Flood and Hydrological Water Discharge in Rishikesh CityAssessment of Flood and Hydrological Water Discharge in Rishikesh City

The rivers are life line for human being and these are also a disaster for human as well in monsoon season rivers become disaster in India.The study is focused on occurrence of flash flood in Rishikesh city with rainfall data and water discharge level data of Ganga River.The climate data was processed with the help of Mann Kendall test to observe the trend of surge in water level which is potential threat of flash flood in the city.There was increasing trend in the rainfall of the months of July (0.21), August (1.11),September (0.98) and October (2.21) for last 44 years which was more than significant value.The flood frequency analysis method was used to observe the frequency of occurrence of flash flood in the city.The study shows that 448 occurrence of surge is observed in last 44 years.There was 13 occurrence of flash flood events observed in last 448 surges.The river's normal flash floods is occur at 28177 m3/s, with an arrival time of around every three years, as shown by the flood peak data.The data analysis shows that the most extreme flood was recorded in 2013.