Sri Lanka Atomic Energy Board

Southwestern part of Sri Lanka receives rain from southwest monsoon rain and convectional rains during inter-monsoon seasons. They contribute surface water runoff and groundwater recharge in wet zone. Semi-arid zone receives rain from convectional process and due to depression in limited time period of the year. Isotopic (¹⁸O and ²H) composition of the rain vary with altitude, latitude and distance from the coast, etc due to fractionation of isotopes during evaporation, condensation and diffusion of water vapor. Surface water runoff and groundwater recharge are solely depend on the rainfall. Therefore understanding the rain process and its variation are important to see the rainfall variation and their impact on groundwater bodies. In this context, isotope technique in hydrology plays an important role to study the above processes. Therefore collection of isotopic data of rain in wet zone and semi-arid region as baseline information is important for the future groundwater and climatic investigations in Sri Lanka.

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