22. Trench length: The total length of the absorption trenches of a soil absorption field that serves an isolated dwelling must comply with the standards in the following table, according to the origin of the effluent and the number of bedrooms:
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Number of bedrooms Total length of trenches (metres)
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Effluent from a Effluent from a
primary treatment secondary treatment
system system
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1 45 30
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2 65 43
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3 100 66
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4 130 87
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5 165 110
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6 200 133
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The total length of the absorption trenches of a soil absorption field that serves another building must comply with the standards in the following table, according to the origin of the effluent and the total daily flow:
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Total daily flow (litres) Total length of trenches (metres)
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Effluent from a Effluent from a
primary treatment secondary treatment
system system
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0 to 540 45 30
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541 to 1080 65 43
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1081 to 1620 100 66
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1621 to 2160 130 87
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2161 to 2700 165 110
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2701 to 3240 200 133
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