go? According to the Environmental Protection Agency (EPA), in a typical wetland environment, 37% of the water is outflow; 49% is seepage; 7% evaporates; and 7% remains as water volume in the ecosystem (Reference: United States Environmental Protection Agency Case Studies Report 832-R-93-005). Chloride compounds as residuals from residential areas are a problem for wetlands. Suppose that in a particular wetland environment the following concentrations (mg/l) of chloride compounds were found: outflow, 68.9; seepage, 73.3; remaining due to evaporation, 33.2; in the water volume, 46.8.

(a) Compute the weighted average of chlorine compound concentration (mg/l) for this ecological system. (Round your answer to one decimal place.)

(b) Suppose the EPA has established an average chlorine compound concentration target of no more than 58 mg/l. Does this wetlands system meet the target standard for chlorine compound concentration?

Explanation / Answer

a) 0.37*68.9+0.49*73.3+0.07*33.2+0.07*46.8=67.01 is the weighted average

b) Since the weighted average of chlorine compound concentration (mg/l) is more than the set standard of 58, it does not meet the target standard

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