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W hy are rivers altered? Flood control To protect towns, cities and farmland from flooding. Water supply Diverting water for drinking and irrigation. Hydroelectric power Building dams to generate electricity. Navigation Making rivers easier for boats and ships to travel along. Agriculture Redirecting or straightening rivers to create more farmland. Urban development Altering river courses to make space for new buildings and infrastructure. Recreation Creating lakes for activities, like boating and fishing. Erosion control Stabilising riverbanks to protect land and properties. Restoring our Rivers Science Story