Identification of Aquifer Zones in the Hard Rock Region of Central Parts of Adilabad District, Telangana State; Using Electrical Resistivity Method

Lohithkumar kethavath; Nagaraju Bhattu; R Sudarshan; Upender K; B. Madhusudan Rao

Volume : V, Issue : III, March - 2015

Identification of Aquifer Zones in the Hard Rock Region of Central Parts of Adilabad District, Telangana State; Using Electrical Resistivity Method

Lohithkumar Kethavath, Nagaraju Bhattu, R Sudarshan, Upender K, B. Madhusudan Rao

Abstract :

Adilabad district of Telangana, though, is bounded by perennial rivers like Godavari in the south, Penganga in the north and pranahita in the east has its problem of scarcity of water, in lean seasons, especially in the central hard rock region.The hard rock begins with the volcanic Deccan traps on the top and the peninsular granitic complex at the base with the quartzites etc. on the Pakhal group lying in between. The intratrappen sedimentary layer at the bottom of trap rocks, the dolomitic and phylytic shale and sandstones in the pakhal appear for the favorable for the ground water occurrence.Besides their litho groups the NW–SE treading lineaments and the NW–SW lineaments, cutting across which appear to represent structural faults might be helping occurrence and movement of ground water flow. It is in this context an area approximately150 sq.km has been related in the Deccan trap covered area located east of Utnoor. 70 Vertical Electrical Soundings (VES) were conducted with random distribution of locations with the main aim of locating bore–well points for irrigation, drinking water supply, but here we present discussion three profiles were chosen which consist of 24 VES Points. The maximum spread of current electrodes in the schulumberger survey is 120m (AB/2) , have in general revealed A&H type curves, and indicated 2, or 3 layers in the subsurface. Further, Resistivity and thickness values of VES points are different for each layer and it is observed that resistivity value varies from 3 ohm–m to 20 ohm–m with the thickness of 1.5m to 10m for the first layer and the second layer varies from 20ohm–m to 90ohm–m with the thickness of 15m to 70m and a final layer varies above 100ohm–m. On the basis of the resistivity and depth values together with local geology, nearly 11 VES points are suggested for drilling in the study area. The majority of drilled bore–wells are of 1000 –1500 GPH yield used for irrigation and drinking purpose.