This book is about the comparision of costs and benefits of alternative dyke constructions (seasonal August dykes and permanent High dykes) for agricultural production in Vietnam's Mekong Delta, using a case study of three communes in flood-prone areas of An Giang province. The research's findings from this book show that the August dyke system provides the highest net agricultural benefits than either No dykes or High dykes in the areas of No dykes of the Mekong Delta was supported. The government policy should focus on exploiting of the flood benefits using August dykes and minimising the High dyke development in the region.