Post on 28-Nov-2015
description
Subject :- E.V.S
Name of Teacher :- Mrs. U. Kawdikar
Submitted by :- Vaibhavraj Ramkar
Class :-V B
School :- K.V. No. 1 Gwalior
INDIA’S BIGGEST AND LARGEST DAMS
After independence we have made lots of progress in dams and water reservoirs, Now India is one of the world’s most prolific dam-builders. Around 4300 large dams already constructed and many more in the pipeline, Almost half of which are more than twenty years old. These dams are major attraction of tourists from all over India. Some facts about the Indian dams are: Tehri dam is the eighth highest dam in the world. The Idukki dam is the first Indian arch dam build across the Periyar river in Kerala and the largest arch dam in Asia. The Grand Anicut of Kallanai, located on Holy Cavery River in Tamil Nadu, is the oldest dam in the world.
TEHRI DAM- UTTARANCHAL
BHAKRA NANGAL DAM - HIMACHAL
HIRAKUND DAM-ORRISA
SARDAR SAROVAR DAM - GUJRAT
LOCATION DAM IN INDIA
ADVANTAGE OF DAM
1. Once a dam is constructed, electricity can be produced at a constant rate.
2. If electricity is not needed, the sluice gates can be shut, stopping electricity generation. The water can be saved for use another time when electricity demand is high.
3. Dams are designed to last many decades and so can contribute to the generation of electricity for many years / decades.
4. The lake that forms behind the dam can be used for water sports and leisure / pleasure activities. Often large dams become tourist attractions in their own right.
5. The lake's water can be used for irrigation purposes.
6. The build up of water in the lake means that energy can be stored until needed, when the water is released to produce electricity.
DISADVANTAGE OF DAM
Dams are extremely expensive to build and must be built to a very high standard.
2. The high cost of dam construction means that they must operate for many decades to become profitable.
3. The flooding of large areas of land means that the natural environment is destroyed.
4. 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.
5. 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.
THANKYOU