The Ontario Building Code | Hydraulic Loads on Sanitary Horizontal Drain

7.4.10.8. Hydraulic Loads on sanitary Horizontal Drain

(1) Except as permitted by Article 7.4.10.7., the hydraulic load that is drained to a horizontal sanitary drainage pipeshall conform to Table 7.4.10.8., based on the sizeand slope.

(2) Horizontal sanitary drainage pipe shall be designed to carry no more than 65% of its full capacity.

Table 7.4.10.8.
Maximum Permitted Hydraulic Load Drained to a Horizontal sanitary Drainage pipe

Forming Part of Sentences 7.4.10.6.(2) and 7.4.10.8.(1)

Item	Column 1	Column 2	Column 3	Column 4	Column 5	Column 6	Column 7
	Drain Size, Nominal in.	Maximum Hydraulic Load, fixture units
		Slope(1)
		1 in 400	1 in 200	1 in 133	1 in 100	1 in 50	1 in 25
1.	3	---	---	---	---	27	36
2.	4	---	---	---	180	240	300
3.	5	---	---	380	390	480	670
4.	6	---	---	600	700	840	1300
5.	8	---	1400	1500	1600	2250	3370
6.	10	---	2500	2700	3000	4500	6500
7.	12	2240	3900	4500	5400	8300	13000
8.	15	4800	7000	9300	10400	16300	22500

Notes to Table 7.4.10.8.:

⁽¹⁾ Slope is the ratio of rise to run, in whatever measurement units are chosen.