Kokrajhar district is situated on the north bank of the river of Brahmaputra. The district has three sub- divisions, viz., Kokrajhar Sadar, Gossaigaon and Parbatjhora. Physiographically, the district can be divided into two units i) Northern alluvial region and 2) Southern swamps or flood plains of the river Brahmaputra. The area is characterised by two different land forms, viz Inselbergs and alluvial plains. Geomorphologically, the area can be classified into six divisions: active flood plain, younger alluvial plain, older alluvial plain, piedmont alluvial plain, older flood plain and highly dissected structural hills and valleys. Based on the analysis of interpreted data of geophysical studies, the study area consists of older alluvium and newer alluvium consisting of sand with cobbles, pebbles, boulders and clay. The aquifers are consisting of sands of various grades with gravel that are suitable for construction of both shallow and deep tube wells.