According to the Economic Survey, Assam for 2013-14 tabled in the Assembly during the ongoing Budget session, the average annual loss due to flood in Assam is to the tune of Rs 200 crore and in 1998, the loss suffered was about Rs 500 crore.
During 2004 it was about Rs 771 crore, the document said. The survey also pointed out that the national average of flood-prone area in the state was about a quarter of the total land area of the state.
"The flood-prone area of the state is 31,500 sq km as assessed by the Rastriya Barh Ayog which is about 39.58 per cent of the total land area of Assam. This is about 9.4 per cent of total flood-prone area of the whole country," it said.
The survey said the flood-prone area of India as a whole stands at about 10.2 per cent of the total area of the country. "Records show that average annual area affected by flood (in Assam) is 9.31 lakh hectares. The flood protected area of the state is 16,500 sq km (16.5 lakh hectares) till date," the survey pointed out.
Besides, the scale of the problem has grown with massive erosion, which stands at an average rate of 8,000 hectares every year in the state with a total of 4.27 lakh hectares of land having been washed away since 1950.
During post Independence period, Assam faced major floods in 1954, 1962, 1972, 1977, 1984, 1988, 1998, 2002 and 2004, the survey said.