Flood Frequency Analysis of Jiadhal River Basin, India using Log Pearson Type III Distribution Method

Abstract

Flood is considered as the most widespread and disastrous natural calamity in the world which adversely affects the socio-economic condition and lives of the people living within the floodplain areas of the world. The Jiadhal River basin of Dhemaji district, Assam experiences a high magnitude of flood almost every year, leaving the people of that area in jeopardy. In this regard, flood frequency analysis is considered an important step for proper planning and managing the region in terms of floods. Flood frequency analysis (FFA) is one of the utmost important and necessary measures taken to develop any floodplain region. In this present study, a FFA of the Jiadhal River Basin is carried out using the Log Pearson Type III (LP3) probability distribution method which is used to predict future flood events based on historical records. The data used in the study was for a period of 46 years. The method was used to predict the flood discharge estimations at 2, 10, 25, 50 and 100 years recurrence period. The result says that after 10 years the return period will surpass the water-carrying capacity of the Jiadhal River.