(1) The total length of leaching chamber shall,
(a) not be less than 30 m when constructed as a shallow buried trench, or
(b) not be less than 40 m for any other absorption trench.
(2) Except as provided in Sentences (1) and (3), the total length of leaching chamber shall not be less than the value determined by the formula,
L = QT/200, for a Type I leaching chamber, or
L = QT/300, for a Type II leaching chamber,
where,
L =total length of leaching chamber in metres,
Q =the total daily design sanitary sewage flow in litres, and
T =the design percolation time.
(3) When a treatment unit described in Article 8.6.2.2. is used in conjunction with a leaching chamber, the total length of leaching chamber shall not be less than the value determined by the formula,
L = QT/300
where,
L =total length of leaching chamber in metres,
Q =the total daily design sanitary sewage flow in litres, and
T =the design percolation time.
(4) Except as provided in Sentence (1), where the leaching bed is constructed as a shallow buried trench, the total length of leaching chamber shall not be less than the value determined by Table 8.7.3.1A.