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Item Limitations of a soil water budgeting method in estimating groundwater recharge with particular reference to the dry zone of Sri Lanka(National Science Foundation:Colombo, 2005) De Silva, R.P.Item Estimating the rate of recharge to the groundwater table using environmental chloride as a tracer(Faculty of Agriculture. Kamburupitiya, 1999) De Silva, R.P.Item The effect of length of time period considered in estimating groundwater recharge with a soil water budget model(National Science Foundation:Colombo, 2002) De Silva, R.P.