Lakhimpur district is divided into two sub divisions viz. North Lakhimpur and Dhakuakhana and seven revenue circles and nine civil blocks. Total population of the district is 10,42,137 souls (as per 2011 census) with average population density of 458 persons/sq.km. Physiographically the area can broadly be divided into three parts, i.e., the hilly tract, the foothill region and the extensive flood plain created by the river Brahmaputra and its tributaries in southern part. The hilly tracts comprise Siwalik sediments of lesser Himalayas. From the examination of this litholog it is observed that down to a maximum explored depth of 200 m the sequence is dominated by gravel, sand, clay and boulders. The lithologs and the lithology identified in VES survey are used to understand 2D and 3D disposition of aquifer.