Abstract

AbstractIn the Damodar River Basin, the streamflow is scientifically controlled and regulated by the five large dams (viz., Panchet, Maithon, Konar, Tilaiya, and Tenughat) since the 1950s to manage irrigation water and floods in West Bengal, but currently, the water holding capacity of Damodar River and DVC (Damodar Valley Corporation) reservoirs (including Durgapur Barrage) is reduced due to siltation and lack of maintenance. For that reason, the recurrent flood events of each year, with minimum critical discharge of 1651–1822 m3s−1, are triggered in the low-lying floodplains of Purba Bardhaman, Hooghly, and Howrah districts. The channels of lower Damodar basin (viz., Mundeswari and Damodar/Amta) are supposed to drain 7079 m3s−1 of water, but these are actually able to handle only 2832 m3s−1 of water during monsoon months. Nowadays, the government officials of West Bengal have blamed the flood regulation system of DVC, and they characterized this flood phenomenon as “man-made hazard.” Using advanced geospatial techniques, the present study tries to encompass the key factors of hydrometeorological floods and contemporary flood dynamics in the lower Damodar River Basin (Damodar fan-delta region of West Bengal), viz., analysis of flood-generated rainfall events, rainfall–runoff simulation, prediction of probable maximum flood, dam-included changes in flood hydrology, and 1D hydrodynamic flood model of steady and unsteady flow.KeywordsFlood frequency analysisCurve number1D hydrodynamic modelMann-Kendall testDamodar River BasinHEC-RAS

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