Thenecessary length of a conventional septic drainfield trench as a function of the soil percolation rate and the anticipated daily wastewater flow from the building served. The field is a series of trenches that may be up to 100-feet long and 1 foot to 3 feet in width, separated by six feet or more, depending on local requirements
There is a table on the link
http://inspectapedia.com/septic/fiel...htm#fieldsize3
You may also want to check out this site :
http://inspectapedia.com/septic/septicdiag1.htm there is a chart down in the text "Soils Septic System Troubleshooting Chart"
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