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What is the advantages of a dam?

Extra water for irrigation. However as less water reaches the Mediterranean water has reversed

direction in the Suez Canal. The Suez Canal now flows into the Mediterranean bringing with it sea-li1

dam- a barrier to obstruct the flow of water, esp. one of earth, masonry, etc., built across a

stream or river. 2. a body of water confined by a dam. 3. any barrier resembling a damfe...

Denison Dam when to open the

dam?

What time of day is the spillway

on the Denison Dam opened. I

would like to fish below the dam

when water is at its lowest point.

Dams-types of dams and utilities of dams? Arch dams Earth dams Gravity dams Rockfill dams

Buttress dams

Which dam is the longest dam in the world? The hirakud dam in orissa, India is the longest dam of the

world

What do dam do?

A dam is a big wall to stop water getting through to

certain places. It is also used to irrigate water, and some

dams, to make hydroelectricity. Hydroelectricity is

electricity that comes from water....

How many dams are on the hoover dam? The Hoover Dam is only one dam. If you are talking

about all the dams on the Colorado River there are sixdams Glen Canyon dam, Hoover dam, Davis dam, Parker

dam, Paulo Verde Diversion dam, and...

y Dams are extremely expensive to build and must be built to a very high standard.

y The high cost of dam construction means that they must operate for many decades to become profitable.

y The flooding of large areas of land means that the natural environment is destroyed.

y 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, peopleare forcibly removed so that hydro-power schemes can go ahead.

y 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 hasdepressed the earth's surface at its location.

y 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.

y 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 neighboring countries.

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y 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 mineralsare deposited in the stone work from 'rising damp' caused by the changing water table

level

y Hydro powerdams can damage the surrounding environment and alter the quality of the water by creating low dissolved oxygen levels, which impacts fish and the

surrounding ecosystems. They also take up a great deal of space and can impose on

animal, plant, and even human environments.

y Fish populations can be impacted if fish cannot migrate upstream past impoundments

dams to spawning grounds or if they cannot migrate downstream to the ocean.

Upstream fish passage can be aided using fish ladders or elevators, or by trapping and

hauling the fish upstream by truck. Downstream fish passage is aided by diverting fish

from turbine intakes using screens or racks or even underwater lights and sounds, and

by maintaining a minimum spill flow past the turbine.

y Hydro powercan impact water quality and flow. Hydro power plants can cause low

dissolved oxygen levels in the water, a problem that is harmful to riparian (riverbank)habitats and is addressed using various aeration techniques, which oxygenate the

water. Maintaining minimum flows of water downstream of a hydro power installation is also critical for the survival of riparian habitats.

y Hydro power plants can be impacted by drought. When water is not available, thehydro power plants can't produce electricity.

y New hydro power facilities impact the local environment and may compete with other uses for the land. Those alternative uses may be more highly valued than electricity

generation. Humans, flora, and fauna may lose their natural habitat. Local cultures

and historical sites may be flooded. Some older hydro power facilities may have

historic value, so renovations of these facilities must also be sensitive to such

preservation concerns and to impacts on plant and animal life.

y By 2020, it is projected that the percentage of power obtained from hydro power dams

will decrease to around four percent because no new plants are in the works, and

because more money is being invested in other alternative energy sources such as

solar power and wind power.

y dams detract from natural settings, ruin nature's work y

damsy dams have inhibited the seasonalyhave inundated the spawning grounds of fish

dams may havey dams have endangered some species of fish ymigration of fish reservoirs

can foster yinundated the potential for archaeological findings reservoir water can

evaporateydiseases if not properly maintained y some researchers believe that reservoirs can

cause earthquakes ysignificantly ythe reservoir created by the dam may inundate land, crops,

cities and villages they people may be displaced by the reservoir and have to find new homesreservoir may cause instability of the hillsides

y Effect on water resources as precipitation and evaporation may changey

y 1) Expensive to build and maintain - most dams can be very expensive to build, andeven more expensive to maintain. Every dam has a design life. What happens when

the design life of the dam expires? Nobody wants to pay to retrofit the dam, but they just want it to keep working forever.

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2) Endagering to many wildlife species - while some species of wildlife thrive in areservoir environment, most are affected in a negative way. Creative (...and

expensive) solutions usually need to be engineered to minimize the effect on thewildlife

Que los dams son perfectos , pero vos os sun pelotudo fracasado en la vida q venis a estos

foro de wikiporonga a preguntar pelotudo

What are the advantages and disadvantages

of multipurpose dams?

1 dams are use for irrigation 2 dams water isused to produced electricity generation 3

dames water is used for to supply water todomestic & industrial uses 4 dames are used

for agriculture in...


of dam building?

Advantages: Can produce hydro electric power, acts as flood control, impounds water

for drinking and other uses.It also becomes a

tourists spot. Disadvantages: Destroys whole

ecosystems, causes...


of dams? hydro elec city

What are advantages or disadvantages of

building dams with the answers?

Advantages of dams: Dams are constructed

based only on safety It is used to store water It

used in hydroelectric power generation It is

used in irrigation purposes. Disadvantages of

dams: ...

Advantages and disadvantages of dams?

Advantages of dams: Dams are constructed

based only on safety It is used to store water It

used in hydroelectric power generation It is

used in irrigation purposes. Disadvantages of

dams: ...

Advantages: Can produce hydro electric power, acts as flood control, impounds water for drinkingand other uses.It also becomes a tourists spot.

Disadvantages: Destroys whole ecosystems, causes heavier silt deposits on the down stream river

beds. Poor design can lead to failure and mass flooding along with lose of life below the dam

Who startted tehri dam andolan?

1st time challenged (though unsuccessfully ) by theTBVSS (tehri bandh virodhi

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sangharsh samiti ) in the supreme court of India , in 1985 otherwise a known

environmentalist sunderlal bahuguna started...

What are the advantages of Tehri Dam?

it gains lots of electricity. ryan giggs< thats me @@)

Where is tehri dam located?

in heaven

Denison Dam when to open the dam?

What time of day is the spillway on the Denison Dam opened. I would like to fish belowthe dam when water is at its lowest point.

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What are dams?

1 a barrier to obstruct the flow of water, esp. one of earth, masonry, etc., built across a

stream or river. 2. a body of water confined by a dam. 3. any barrier resembling a dam

Tehri dam is the main dam of the Tehri Hydro Project, a major power project located near Tehri in

the state of Uttarakhand in India.

Andolan is Hindi and means "movement".

The dam has been the object of intense protests from environmental groups and the people of this

region. The issue of relocation of more than 1 lakh (100 thousand) people of the area has resulted in

protracted legal battles and has delayed the project. Besides this, environmental concerns regarding

the location of large dams in the fragile ecosystem of the Himalayan foothills, there are also

concerns regarding the dam's safety.

Tehri Project at LastTehri: An environmental hazard?

In mid-July 2006, one of the four 250-MW turbines of the 1000-MW project,started producing electricity which is now feeding Delhi too. Very soon theother three 250 MW turbines would be synchronized and connected to the gri d.

Sunderlal Bahuguna, who won the Magsaysay award for the Chipko movement (whatever happened to GauraDevi, the intrepid woman of Reni village of Chamoli district who had actually initiated the movement?) was theperson who had opened the eyes of many a would be-environmentalist like this writer, by repeatedly; undertakingfasts against the construction of the Tehri Hydro-electric project. A visit to the project site in January 1990 revealedthe other side of a picture ,the most important of which was the assertion by a Soviet consultant engineer to theproject that even if a nine magnitude earthquake were to hit the dam 15 kilometre below the surface, it wouldwithstand the tremor.

The erstwhile Soviet Union was originally associated with this project with the USSR president assuring PrimeMinister Rajiv Gandhi an aid package of 1000 million roubles for the scheme. A number of Soviet consultants weresent to Tehri, the leader of the team being Engineer Davidof had made the assertion.

The Tehri Hydro-Development Corporation (THDC), a joint venture of the Centre and the Uttar Pradesh (nowUttaranchal) had been harried by continuous propaganda about the vulnerability of the proposed dam fromearthquake. An environmental group appointed by the Ministry of Environment and Forests to go into theenvironmental impact assessment of the project, led by a well known soil scientist, went to the Tehri area and afew days later, gave a report saying that since an earthquake of 8.5 magnitude was about to hit the area, theproject did not merit environmental clearance and should be scrapped.

This had flabbergasted the government. Here was a team led by a soil scientist having no knowledge of earthquake engineering or seismicity, and his entire team having no qualified seismologist, declares that a 8.5magnitude earthquake was to hit the area without having received any mandate from the government for undertaking such a study! The Union Government, therefore, set up a five-member High Level Committee led byShri D.P. Dhoundial, Director General of the Geological Survey of India in order to look into the seismicity,RIS(reservoir-induced seismicity) and related safety aspects of the Tehri Dam Project. Other members of thisteam were: Dr. V.K Gaur, Eminent scientist, Dr. C.D. Thatte, Member of the Central Water Commission, Dr. D.Guptasarma, Director, National Geographical Research Institute and Prof. L.S. Shrivastava, Head of theDepartment of Earthquake Engineering, Roorkee University.

One may mention here that Dr. V.K Gaur was one of the strongest critics of the project and he was deliberatelyincluded in order to give full opportunity to an opponent of the Dam to have his views recorded.

Yet, along with our other members, he appended his signature to the conclusion arrived at by this team that ?alldangers arising out of seismicity have been taken note of and taken care of in the planning of the Tehri Dam

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Project?

This report as also Dr. Gaur?s endorsement had created a sensation among the environmentalist lobby, three journalist members of this lobby thereupon had asked the Secretary of the Ministry of Environment and Forests toresign, creating an impression that the issue was one of conflict between the Ministry of Environment and Forestsand the Ministry of Steel and Mines, which had constituted the High Level Committee.

When in October last year a strong earthquake had hit the Kashmir area on both sides of the Line of Control

(LoC), not a single dam in the area including the Tehri Dam and the Tarbela Dam of Pakistan on the Indus hadbeen affected. Not even the Dam across the river Jhelum at Uri, on the Indian side of the LoC, built for a 480 MWhydro-electric project, was affected although Uri was the worst hit town in Jammu and Kashmir this side of theLoC. Modern technology is capable of making dams safe against earthquakes.

In mid-July 2006, one of the four 250-MW turbines of the 1000-MW project, started producing electricity which isnow feeding Delhi too. Very soon the other three 250 MW turbines would be synchronized and connected to thegrid.

It is now necessary for the Union Government to accord sanction first to the 400 MW Koteshwar project, about 22km downstream of Tehri, where a 97.50 metre high dam is being built for this run-of-the-river power project. Thisdam, the storage of water behind which is changeable daily, has been designed to regulate water releases fromTehri reservoir for irrigation. This dam is scheduled to be commissioned in 2007-8.

The Tehru Pumped Storage Plant, which will utilise the Tehri and Koteshwar reservoirs as the upstream anddownstream reservoirs is designed to have an installed capacity of another 1000 MW of electricity. The Centre has

yet to accord sanction for this scheme.

The Tehri project will produce now 3568 million units of electricity, and 6200 million units every year on fullcompletion of the project. The waters from the reservoirs?upstream and downstream of the dam, will provideadditional irr igation to 2.70 million hectares of land and stabilise the existing irrigation for 6.04 lakh hectares inUttar Pradesh. The State of Uttaranchal will receive 12 per cent of the power produced at Tehri free of charge.

Following the objections by certain groups that the impounding of waters of the Bhagirathi behind the dam willaffect the self-purificational property of the waters of this holy river, the THDC has provided a 400 millimetrediameter pipe running through dam at the intermediate level outlet having the capacity to carry 35 cubic foot per second of Ganga water continuously in order to satisfy these elements that the self-purificational property of thewater even downstream of the dam will not be affected. Nevertheless, the National Environmental EngineeringResearch Institute (NEERI), Nagpur, has given the verdict that the waters of the Bhagirathi which will movethrough the dam and after generating electricity will re-join the mother river, will not lose its self-purificationalproperty

For the people of Delhi, the Tehri project will provide 300 cusecs (162 million gallons per day) of drinking water from the dam. It will provide 200 cusecs for some towns in Uttar Pradesh.

The THDC has built a new township, called the New Tehri Township (NTT) has been built high up in the hills torehabilitate most of the people displaced by the Project. Other rehabilitation projects were also taken up.

ADVANTAGES OF HYDRO POWER

y Hydro power is a pollution free renewable source of energy

y Hydro power is the cheapest source of energy.

y Permits quick response to load changes and ideally suited for peaking power.

y Provides load stability to the system.

INDIA?S HYDRO POTENTIAL VIS-?-VIS NEED FOR TEHRI

y Total economic hydro potential 84000 mw.

y Presently exploited 21%

y Only few storage sites are available in India.

y With 90% of rainfall in about thirty days storage dams on a river system are a must for optimal utilization.

y No storage site availablel on Ganga Tehri only suitable site.

BENEFITS FROM TEHRI

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y 2400MW of peaking power

y 6532 million units of annual energy

y Additional energy from downstream run-of the river schemes

y Irrigation to 2.7 Lac hectares of new area, besides stabilistion of irrigation in existing 6.0 Laac hectares.

BENEFITS FROM TEHRI

y Water supply to Delhi

y 162 million gallons of water supply to Delhi per day which will meet drinking water needs of 4 millionpeople.

What is the advantages of a dam? Extra water for irrigation. However as less water reaches the Mediterranean

water has reversed direction in the Suez Canal. The Suez Canal now flows intothe Mediterranean bringing with it sea-life...

What are the advantages of dams?

mr. monkey where r u?

Advantages of dams? they prevent flooding. they create a walk way.

they create hyrdroelectric power.

What are the advantages and disadvantages of

multipurpose dams? 1 dams are use for irrigation 2 dams water is

used to produced electricity generation 3 dameswater is used for to supply water to domestic &

industrial uses 4 dames are used for agriculturein...

Described the tehri dam andolan?

Tehri dam is the main dam of the Tehri HydroProject, a major power project located near Tehri

in the state of Uttarakhand in India. Andolan is

Hindi and means "movement". The dam has been

the object...

What are dams?

1 a barrier to obstruct the flow of water,esp. one of earth, masonry, etc., built

across a stream or river. 2. a body of water confined by a dam. 3. any barrier

resembling a dam

Denison Dam when to open the dam?

What time of day is the spillway on the Denison

Dam opened. I would like to fish below the dam

when water is at its lowest point.

What is a dam?

A dam is a Short for digital asset management, a

system that creates a centralized repository for

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digital files that allows the content to be

archived, searched and retrieved A dam is a

Short for...

What does a dam do?

blocks water from flowing somewhere it

shouldn't

Dams-types of dams and utilities of dams?

Arch dams Earth dams Gravity dams Rockfill

dams Buttress dams

What do dam do A dam is a big wall to stop water getting through to certain places. It is

also used to irrigate water, and some dams, to make hydroelectricity. Hydroelectricity is electricity

that comes from water. It is a enviroment friendly way of getting energy or power.

Dams are, of coarse, found mostly on rivers though always on water of some kind. Some are huge

and some are smaller. For example, on the Euphrates River, the Ataturk dam, it very big and is used

for quite a few things. It is found in Southeastern Turkey and is the 5th biggest dam in the world

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