8.3 Average frequency of heavy rainfall days District wise average number of stations recording heavy (64.5-115.5 mm), very heavy rainfall (more than or equal to 115.6 mm) based on 2004 to 2020 rainfall data during the Southwest monsoon season is calculated and presented in Fig. 17 & Table.10. Average pattern of the heavy rainfall events are similar to the average pattern of rainy days. Higher number of heavy rainfall events occurred more over northern districts (Adilabad, Kumuram Bheem, Nirmal, Kamareddy, Jagtial and Mancherial) of the state as compared to districts from the southern part (Mahabubnagar, Wanaparthy, Narayanpet, Jogulamba Gadwal, Nagarkurnool). Also heavy rainfall events are observed over eastern districts (Mulugu, Jayashankar, Bhadradri Kothagudem, Khammam and Warangal Rural) of the state during the season. Year wise from 2004 to 2020, Number of stations recording Heavy, Very Heavy rainfall per day plots during the Southwest monsoon season is given in Fig. 18. It shows, during the last 16 years, both heavy and very heavy rainfall received days shown an increasing trend in number of heavy, very heavy rainfall days.
Fig.17 District wise average number stations recording heavy, very heavy rainfall during the Southwest monsoon from 2004 to 2020. 36
