Bihar Hazard Profile
Bihar’s topography is marked by a number of perennial and non-perennial rivers of which, those originating from Nepal are known to carry high sediment loads that are then deposited on the plains of Bihar. A majority of the rainfall in this region is concentrated in the 3 months of monsoon during which the flow of rivers increases up to 50 times causing floods in Bihar. 68800 sq km out of a total area of 94160 sq km, an estimated 73% per cent of the total land area in Bihar is vulnerable to flood . Annual flooding in Bihar accounts for about 30-40% of the flood damages in India; 22.1% of the total flood affected population in India is reported to be located within the state of Bihar. 28 districts of Bihar fall under most flood prone and flood prone districts.
Bihar is located in the high seismic zone that falls on the boundary of the tectonic plate joining the Himalayan tectonic plate near the Bihar-Nepal Border and has six sub-surface fault lines moving towards the Gangetic planes in four directions. Major parts of the state are classified under in seismic zone IV and V by the Vulnerability Atlas of India, i.e. as having high earthquake vulnerability with the potential to cause very high degree of devastation. In all, 15.2% of the total area of Bihar is classified under Zone V and 63.7% of the total area of Bihar falls in Zone IV. Of the 38 districts, 8 districts fall in seismic zone V while 24 districts fall in seismic zone IV and 6 districts in seismic zone III with most districts falling under multiple seismic zones (i.e. either seismic zone V & IV or seismic zone IV & III). The state has in the past experienced major earthquakes; the worst was the 1934 earthquake in which more than 10,000 people lost their lives, followed by 1988 earthquake.
Though the climate of Bihar is favourable for production of various crops, the agriculture of the state is dependent on behaviour of monsoon and distribution of rainfall. Although the average rainfall in the state is 1120 mm, considerable variations occur between the different parts of the State. Large part of the state is now increasingly vulnerable to drought due to climate change. In the absence of adequate rainfall, most part of Bihar including North Bihar which is prone to floods faces drought situations. South and South West Bihar are more vulnerable and often experiences severe drought situations.
Other Hazards :-
Apart from the above hazards, the state is also prone to cold and heat waves, Cyclonic storms (high speed winds) and other human-induced hazards like fire, epidemics, road / boat accidents, stampedes etc. Incidences of fire are mainly local in nature but have a severe impact on villages. Since a majority of Kucha houses have thatch roofs and wooden structures, in the summer months when winds are high, fires from the traditional stoves spread to damage entire villages.
Bihar – Official website – http://disastermgmt.bih.nic.in/
Hazard Profile – Flood, Drought, Fire and Earthquake
Control Room – 0612-2217305, 0612-2217305
Shri Nitish Kumar