TY - SER AU - Elkaduwa, W.K.B. TI - Use of historical data as a decision support tool in watershed management: A case study of the upper Bilwala Basin in Sri Lanka / W.K.B, Elkaduwa and R. Sakthivadivel SN - 9290903775 SN - 1026-0862 PY - 1999/// CY - Sri Lanka: International Irrigation Management Institute KW - WATER RESOURCES MANAGEMENT N1 - Hadiah Tan Sri Dato' Ir. Hj. Shahrizaila Abdullah ER -