Horizontal Storm Drain Piping

Capacities of horizontal storm drain piping systems.

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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
mm	inches	1%		2%		4%
mm	inches	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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Horizontal Storm Drain Piping

Capacities of horizontal storm drain piping systems.

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