what are the benefits and problems of big dams?
12758
The dams have tremendous potential for economic upliftment and growth. They can help in checking floods and famines, generate electricity and educe water and power shortage, provide irrigation water to lower areas, provide drinking water in remote areas and promote navigation, fishery etc.
96028
['It does not provide good soil access. ... ', 'It changes the structure of our atmosphere. ... ', 'It can change weather patterns. ... ', 'It provides a finite revenue boost. ... ', 'It contributes to extinction-level events. ... ', 'It can cause more frequent flooding. ... ', 'It is a finite resource.']
283432
Dams have broad walls at the base to withstand the high pressure exerted by the water. The pressure in liquids increases with the increase in the depth of water.
485038
Dams block the migration of fish, deplete rivers of oxygen, and interfere with the biological triggers that guide fish. They also reduce the ability of rivers to clean themselves.
659487
Dams. A dam is a structure built across a stream or river to hold water back. Dams can be used to store water, control flooding, and generate electricity.
830997
['Availability of Earth Materials. Earth is readily available in most parts of the world close to possible dam sites. ... ', 'Easy Handling of Earth. Earth can be excavated by hand, transported in baskets and compacted with cattles walking over it. ... ', 'Foundation Condition. ... ', 'Cost of Construction.']
195701
['Renewable. Hydroelectric energy is renewable. ... ', 'Green. Generating electricity with hydro energy is not polluting itself. ... ', 'Reliable. Hydroelectricity is very reliable energy. ... ', 'Flexible. ... ', 'Safe. ... ', 'Environmental Consequences. ... ', 'Expensive. ... ', 'Droughts.']
1141655
1) Multi-purpose projects require a large area to be set-up. 2) They produce problems in the natural water flow. 3)When water is released under great pressure it floods the entire area. 4)The collected water in dams solidifies the soil and increases the water level.
856324
There are currently in excess of 70,000 large dams worldwide. With the continuing construction of new dams, more than 90 per cent of the world's rivers will be fragmented by at least one dam within the next 15 years.
482102
['Environmental Consequences. The environmental consequences of hydropower are related to interventions in nature due to damming of water, changed water flow and the construction of roads and power lines. ... ', 'Expensive. ... ', 'Droughts. ... ', 'Limited Reservoirs.']
88254
Hydropower: Economic Impact. The greatest benefit from the USACE hydropower program is the abundant low-cost energy the projects contribute to electric power grids. Because hydroelectric powerplants burn no fuel, operating costs are low and are immune to rising fossil fuel prices.
1041060
Dam Information A dam is defined as a barrier or structure across a stream, river or waterway to confine and then control the flow of water. Dams vary in size from small earth embankments, often for farm use, to high massive concrete structures generally used for water supply, hydropower and irrigation.
1107613
Dams are important because they provide water for domestic, industry and irrigation purposes. Dams often also provide hydroelectric power production and river navigation. ... Dams and their reservoirs provide recreation areas for fishing and boating. They help people by reducing or preventing floods.
246746
Dams are built to control and store water. Dams are made from earth, stacked rock or concrete, and are usually constructed across rivers to store water in the reservoir that is formed behind the dam as a result of the river being blocked.
798185
Hydropower offers advantages over other energy sources but faces unique environmental challenges. Hydropower is a fueled by water, so it's a clean fuel source. Hydropower doesn't pollute the air like power plants that burn fossil fuels, such as coal or natural gas.
1310774
The main objective for the dam is to supply water for the largest hydroelectric plant in the world and to help control the devastating floods that plague the lowlands downstream from the dam. The epic scale of the dam project is matched by the level of controversy it continues to generate.
640902
The collective benefits of Aswan High Dam (AHD) are increasing the Egyptian water resource, controlling and regulating floods, protecting Egypt from potential frequent droughts, increasing agriculture productivity, and completely regulating the river water.