Delineation of Artificial Recharge Zones Using Geospatial Techniques in Sarabanga Sub Basin Cauvery River, Tamil Nadu

Abstract

A case study has been conducted to delineation of artificial recharge zones using geospatial techniques in Sarabanga sub basin Cauvery River, Tamil Nadu. The groundwater storage change from place to place and there isneed to identify recharge zones throughgeospatial technology as an important strategy for water management system.However conventional methods alone it is not an easy task to study the surface parameters of a large area to identify suitable sites for artificial recharge, since many controlling parameters must be independently derived and integrated, which involves additional cost, time and manpower. Modern remote sensing technologies have many advantages over older, conventional methods due to their synoptic coverage, improved spatial resolution, and their capabilities for multi-spectral and multi-temporal analysis. In addition, unlike conventional methods for demarcation of suitable areas for groundwater replenishment are able to take into account the diversity of factors that control groundwater recharge. Based on the GIS overlay analysis the possible combinations for recharge sites based on geology, geomorphology, lineament, lineament density, drainage density, Landuse and Landcover combinations covers an area of 915.052 Sq.kmand are suitable for various artificial recharge structures. The results show that by expanding the artificial recharge system, the recharge volume can be increased even for small flood events.