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Rainfall Draining of Roof Areas and Vertical Downspouts

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Capacities of clean vertical downspouts without obstructions when draining roof areas are indicated below:

Rainfall Draining of Roof Areas and Vertical Downspouts
Downspouts SizeRoof Area
mminchesm2ft2
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 rainfall intensity 100 mm per hour (4 inches per hour). Rainfall intensity should always be checked with the local authorities.

Gutters and downspouts are vulnerable for obstructions caused branches and leafs from surrounding trees and similar. This should be considered when connecting gutters and downspouts.

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Related Topics

Sanitary Drainage Systems

The purpose of the sanitary drainage system is to remove effluent discharged from plumbing fixtures and other equipment.

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Rainfall on Roofs and Gutter Slopes

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Run, roof slope, gable height and gable area.

Roofing Materials - Weights

Weight calculator for roofing materials.

Storm-Water Conductors

Roof drain capacities.

Storm-Water Runoff Coefficients vs. Surface

Storm-water runoff coefficients for various surfaces

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