Analysis of Monthly and Daily Annual Extreme Precipitation for Urban Vadodara

Human intervention due to change in landuse landcover, emission of greenhouse gases and aerosols affects local climate. Spatial analysis of long term annual rainfall and very wet days of 5 years’ time window of rural and urban stations of Vadodara district reveals that urban annual rainfall is rising as compared to surrounding peri-urban and rural rainfall. One-day annual extreme rainfall is important for understanding and establishing impacts of climate change. Information about occurrence of extreme precipitation is of utmost importance for flood mitigation. One-day annual extremes and consecutive 5 day extremes are important for research in climate change. If the likelihood or probability of occurrence of month of extreme value is known in advance, it can play, big role in preparedness of local governing bodies in tackling resulting problem due to extreme event. One-day annual extremes can give clear picture about flash flood occurrence. This study analyzes monthly one-day annual extreme values for a period of 90 years for Vadodara. It helps us to analyze the pattern of occurrence and more specifically month of occurrence for one-day extremes. GEV distribution for June, July, August, September and October month in one-day extreme annual rainfall series was fitted. Results show gradual change in pattern of occurrence for months of July and August with occurrence of one-day annual extreme gradually converging towards July.