how does building of large dams cause environmental problems
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The alteration of a river's flow and sediment transport downstream of adam often causes the greatest sustained environmental impacts. ... Riverbeds downstream of dams aretypically eroded by several meters within the decade of first closing adam; the damage can extend for tens or even hundreds of kilometers below a dam.
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Most dams are built to control flood hazards, to store waterfor irrigation or other uses, or to produce electricity. Along with these benefits come environmental costs including riparian habitat loss, water loss through evaporation and seepage , erosion , and declining water quality .
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