Draining Roof Areas by Vertical Downspouts

Capacity of vertical downspouts

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The capacity of vertical downspouts draining roof areas can be found in the table below.

Downspouts Size Roof Area
mm inches m2 ft2
50 2 65 700
65 2 1/2 120 1300
80 3 205 2200
100 4 430 4600
150 6 1255 13500

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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