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The design diagrams to the left are for a typical residential wastewater constructed wetland. This is only an example, each wetland design will differ based on soil conditions, usage requirements, as well as state and local laws.

The constructed wetlands studied in this research project were designed in part using TVA guidelines, based on a two cell system for each cell in average soil. The first cell is lined and filled with 14 inches of gravel, the water level is kept at 12 inches to insure subsurface flow. The second cell, which is unlined, also contains the 14 inches of gravel and 12 inches of water. It is constructed at a slightly lower elevation to allow gravity flow from the first cell into the second. The size of the second cell should be matched with the infiltration/soil characteristics of the soil. A minimum of 2 -3 day hydraulic retention time is recommended for effective treatment.
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