Changes in extreme rainfall events and flood risk in ... - (IMD), Pune

Executive Summary1 Document title Changes in extreme rainfall events and flood risk in Indiaduring the last century2 Document type Research Report3 Issue No. NCC Research Report No. 3/20104 Issue date 23 rd December, 20105 Security UnclassifiedClassification6 Control Status Unclassified7 No. of Pages 228 No. of Figures 129 No. of reference 1810 Distribution Unrestricted11 Language English12 Authors/ Editors P. Guhathakurta, Preetha Menon, A. B. Mazumdar andO. P. Sreejith13 Originating National Climate Centre, Office of ADGM (R), IndiaDivision/Group14 Reviewing andApprovingAuthorityMeteorological Department, PuneAdditional Director General of Meteorology (Research),India Meteorological Department, Pune15 End users Disaster Managers, Hydrological planners andResearchers, Government Officials etc.16 Abstract The occurrences of some exceptionally very heavyrainfall during the recent years and causing flash floodsin many areas forced to study the long term changes inextreme rainfall over India. The study includes theanalysis of the frequency of rainy days, rain days andheavy rainfall days as well as one-day extreme rainfalland return period analysis in order to observe the impactof climate changes on Extreme weather events and floodrisk in India. The report will give some interesting findingswhich are very useful for hydrological planning anddisaster managements. It has been found that frequencyof heavy rainfall events are decreasing in major parts ofthe central and north India while increasing in thepeninsular India, east and north east India. Extremerainfall and flood risk is increasing significantlyparticularly in many regions of the country except someparts of central India.17 Key Words Extreme rainfall, return period, climate change, flood risk2