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-The dams are very expensive to build
-However , many dams are also used for flood control or irrigation , so building costs can be shared .
-Building a large dam will flood a very large area upstream , causing problems for animals that used to live there
-Finding a suitable site can be difficult - the impact on residents and the environment may be unacceptable .
-Water quality and quantity downstrea can be affected , which can have an impact on plant life .
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