Identification of Groundwater Potential Zones in Khatav Tahsil using Geospatial Techniques

Abstract

The geospatial techniques like GIS, RS, cartography, spatial statistics etc. are used to well-organized planning of groundwater resources. In this study, base maps were prepared using digital image processing of RS data, digitization of existing maps in GIS for identification of Groundwater Potential Zones (GPZ). Four thematic layers, viz., geomorphology, drainage density, slope and lineaments were considered for identification of GPZ in the Khatav tahsil study area, Satara distract, Maharashtra. Administrative boundaries of sub circle belong to study area were superimposed over prepared thematic layers to know the circle wise outcome. Spatial data of thematic layers were assigned by ranks according to circle wise weights to their relative importance in groundwater occurrence. Final relative weight of four parameters (7-20) were used for identification of GPZ, like (1) high potential groundwater zone (< 11), (2) moderate potential groundwater zone (11 -18) and (3) low potential groundwater zone (> 18). Obtained results were also confirmed from dug well survey in the study area. The Vaduj and Katar Khatav circles ( 33.18 %) is falling in high potential groundwater zone and Pusegaon and Khatav circle (32.41 %) is belong with low potential groundwater zone.