Disaster Management - 2008 Bihar Flood

Introduction It was maven of the most black floods in the history of Bihar, an warrant and thickheadedly populated order in India. A flummox a variance in the Kosi embankment  around the Indo-Nepal border (at Kusha in Nepal) occurred on 18 sublime 2008. The river changed move and touch the sectors which hadnt experienced floods in many another(prenominal) decades. The flood affected over 2.3 cardinal sight in the Union part of Bihar. incident On 18 August 2008, laboured monsoon rains and poor aid caused a ravish in the Kosi embankment. weewee passed through the breach at an estimated 129,800 m³/s, inundating hundreds of villages in northern Bihar. The flood go under most of the Kosi alluvial caramel area, which is real fertile, with a dense agrarian population. Background The Kosi Rivers velocity basin in southern Tibet and easterly Nepal has close to 60,000 km² of hilly terrain, a region that architectonic forces are elevating by about(predicate) 1 cm a year. If erosion keeps pace with the uplift, an estimated 600 zillion three-dimensional meters of sediment is potentially carried downstream in an reasonable year. However, verifiable measurements of the rivers sediment commove have given estimates of ascorbic acid million cubic meters annually, indicating that the area is rising.

River gradient ranges from more than 10 meters/km for major upper tributaries in the mountains to as diminished as 6 cm/km as the chat Kosi nears the  gang up. As the gradient decreases on the plains, current slows and agitation that holds sediments in interruption diminishes. Sediments condescend out and are deposited on the riverbed. This process finally raises a channel above the adjoin terrain. The river breaks out, seeking lower terrain, which it again proceeds to elevate by deposition. This creates a conic alluvial fan. The Kosi alluvial fan is one of the largest in the world, coating some 15,000 km² and extending 180 km from the outermost foothills of the Himalayas to the Ganges river valley. overeat waters naturally paste out...If you want to dismount a full essay, order it on our website: Orderessay

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