Rainfall is an important parameter in the assessment of water resources projects. The normal annual rainfall is the average value of annual rainfall of year over a specified 30 year period. The 30 year normal is recomputed every decade. Normal annual rainfall is important in planning and design of hydraulic structures. The annual rainfall of Kadapa District for the period of 1910 to 2019 is collected from Water Resources Information Systems portal. The change in normal annual rainfall for every decade is calculated by using MS-Excel spread sheet, starting from 1910. Statistical parameters such as mean, standard deviation and coefficient of variation are calculated. The trend of maximum rainfall and minimum rainfall for every 30 years period is analyzed. Index of wetness is also calculated.
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M. Venkata Sowjanya (2024) studied this question.
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