Integrated approach for identification of potential groundwater zones in Seethanagaram Mandal of Vizianagaram District, Andhra Pradesh, India

Journal of Earth system science

N C Mondal1¹  S N Das2²  V S Singh1¹ 

[1] National Geophysical Research Institute, Hyderabad 500 007, India.$$;Action for Food Production (AFPRO), Hyderabad 500 007, India.$$

关键词: Groundwater;    hard rock;    Vertical Electrical Soundings;    Down-The-Hole Hammer;    pumping test;    Seethanagaram Mandal.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

Identifying a good site for groundwater exploration in hard rock terrain is a challenging task. In hard rocks, groundwater occurs in secondary porosity developed due to weathering, fracturing, faulting, etc., which is highly variable within short distance and contributing to near-surface inhomogeneity. In such situations topographic, hydrogeological and geomorphological features provide useful clues for the selection of suitable sites.Initially, based on satellite imagery, topographical, geomorphological and hydrogeological features, an area of about 149km2 was demarcated as a promising zone for groundwater exploration in the hard rock tract of Seethanagaram Mandal, Vizianagaram District, Andhra Pradesh, India. A total of 50 Vertical Electrical Soundings (VES) were carried out using Wenner electrode configuration. An interactive interpretation of the VES data sharpened the information inferred from geomorphological and hydrogeological reconnaissance. Ten sites were recommended for drilling. Drilling with Down-The-Hole Hammer (DTH) was carried out at the recommended sites down to 50 to 70m depths. The interpreted VES results matched well with the drilled bore well lithologs. The yields of bore wells vary from 900 to 9000 liters per hour (lph).

【 授权许可】

Unknown