Citation:Jayasumana, M.A.C.S, Paranagama, P. A., Amarasinghe, M.D., Fonseka and S.I, Wijekoon, D.V.K. (2011) c, Proceedings of The Water profssionals'day Symposium, Water Resources Reserch in Sri Lanka, Faculty of Agriculture, University of Peradeniya, 127-141.