mention 3 disadvantages of MPRVP
Answers
Advantages :
(a) These are the main source of power generation.
(b) They provide us neat, pollution free and cheapest energy which is the backbone of industry and agriculture.
(c) These projects control the floods because water can be stored in them. These projects have converted many, ‘rivers of sorrows’ into ‘rivers of boon’.
(d) These projects are the main source of irrigation and also help in conserving soil.
Disadvantages :
(a) Due to the construction of dams, there are no adequate floods in the river.Because of this, the soil of the downstream region does not get nutrient rich silt.
(b) Dams also fragment rivers making it difficult for aquatic fauna to migrate for spawning, i.e., to produce eggs.
(c) It resulted in displacement of local communities. The local people often have to give up their land and livelihood and their meagre access and control over resources for the greater need of the nation.
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DISADVANATGES:
1. Dams are extremely expensive to build and must be built to a very high standard.
2. The high cost of dam construction means that they must operate for many decades to become profitable.
3. The flooding of large areas of land means that the natural environment is destroyed.
4. People living in villages and towns that are in the valley to be flooded, must move out. This means that they lose their farms and businesses. In some countries, people are forcibly removed so that hydro-power schemes can go ahead.
5. The building of large dams can cause serious geological damage. For example, the building of the Hoover Dam in the USA triggered a number of earth quakes and has depressed the earths surface at its location.
6. Although modern planning and design of dams is good, in the past old dams have been known to be breached (the dam gives under the weight of water in the lake). This has led to deaths and flooding.
7. Dams built blocking the progress of a river in one country usually means that the water supply from the same river in the following country is out of their control. This can lead to serious problems between neighbouring countries.
8. Building a large dam alters the natural water table level. For example, the building of the Aswan Dam in Egypt has altered the level of the water table. This is slowly leading to damage of many of its ancient monuments as salts and destructive minerals are deposited in the stone work from rising damp caused by the changing water table level.
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