Is Small Better?
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Oxford University Press on behalf of the World Bank
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We estimate and compare the effects of small and large irrigation dams on cropland productivity in South Africa. To this end, we construct a panel data set of South African river basins. The econometric analysis reveals that although large dams increase cropland productivity downstream, they have a negative effect on cropland within the vicinity. However, their existence can enhance the relatively small positive impact of local small dams. Although a cost-benefit analysis of irrigation benefits shows that small dams may be more viable than large ones, large dams can play a potentially important role within a system of both types of dams.
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agricultural productivity, canal network, catchment area, dam engineering, dam location, flood control, hydropower, irrigated area, irrigated investment, dam construction, large-scale infrastructure, river basins