The document discusses the purposes of building dams. Dams can generate hydroelectric power, provide irrigation water for agriculture, and supply drinking water. Dams also help control flooding by regulating water levels and flow. The largest dams in the world are discussed, including the Three Gorges Dam in China, Nurek Dam in Tajikistan, and Grande Dixence Dam in Switzerland. While dams provide benefits like power, irrigation, and flood control, they are also very expensive to build and can displace people and damage animal habitats.

1. The Purposes of Building a Dam
• Presenters
1. Mohammad Reza Taheri
2. Waheedullah Mohammadkhail

2.  Introduction
_ Brief Information of dam
 The world largest dams
 Advantage and disadvantage of dam
 Hydro-Electric Power
 Irrigation
_Drinking water
_Farming
 Control Of Flooding
 Conclusion
Index

3.  A human-made barrier structure
What is a dam

4.  The Three Gorges ( China ) H.E.P & F.C
 Nurek Dam ( Tajikistan ) H.E.P
 The Grande Dixence Dam (Switzerland) H.E.P
The World Largest Dams

5. The Three Gorges ( China ) H.E.P & F.C

6. Nurek Dam ( Tajikistan ) H.E.P

7. The Grande Dixence Dam (Switzerland) H.E.P

8. Advantage of dam
* Prevent flooding in lower course
* Produce hydroelectric power for economic and industrial
* Better for irrigation
* Store water from rain
* Improve water transport
* Attract tourist

9.  It is very expensive
 Many people have to move
 The living environment of animals and fishes will be
destroyed in lower course
Dis advantage of dam

10.  Structure
Hydro-Electric Power

11.  Irrigation is the artificial application of water to the land or soil
 Drinking water
 Irrigation the farms
Irrigation

12. is water safe enough to be consumed by humans or used with
low risk of immediate .
Drinking Water or potable

13. Irrigation The Farms

14.  the act or technique of controlling river flow with
dams, dikes, artificial channels, etc
Control Of Flooding

15. Big flood control dams in the world
The Three Gorge Dam(China)

16. * The Largest Dams in The World
*Kinds Of Dam
Conclusion

17.  By regarding
Mohammad Reza Taheri
Waheedullah Mohammadkhail
The End

18. Question