The area chosen for aquifer mapping is divided into East Karbi Anglong and west Karbi Anglong districts. Karbi Anglong District is situated at the central part of Assam. It is surrounded by the district Golaghat and Nagaland State in the east, by Meghalaya state and Morigaon in West, by Nagaon district in the North and by Dima Hasao district and in parts by Nagaland in the South. Districts of East Karbi Anglong and West Karbi Anglong is separated by Hojai district. Drainage pattern of Karbi Anglong district appears to be of radial dendritic pattern. It develops in regions underlain by homogeneous material. That is, the subsurface geology has a similar resistance to weathering so there is no apparent control over the direction the tributaries take. Geologically Karbi Anglong plateau is known as the oldest landform in Assam. It is pear-shaped and has an area of about 7000 km2. The entire study area is covered by regular monitoring of existing 33 Ground Water Monitoring Stations and another 05 key wells have been established.