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Affects of Sand Texture on Sidewall Absorption of Septic Tank Effluent

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Pp. 159-170 in On-Site Wastewater Treatment, Proc. Ninth Natl. Symp. on Individual and Small Community Sewage Systems (11-14 March 2001, Fort Worth, Texas, USA), ed. K. Mancl., St. Joseph, Mich. ASAE  701P0009.(doi:10.13031/2013.6025)
Authors:   S. P. Dix
Keywords:   Sidewall absorption, Sand, Fine sand, Long term falling head test, Septic tank effluent, Field test, Chamber, Aggregate, Trench

Side by side comparison of sidewall absorption in medium sand and fine sand shows that sidewall absorption plays a significant role in the release of effluent from a soil absorption system. Chamber sidewall is also compared to an aggregate sidewall, with a significant difference in upper sidewall evident using this media. Variation in absorption with depth indicates that fringe length will have a greater influence than sidewall height in the performance of a trench in the two sand media tested. Fines sand run consistently slower over the range of depth without the upper fringe efficiency observed in the coarser media.

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