Wetlands: Where does all the water go? According to the Environmental Protection

Question

Wetlands: Where does all the water go? According to the Environmental Protection Agency (EPA) in a typical wetland environment, 38% of the water is outflow, 47% is seepage, 7% evaporates, and 8% remains a water volume in the ecosystem. (Reference: U.S. 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 64.1, seepage 75.8, remaining due to evaporation 23.9, in the water volume 68.2.

a) Compute the weighted average of chlorine compound concentration in milligrams per liter (mg/l) for this ecological system.

Explanation / Answer

Here Multiply the amount of chlorine in each part of the ecosystem by the % of water they represent in the wetland environment.

38% of the water is outflow,

47% is seepage,

7% evaporates,

and 8% remains a water volume in the ecosystem

Wtd. Avg. = (64.1*38%) + (75.8*47%) + (23.9*7%) + (68.2*8%)
= 24.358+35.626+1.673+5.456
= 67.113 mg/L

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