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Geological Society, London, Special Publications; 2008; v. 288; p. 121-135;
DOI: 10.1144/SP288.10
© 2008 Geological Society of London

Articles

Application of isotope techniques in groundwater recharge studies in arid western Rajasthan, India: some case studies

U. K. Sinha & S. V. Navada

Isotope Hydrology Section, Isotope Applications Division, Bhabha Atomic Research Centre, Trombay, Mumbai - 400 085, India (e-mail: udayks{at}apsara.barc.ernet.in)

Environmental isotope studies of groundwaters carried out in the arid region of Rajasthan, India, suggest that recharge to shallow groundwater occurs as a result of direct infiltration of precipitation and/or through river channels during episodic floods. In many parts of Rajasthan deep fresh groundwater is available, which was recharged in the past when the climatic conditions were more favorable than at present. However, negligible modern recharge and over-exploitation of groundwater resources have led to the deterioration of groundwater quality in the Bhadka–Bheemda area of Barmer district. Buried river courses (palaeochannels) could be potential sources of groundwater since radiocarbon measurements of groundwater along palaeochannels in Jaisalmer district revealed that it was old water recharged a few thousand years ago.