GEOELECTRICAL INVESTIGATION ON SUBSURFACE CONFIGURATION AND GROUNDWATER SALINITY IN INDIRA-GANDHI-CANAL COMMAND, WESTERN RAJASTHAN

Knowledge of sub-surface configuration and studies on perched water sa linity are important for efficient water management decisions in Indir a Gandhi Canal Command, western Rajasthan. Results of geo-electrical i nvestigations carried out at the Lunkaransar State Agricultural Farm i n the IG Canal Command, indicated that gypsiferous layer is responsibl e for the occurrence of perched water varied from 2 to 26 m in thickne ss. Highly saline water is encountered beneath it in confined conditio ns. Salinity levels of the perched water was found to be governed part ly by the nature of soils and partly by the subsurface flow of excess irrigation water.