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A Mound System for Onsite Disposal of Septic Tank Effluent in Slowly Permeable Soils with Seasonally Perched Water Tables¹

ABSTRACT

Slowly permeable soils with seasonal high water tables cannot be used for conventional subsurface disposal of septic tank effluent. An alternative mound system is described which consists of soil-covered seepage trenches on top of 60 cm of sand fill deposited on the original soil surface. The bottom area of the mound is sufficiently large to allow soil absorption of effluent considering the low conductivity of the subsoil, which was measured in situ with the crust test procedure. Monitoring data for four experimental mound systems and design and construction criteria are discussed.

Key Words: hydraulic conductivity • effluent purification

¹ Contribution from the Small Scale Waste Management Project, University of Wisconsin, Madison, WI 53703 (College of Agricultural and Life Sciences and College of Engineering) and University of Wisconsin-Extension. Funded by the State of Wisconsin, the Upper Great Lakes Regional Commission and the EPA (Grant No. R802874).

² Formerly Associate Professor of Soil Science, now Soil Scientist, Soil Survey Institute, Wageningen, Netherlands; Assistant Professor of Agricultural Engineering; Specialist, Sanitary Engineering; Specialist, Soil Science; and Specialist, Bacteriology, respectively.

Received for publication August 6, 1974.

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