What is a good reason to build a dam on a river?

Dams are important because they provide water for domestic, industry and irrigation purposes. Dams often also provide hydroelectric power production and river navigation.

Is building a dam good or bad?

Dams can create a reservoir to hold water, protect areas from floods, or generate clean electricity. All good, right? But wait, there’s more: A dam also physically blocks migrating fish and changes the overall biology of the life in the river by changing the natural water flow.

Why we should not build big dams?

Big dams even cause earthquakes (because of the weight of water in reservoirs), release greenhouse gases (because of the rotting of flooded vegetation), destroy marine fisheries (because they disrupt river-borne flows of freshwater and nutrients into oceans) and lead to coastal erosion (because the sediments that …

Should we build big dams give arguments in Favour of your answer?

In Favor :- They provide water for irrigation, prevents of floods and generates electricity. Large dams have the potential to save the country from critical food shortages. We cannot blame dams for improper rehabilitation. Dams save ground water from over-exploitation.

Why are dams bad for rivers?

Dams change the way rivers function. They can trap sediment, burying rock riverbeds where fish spawn. Gravel, logs, and other important food and habitat features can also become trapped behind dams. This negatively affects the creation and maintenance of more complex habitat (e.g., riffles, pools) downstream.

What are cons about dams?

List of the Disadvantages of Dams

• Dams can displace a significant number of people.
• Reservoirs behind a dam can lead to higher greenhouse gas emissions.
• This technology disrupts local ecosystems.
• Some river sediment is beneficial.
• Dams create a flooding risk if they experience a failure.

Why do we need to remove dams?

By building dams, we choked the life out of rivers, thereby causing much damage to people, local economies, and the species that needed healthy rivers to survive. We are now undoing the damage we caused by starting to remove dams.

What are the disadvantages of building a dam?

Dams are problem creators, not problem solvers. As explained, the dams will bring more problems than they will solve. Hydropower dams flood large areas, force people to relocate, threaten freshwater biodiversity, disrupt subsistence fisheries, and leave rivers dry – substantially affecting the ecosystem.

Will the world’s new dams invite more problems?

Invite more problems. According to a new study done by researchers in Europe, the 3,700 new dams under construction or planned for construction around the world will not meet the electricity demands of the developing countries where the dams are planned.

What are the benefits of floods and dams?

Rushing floodwaters replenish the nutrients in the soil in water, which is beneficial to all plant and animal life in rivers and other waterways. When water is diverted due to a dam, it can greatly disrupt the delicate natural ecosystem.