Rainfall Analysis CPHEEO MANUAL ON STORM WATER DRAINAGE (PART-A) 2019 - Printable Version

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Rainfall Analysis CPHEEO MANUAL ON STORM WATER DRAINAGE (PART-A) 2019 - Manish Jain - 03-18-2021

Rainfall Analysis
CPHEEO MANUAL ON STORM WATER DRAINAGE (PART-A) 2019 

Rainfall analysis is carried out to identify and sort out various magnitudes (intensities) of rainfall events and their corresponding durations occurring at a station from a continuous series of historical rainfall records taken for a fairly long period viz. last 25 - 30 years or more. IDF curves are not static as they are influenced by change in pattern of rainfall and therefore IDF curve should be prepared at an interval of 5 – 10 years for accurate results. The rainfall analysis helps to establish intensity-duration-frequency relationship for various frequencies which are used in estimation of runoff for design of storm water drains. The frequency or return period of a storm event may be defined as the average recurrence interval between events equal to or exceeding a specified magnitude. Thus, if it is stated that the return period of rainfall of 20 cm in 24 hours is 10 years at a certain station A, it implies that on an average rainfall magnitudes equal to or greater than 20 cm in 24 hours occur once in 10 years.

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