Horizontal Storm Drains

Capacity of horizontal storm drain piping

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.

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