Renewable energy is the energy which is generated from natural sources i.e. sun, wind, rain, tides and can be generated again and again as and when required. They are available in plenty and by far most the cleanest sources of energy available on this planet.
source : 1
Three Gorges Dam, China (30°44'18" North, 111°16'27" East), crosses theYangtze River at Sandouping, Yichang, Hubei province, China. The dam’s name refers to the majestic limestone cliffs of the Qutang, Wu, and Xiling gorges, which stretch for about 200 kilometers (124 miles) from Fengjie, in Sichun province, to Yichang, in Hubei province, in China's heartland. The Yangtze is the longest river in Asia and the third longest in the world. sources :1,2
In June 2003, nine years after construction began, the state-owned China Yangtze Three Gorges Development Corporation (CTGPC) filled the reservoir with 445 feet (135 meters) of water, the first of three increments in achieving the eventual depth of 575 feet (175 meters). The result is a narrow lake 410 miles (660 kilometers) long—60 miles (97 kilometers) longer than Lake Superior—and 3,600 feet (1,100 meters) wide, twice the width of the natural river channel.
Take some time out to watch this interesting video on the 'dam' projects of the world and their impact, narrated by Nigerian environmental activist Nnimmo Bassey
Duration: 12 min
Lesotho Highlands Water Project (LHWP) is the largest bi-national infrastructure project between Lesotho and South Africa. It involves the construction of an intricate network of tunnels and dams to divert water from the mountains of Lesotho to South Africa. It will provide water for South Africa and money and hydroelectricity for Lesotho.
Purpose of the Lesotho Highlands Water Project
The Objectives of the Project are :
i) To provide revenue to Lesotho by transferring water from the catchment of the Senqu/Orange river in Lesotho to meet the growing demand for water in the RSA's major industrial and population centres
ii) To generate hydro-electric power for Lesotho in conjunction with the water water transfer
iii) To promote the general development of the remote and underdeveloped mountain regions of Lesotho, while ensuring that of Lesotho, while ensuring that comprehensive are taken to counteract any adverse effects which the Project might have on the local population and their environment
iv) To provide the opportunity to undertake ancillary developments such as the the provision of water for irrigation and potable water supply
'Water for Life Decade ' 2005 - 2015
Water scarcity already affects every continent. Around 1.2 billion people, or almost one-fifth of the world's population, live in areas of physical scarcity, and 500 million people are approaching this situation. Another 1.6 billion people, or almost one quarter of the world's population, face economic water shortage (where countries lack the necessary infrastructure to take water from rivers and aquifers).
Non-Renewable energy is the energy which is taken from the sources that are available on the earth in limited quantity and will vanish fifty-sixty years from now.
source : 1
The most important effect that the construction of the Three Gorges Dam has had on Chinese society has been the displacement of millions of people from the Yangtze river region.
Factors Affecting the Selection of Site for Dams
1) Good topographical location along the path of river: The best location along the path of the river is river canyon or at the location where there is narrowing of the river. If the aim is to store maximum amount of water, then the volume of basin above dam should be calculated so that sufficient quantity of water can be stored in it. The perfect site is one where there is wide and flat valley.
2) Right geological structure: The rock structure on which the dam will be constructed should be strong enough to sustain the weight of dam and water stored in the dam. The rock structure should be able to sustain all the visible and invisible forces. The rock structure should be stable and there should be least occurrence of the earthquakes in the region. The rock structure should not allow the seepage of water and it should be waterproof.
3) Sufficient water is available: The flow of water where dam is constructed should be sufficient enough to fill the dam. There is lots of loss of water from dam due to evaporation, the flow of river water should be able accommodate this loss of water without affecting the production of electricity from the hydroelectric power plant.
Wind consistency is probably the biggest factor in choosing where to build a wind farm. It doesn’t matter if the wind blows at 100 MPH if the gust only lasts a second
Ease of Construction
The winds off the coasts are the best wind conditions on earth for power generation. So why are so few wind turbines water bound? It’s a simple matter of economics
Distance to People
There are actually two different considerations here: distance to those who need power and distance from those who will be upset by the noise.
Locating power plants that are long distances from people is generally a bad idea. In order to keep a high-efficiency link with the rest of the power grid, an expensive array of inverters and transformers is needed...
Why is Water So Important?
Learn about the importance of water and how it effects so many aspects of our lives. Click on these links to find out more about...
Water scarcity is either the lack of enough water (quantity) or lack of access to safe water (quality).
It's hard for most of us to imagine that clean, safe water is not something that can be taken for granted. But, in the developing world, finding a reliable source of safe water is often time consuming and expensive. This is known as economic scarcity. Water can be found...it simply requires more resources to do it.
In other areas, the lack of water is a more profound problem. There simply isn't enough. That is known as physical scarcity.
Did you know that ?
- Almost one fifth of the world's population (about 1.2 billion people) live in areas where the water is physically scarce. One quarter of the global population also live in developing countries that face water shortages due to a lack of infrastructure to fetch water from rivers and aquifers.
- Water scarcity encourages people to store water in their homes. This can increase the risk of household water contamination and provide breeding grounds for mosquitoes - which are carriers of dengue fever, malaria and other diseases.
FIND more such facts by clicking image below