Rainfall intensity-duration frequencies for India, for local drainage design
Meteorological Office, New Delhi (Received 17 February 1960) of any return period for a given duration is the maximum amount of rainfall in that duration which will be equalled or exceeded once every 'n' years on the average, over a long period of time. Hence, intensities of rainfall of different durations, from a few minutes to say, 24 hours and for various returns periods from 2 years upto 40 or 50 years over all parts of India will be the data required for fixing the design flood of the local drainage structures.
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