Piyadasa, R.U.K., Weerasinghe, K. D. N., Kumara, D. S. E., Liyanage, J. A. and Maire, D (2005); Hydro geochemical distribution and characteristics of groundwater in Weligama area in Southern Sri Lanka. The international journal of Tropical Agricultural Research and Extension. http://tare.sljol.info/. Faculty of Agriculture, University of Ruhuna Sri Lanka pg 8-106. ISSN: 1391-3646