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Engineering ToolBox > Horizontal Storm Drains
Recommended size of horizontal storm drains below or above ground can be found in the table below. The drained area may be roofs, paved courtyards or similar.
| Area to be drained | |||||||
| Drain pipe diameter | Slope of | ||||||
| mm | inches | 1% | 2% | 4% | |||
| m2 | ft2 | m2 | ft2 | m2 | ft2 | ||
| 80 | 3 | 75 | 820 | 110 | 1180 | 150 | 1620 |
| 100 | 4 | 175 | 1880 | 245 | 2640 | 350 | 3770 |
| 150 | 6 | 495 | 5350 | 700 | 7550 | 995 | 10700 |
| 200 | 8 | 1070 | 11500 | 1515 | 16300 | 2135 | 23000 |
The table is based on a rainfall intensity of 100 mm per hour (4 inches per hour). The anticipated rainfall intensity should always be checked with the local authorities.