Riser and Roof Drain Size

Pipe Size Flow Capacity Rainfall Intensity (mm/hr)
50 100 150 175 200
mm. inch L/s CMH CFM GPM Catchment Area of Roof (m2)
50 2 1.45 5.22 3.07 23 101 51 34 29 25
80 3 4.22 15.19 8.95 67 298 149 99 85 74
100 4 9.08 32.69 19.25 144 643 321 214 184 161
125 5 16.46 59.26 34.90 261 1,165 583 388 333 291
150 6 26.75 96.30 56.71 424 1,895 948 632 541 474
200 8 57.60 207.36 122.11 913 4,082 2,467 1,360 1,166 1,020
250 10 104.41 375.88 221.35 1,655 7,401 3,700 2,467 2,114 1,850
300 12 169.83 611.39 360.04 2,692 12,035 6,017 4,012 3,438 3,008
375 15 307.87 1,108.33 652.68 4,880 21,821 10,910 7,274 6,234 5,455

Note

a) Flow capacities are based on stacks flowing 7/24 full.

b) Interpolation between rainfall rates is permitted.

Source

National Standard Plumbing Code, 2006, Chapter 13, Table 13.6.1

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