What is the recommended size of rain water pipe?

The size of rain water pipes is determined on the basis of area of the roof to be drained and on the average rate of rainfall in the area.

SIZES OF RAINWATER PIPES FOR ROOF DRAINAGE

S No.	Diameter of pipe	Average Rainfall in mm/hour
S No.	Diameter of pipe	50	75	100	125	150	200
	(mm)	Roof areas in square meters
1	50	13.4	8.9	6.6	5.3	4.4	3.3
2	65	24.1	16.0	12.0	9.6	8.0	6.0
3	75	40.8	27.0	20.4	16.3	13.6	10.2
4	100	85.4	57.0	42.7	34.2	28.5	21.3
5	125	-	-	80.5	64.3	53.5	40.0
6	150	-	-	-	-	83.6	62.7

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