Subrat Mangaraj
Countries irrigated by an adequate river system are in many ways blessed. These rivers not only help agriculture, but they provide a cheap and efficient transport system for the development of internal trade.
The saying goes—land divides, seas unite. But waterways bring also a good deal of misery to the people by causing devastating seasonal floods In India, for example, the sub-Himalayan regions of Uttar Pradesh, Bihar, Bengal and Assam are heavily flooded by the rivers of the Gengetic basin and the Brahmaputra, almost every rainy season. It brings untold sufferings to the people of these low-lying plains.
Millions are rendered homeless; men and cattle die in large numbers; the damage to property including standing crops is incalculable. Besides, floods affect the health of the locality and increase the incidence of cholera, typhoid and other water-borne diseases. In 1922 and 1998 flood in North Bengal left a trail of devastation, essentially in Malda, Murshidabad areas.
Floods are caused by an excessive flow of water in rivers during the rainy seasons, due mainly to torrential rain in catchment areas. This may be due to two natural causes. First, the melting of ice in glacier on the mountains may thus supply a river with volumes of water much in excess of its containing and carrying capacity.
Secondly, heavy rains on the mountains cause an excess of water supply. In either case, the excess water overflows the embankments and submerges the low-lying plains. Bursting of dams and also Bridges in protective embankments lead to inundation. This causes large-scale deforestation.
As for example, in the Terai regions during the war, floods destroyed the natural embankments of a river. Occasionally earthquakes, by changing the course of a river, or by raising its basin or choking and silting the riverbed cause flood Another contributory cause is the construction of railway bridges without leaving