Historical data of flash flood and trend analysis information for Uttarakhand, India

Historical data is always useful in interpreting any hazard-affected location. In this article historical data were gathered from various literature reviews, journals, newspapers, reports, and other sources to generate a flash flood map for Uttarakhand state, India. Between 1970 and 2020, a total of 122 sites were identified as being at risk of flash flooding. Moreover, several studies on rainfall trends at various scales have concluded that global warming is increasing extreme precipitation as well as extreme weather-related occurrences and risks. Therefore, high spatial resolution (0.25*0.25 degree) daily gridded rainfall data from the India Meteorological Department (IMD) was utilized to analyse the change in percentage from 1970 to 2020 for annual, pre-monsoon, monsoon, post-monsoon, and winter seasons