Perera, H.D.B.S. Vidanage, S.P. Kallesoe, M.F. Multiple benefits of small irrigation tanks and their economic value - a case study in the Kala oya basin, Sri Lanka - IUCN Colombo 2005 - 34p. - Kala oya Sri Lanka Agricultural irrigation Irrigation Small tanks Wetlands Nat. Bib. No.: P 3583 Nat. Bib. Agency Control No.: 631.67(548.7) PER Subjects--Topical Terms: Agriculture Universal Decimal Class. No.: 631.67(548.7) 1