A dam is a structure across a river or waterway that controls water flow, providing advantages like power generation and flood control, but also has notable disadvantages such as dam failure and environmental impact. Dams disrupt ecosystems, degrade water quality, and can lead to loss of biodiversity as habitats are flooded. Additionally, while dams are perceived as clean energy sources, they can contribute to greenhouse gas emissions.

2. What is a Dam?
A Dam is a structure
built across a river,
stream, or waterway
to control the flow of
water.

3. Advantages of Big Dams

4. >>Power Generation

5. >>Crop Irrigation

6. >>Flood Control through Dams

7. >> Economy Developement

8. Disadvantages of Big Dams

9. >> Dam Failure

10. >> Sediment Capture

11. >> Fish Declination

12. >> People Migration

13. Environmental Impact of Dams

15. >> Disruption of Ecosystems
Dams alter natural water flow, which can disrupt local
ecosystems. Aquatic species that depend on specific water
conditions for spawning or migration may suffer. For
instance, fish species may be blocked from migrating to
breeding grounds, affecting biodiversity
>>Water Quality Degradation
The creation of reservoirs behind dams can lead to
stagnation, which reduces oxygen levels in the water. This can
lead to the growth of harmful algae blooms, water
contamination, and a decrease in water quality for
surrounding communities and wildlife.

16. >>Loss of Biodiversity
By flooding large areas of land to create reservoirs, dams
can destroy habitats for wildlife, including forests, wetlands,
and grasslands. This loss of habitat can lead to the decline or
extinction of some species.
>>Greenhouse Gas Emissions
While dams are generally seen as clean sources of energy,
large reservoirs in tropical regions can lead to the
decomposition of submerged organic material, releasing
methane, a potent greenhouse gas.

17. ZONATION OF LAKES

18. Any questions to
be asked?