The Hadabima Authority of Sri Lanka before, The National Agricultural Diversification and Settlement Authority (NADSA) was established by the Gazette Extraordinary Notification No. 302/12 issued on 02nd February 1978 in terms of the provisions of the Agricultural Corporations Act 1972.
The Authority has been vested with the legal provisions to perform the following tasks by the said Gazette Notification,

1. Preparing plans for agricultural diversification, settlement development and fully integrated watershed management and coordinating and implementing plans through the Corporation or through the Government or non-governmental agencies in the areas determined by the Minister.
2. Management of all lands vested with or assigned to the Corporation with the objective of ensuring maximum productivity, environmental protection, conservation of land and water resources and settlement development.
3. Preparation and marketing of agricultural products.
4. Establishment, maintenance and operation of plants, equipment and machinery for agricultural diversification and settlement development.