Vol. 11, Special Issue 11 (2022)

In Prakasam district of Andhra Pradesh out of 57 mandals 15 mandals were selected under APDMP (Andhra Pradesh Drought Mitigation Project) project in Prakasam district. All the fifteen mandals received highest rainfall during the September and October months. During the month of June and July months, where the farmers will sow most of the rainfed crops, less than 50 mm of rainfall was recorded in some mandals. Uneven distribution of rainfall, affect the agricultural production remarkably. However, prolonged dry periods affect the final crop production. Monsoon is an important season for water supplies, from surface reservoir The daily rainfall data was collected for each mandal of Prakasam district for the period of 30 years (1989-2018) and it was to be summed up on meteorological weekly, monthly, seasonally, annual basis for each mandal of Prakasam district basis for the study of rainfall characterization. The results indicated that the normal annual mean rainfall in selected mandals ranged from 504.1 to 747.7 mm. The mean of annual basis total rainfall was ranged between 504.1 mm in Pedaaraveedu and 747.7 mm in Marripudi. The weekly highest rainfall on annual basis was recorded in Ardhaveedu (48.2 mm) in the 40th MW and lowest weekly rainfall was recorded in Giddalur (31.0 mm) in the 42 MW. The seasonal distribution of Prakasam district was obtained in winter season (9.2 mm), in summer (69.3 mm), in monsoon (348.02 mm), in post monsoon (239.3 mm. Here, the results indicated that the onset of monsoon was observed in 23th MW and withdrawal in 43rd MW in Prakasam district. It showed that average rainfall of Prakasam district is 679.8 mm with 39.6 rainy days per year.