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.