The study area of the parts of East Garo Hills and South Garo Hills District spread over 627 km2 falling under Survey of India Toposheet No. 78K/10 lying between North latitudes 25 30' to 25 45' and East longitudes 90 30' to 90 45'. Physiographically the area can be described as highly dissected curvilinear/rectilinear hill ranges separated by valleys. The highest elevation is 688 m above msl at Misakokdok in west central part and the lowest elevation is 100 m above msl along Damringriver in north west. Geologically, the area is underlain by rock units belonging to Older Metamorphics represented by amphibolite, banded magnetite quartzite (BMQ) and calc granulite of Archaean to Palaeoproterozoic age and Assam-Meghalaya Gneissic Complex represented by augen gneiss, granite gneiss and migmatite of Archaean to Proterozoic age. These rocks are in turn intruded by Neoprotozoic to lower Palaeozoic age granite and porphyritic granite of Mylliem Granite and Sylhet trap of Jurassic to Cretaceous age. Exploration data reveals the presence of semi-confined to confined, moderate to deep aquifer system comprising of fractured hard rocks, namely, Granitic gneiss, pegmatite and dolerite in the study area. Two to three sets of fractures were encountered between 33.0 – 200.0 m bgl depth. The first two fracture zones are in general occurring between 33.0 – 100.0 mbgl depth and the third promising fracture zone was encountered below 100.0 m bgl depth.