Flood Frequency Analysis of Mayurakshi River: A Geographical Appraisal of Narayanpur

Author(s): Anwesha Mondal and Sanat Kumar Purkait

Abstract:

Flood is one of the most significance natural phenomena which sometimes emerged as natural hazards and disasters because of its extensive ability to damage of human life and properties to access the flood situation of any river basin at difference scales it is really required to measure water level and discharge of the respective river. Flood is a frequent occurrence in the Mayurakshi River basin of Eastern India. However, in recent decades, it has become increasingly irregular, with a significant rise in frequency. The aim of this project is analysis risk of the river site Narayanpur with the help of Normal and Gumble Distribution. The data represents peak annual water level 1978-2011. Gumbel distribution with parameters estimated by method of moments has the best upper tail fit (from Table: D-Index). Hence this should be used for necessary decisions concerning maximum values. RMSE for Gumbel distribution though, is slightly higher than that of Normal distribution. This implies that Normal distribution can be used for making decisions except from maximum values. In our present setup, we are concerned about yearly maximum of gauge values. Therefore, Gumble is the more suitable option. With the help decision future construction like dam, barrage etc. will be success.

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