Identification of Groundwater Potential Zones by Using Remote Sensing Data in and Around Nandimandalam and Kothapalle, Kadapa District, Andhra Pradesh

摘要

An integrated survey based on satellite interpretation corroborated with limited field checks was carried out with a view to asses groundwater potential of Nandimandalam-Kothapalli of Kadapa district, Andhra Pradesh falling in Survey of India toposheet no. 57J/11. Under this study, 5 thematic maps, namely geological map (lithology and structure), geomorpho-logical map, hydromorphological map, land use - land cover map, lineament map and lineament density map were prepared covering an area of about 7200 km. The geological map portrays the area being covered by peninsular gneissic complex comprising mainly granite gneisses and granitoids intruded by basic dolerite dykes and acidic intrusive. The lineaments are associated with late acidic intrusive, fracture filled basic dykes, faults and alignment of stream segments, tanks, topography, etc. The geomorphological map depicts various landforms as structural hill, residual hill, intermontane valley, pediment, pediplain and flcod plain. The area has been classified into high potential, moderate potential, low potential and non potential for ground water development on the basis of hydromorphological studies. Some of the favourable locations have been suggested to impound the excessive run off so as to augment the ground water resources of the area. The land use pattern fall under the broad categories of agricultural land, forest land and waste land. The agricultural land is further subdivided into dry and wet agriculture land. Forest land has been classified into reserve forest and waste land vegetation. Social forestry programme include plantations and development of pasture lands, arrest of soil erosion by afforestration has been suggested.