00390 a2200121 4500020001500000082001500015100002000030245010700050260003000157300002000187440003800207650002300245 a9290901349 a631.7bNIJ aNijman, Charles aIrrigation management processes and conditionsba case study of Sri Lanka's walawe improvement project aColombobIIMIc1991g1991 axxx,277p.c21cm aIIMI Country Paper Sri Lanka No.8 awater Conservation