Dam : Benefits and Problems
Benefits
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.
River valley projects with big dams have usually been considered to play a key role in the development process due to their multiple uses.
The big dams effects are sometimes disastrous.
Their impacts are also too many due to which very often the big dams become a subject of controversy.
* Breeding of vectors and spread of water borne diseases like malaria
* Loss of forests, flora and fauna
River valley projects with big dams have usually been considered to play a key role in the development process due to their multiple uses.
Problems
The big dams effects are sometimes disastrous.
Their impacts are also too many due to which very often the big dams become a subject of controversy.
Here the following problems arises:
* Breeding of vectors and spread of water borne diseases like malaria
* Loss of forests, flora and fauna
* Changes in fisheries and the spawning grounds
* Sedimentation of reservoirs
* Loss of non forest
* Breeding of vectors and spread of water borne diseases like malaria
* Growth of aquatic weeds
* Water logging problems
* Problem of salinity due to over irrigation
* Reduced water flow and slit deposition in river
* Loss of land fertility along the river since the sediments carrying nutrients get
in the reservoir.
* The displacement of tribal people.
* Loss of forests, flora and fauna
Q. What are minerals?Q.What are the uses and exploitations of minerals?
MINERAL Resource
Q. What are minerals?Q.What are the uses and exploitations of minerals?
Q.Some major minerals of India:
1.Energy generating minerals and,
2.Other commercial use minerals .
Q.Environment impact of mineral extraction and uses?
1.Ecological impact: Deforestation and vegetation, loss of Flora & Fauna and ecosystem degradation
2.Positive sociology-economic impact: Employment infrastructure facilities for economic gains.
3.Environmental pollution: Air, water, noise.
4.Physical impacts: land subsidence, landscape destruction & soil erosion.
5.Negative sociology-economic impacts: encroachment, evacuation, resettlement,rehabilitation issues.
6.Occupation health impacts: health hazards due to long term exposure to hazardous chemical accidents
FOOD RESOURCES
* Salinity, water logging (air holes close then soil damages)
* Salinity is inversely proportional to fertility of soil
Environmental Impact related to food resources
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