The Ontario Building Code | Loading Requirements
220.127.116.11. Loading Requirements
(1) The effective area of the surface of the filter medium in each filter bed shall be at least 10 m2 and not more than 50 m2.
(2) The area described in Sentence 18.104.22.168.(1) shall be designed such that the loading rate does not exceed, for soil having a percolation timeset out in Column 1 of Table 22.214.171.124., the maximum value set out opposite it in Column 2 of Table 126.96.36.199.
(3) Except as provided in Sentence (5), where the total daily design sanitary sewage flow does not exceed 3 000 L, the effective area shall be such that the loading on the surface of the filter medium does not exceed 75 L/m2 per day.
(b) the leaching bed shall be comprised of more than one filter bed, each of similar size and adjacent to each other.
(5) Where a Level II, Level III or Level IV treatment unit as described in Table 188.8.131.52. is used in conjunction with a filter bed, the effective area shall be such that the loading on the surface of the filter medium does not exceed 100 L/m2 per day.