Dams are extremely expensive to build and must be built to a very high standard.
The high cost of dam construction means that they must operate for many decades to become profitable.
The flooding of large areas of land means that the natural environment is destroyed.
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.
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 earth's surface at its location.
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.
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.
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.
They stop your mom from making babies with your dad !!
Well, a lot of it gets flooded. The surrounding areas usually benefit.
They Collect Silt
what is the positive and nagetive effects
what are the positive and negative effects of globalization to hopitality industry?
what are the positive and negative affect of a sinkhole
negative effects
Negative effects are can cause flooding if broken
positive
There were positive effects as well as negative effects
The desert had many positive and negative effects of the desert.
Positive for the colonists and negative for those colonized.
Dams Can give negative effects to the environment
what are positive effects of bio fuel
Positive: Environmental Negative: loss of soverignty