What is the recommended size of rain water pipe?

Number and size of pipes for rainy water is determined by the area of the roof to be drained and on the basis of the average rate of rainfall in the area. The pipes for rainy water should normally be sized on the basis of roof areas as given below.

SIZING 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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