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| Description: Dam = any obstruction placed in a river or stream to block the flow of water so that water can be stored in a reservoir To prevent floods, provide drinking water, allow irrigation, and generate electricity 45,000 large dams have been erected in more than 140 nations Only a few major rivers remain undammed In remote regions of Canada, Alaska, and Russia Major Benefits and drawbacks of dams Benefits: Power generation Emission reduction Crop irrigation Drinking water Flood control Shipping New recreational opportunities Drawbacks: Habitat alteration Fisheries declines Population displacement Sediment capture Disruption of flooding Risk of failure Lost recreational opportunities Picture Stats: Views: 159 Filesize: 213.22kB Height: 910 Width: 1179 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=35834 |