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Is Small Better? A Comparison of the Effect of Large and Small Dams on Cropland Productivity in South Africa

AGRICULTURAL PRODUCTION AGRICULTURAL PRODUCTIVITY AGRICULTURAL WATER BASIN BASIN BOUNDARIES BASIN LEVEL CANAL CANAL NETWORK CAPACITY BUILDING CATCHMENT CATCHMENT AREA CATCHMENT AREAS CATCHMENTS CLIMATE CHANGE CONSTRUCTION COSTS COVERING CUBIC METERS DAM BUILDING DAM CLASSIFICATION DAM DEVELOPMENT DAM ENGINEERING DAM FAILURE DAM HEIGHT DAM LOCATION DAM SAFETY DAM WALL DRAINAGE DRAINAGE BASIN EARLY WARNING SYSTEM EARTH DAMS EARTHEN DAMS EMBANKMENT EMBANKMENT DAMS ENVIRONMENTAL COSTS ENVIRONMENTAL DEGRADATION FILL DAMS FILL EMBANKMENT FLOOD CONTROL FLOODS FLOW OF WATER GRAVITY GRAVITY DAMS HAZARD POTENTIAL HYDRAULIC CONDUCTIVITY HYDROLOGICAL CYCLE HYDROLOGICAL MODEL HYDROLOGY HYDROPOWER HYDROPOWER PRODUCTION IMPACT OF DAM IMPACT OF DAMS INTEGRATED WATER RESOURCES MANAGEMENT INTERNATIONAL WATER IRRIGATED AREA IRRIGATION CANAL IRRIGATION INVESTMENT IRRIGATION WATER LAKE LARGE DAM LARGE DAM CONSTRUCTION LARGE DAMS LARGE IRRIGATION LARGE-SCALE INFRASTRUCTURE LARGER DAM LOCAL RIVER LOCALITY MANAGEMENT PRACTICES NATURAL RESOURCES RAIN RAINFALL RAINWATER RAINWATER HARVESTING REMOTE SENSING RESERVOIR RESERVOIR CAPACITY RIPARIAN RIPARIAN RIGHTS RIVER RIVER BASIN RIVER BASIN AREA RIVER BASIN MANAGEMENT RIVER BASIN SCALE RIVER BASINS RIVER FLOW RIVER LENGTH RIVER NETWORK RIVERS RUNOFF SALINITY SAND DAM SAND DAMS SEEPAGE SMALL DAM SMALL DAMS SMALLER DAMS STORAGE CAPACITY STREAM STREAM FLOW STREAMFLOW SURFACE AREA TREE COVER UPSTREAM DAM UPSTREAM DAMS USE OF DAMS WATER HARVESTING WATER LOGGING WATER RESOURCES WATER RIGHTS WATER STORAGE WATER SUPPLY WATER SUPPLY MANAGEMENT WATER TRANSFER WATER USE
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World Bank, Washington, DC
Africa | South Africa
2013-10-01T21:13:39Z | 2013-10-01T21:13:39Z | 2013-08

This study estimates and compares the effects of small and large irrigation dams on cropland productivity in South Africa. To this end, a panel data set of South African river basins is constructed. 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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