Azhutha block is located in the southern part of Idukki district with geographical area coverage of about 1250 sq.km (Fig 1). The area comes under Periyar basin and majority of the land is covered by thick tropical rain forest. Geomorphologically, the area is covered by denudational hills and valleys with average elevation ranges from 500 to 2000 m amsl. Geologically, the area is covered by charnockite and in places, hornblende biotite gneiss. The weathering depth of bed rock varies from 0 to 10 m. Ground water occurs in phreatic condition in the weathered crystalline rocks and under semi-confined condition in the deep fractured crystalline rocks. Groundwater is mainly developed through dug wells and shallow bore wells in the study area.