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Dams are expensive and the projected financial costs are often inaccurate. The benefits are often overestimated, driven by the incentives of politicians, developers, contractors, consultants, and banks to implement new projects. And since, most of the world's dams are now being built in developing countries, it is even more important that a project makes economic sense.
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DAMS block fish migration and keep sediments from washing downstream
dams are extremely expensive to build and must be built to very high standard
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