Why do environmentalists oppose the construction of large dams?

Answer: Large dams have provoked opposition for numerous social, environmental, economic and safety reasons. The main reason for opposition worldwide are the huge numbers of people evicted from their lands and homes to make way for reservoirs.

Why is there an opposition to building of dams?

Dams are opposed due to various reasons: 1) It requires huge acres of land in order to construct it. 2) it takes lots of years to construct it. 4) Low lying land areas will be submerged under the dam and the vegetation rots leading to spread of diseases.

How does dam construction affect the environment?

The water regime may change as a result of destruction of nature, unex- pected floods may occur and consequently vegetation and natural struc- tures in the riverbanks can be damaged. 11. Some increase in earthquakes may occur because of filling of big dam reser- voirs.

Why has construction of dams caused dispute and criticism?

Water in reservoirs, especially in water-storage dams, becomes silted with vegetation and matter washed off land upstream. As that rots, it emits carbon dioxide and methane, contributing to the greenhouse effect.

Which environmental problem is associated with the construction of high rise dams?

Explanation: One of the first problems with dams is the erosion of land. Dams hold back the sediment load normally found in a river flow, depriving the downstream of this. In order to make up for the sediments, the downstream water erodes its channels and banks.

Why is it not possible to construct a large dam in Medak district?

Answer Expert Verified This district is located at the elevation of 1450 Metres. Building a dam on such a height is too risky. There will huge risks of landslides or earthquakes. The government also is not in favour of any construction in Medak.

How does construction of dams positively affect natural resources?

It turns habitable land uninhabitable.It restores trees to areas where they once grew. It restores trees to areas where they once grew.

How does construction of dams affect the water cycle?

Dams change the way rivers function. They can trap sediment, burying rock riverbeds where fish spawn. Dams that divert water for power and other uses also remove water needed for healthy in-stream ecosystems. Peaking power operations can cause dramatic changes in reservoir water levels.

What are the problems associated with construction of high rise dam over the river?

(iii) Construction of dams have resulted in problems like excessive sedimentation and salinity, waterlogging, sudden floods, soil erosion, large scale deforestation, extinction of species, health hazards, displacement of local communities and loss of livelihood of tribal communities.

What are three main problems from dams Class 10?

Answer

• social problems as they displace a large number of farmers and tribals.
• economic problems as they consume a huge amount of public money without proportionate benefit.
• environmental problem as they cause deforestation and loss of biological diversity.