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प्रश्न
State the advantages of constructing dams across the rivers.
उत्तर
Following are the advantages of constructing dams across the rivers:
- They can store excess water, thereby preventing floods.
- Water from the dams can be used for the irrigation of crops via a network of canals.
- After a suitable treatment, people of towns and cities get dam water through pipelines, for usage.
- Water falling from the dams is used to generate electricity in hydropower plants.
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संबंधित प्रश्न
What is watershed management system ?
Name the river with which the Sardar Sarovar Dam is associated.
Describe briefly the 'khadin' system of rainwater harvesting practised in Rajasthan.
The river water is said to be polluted with acidic wastes if the pH of river water is :
(a) zero
(b) above 7
(c) below 7
(d) exactly 7
List four advantages of water stored in the ground.
Why is it important to conserve water?
Groundwater will not be depleted due to ______
In our country, there are attempts to increase the height of several existing dams like Tehri and Almati, dams across Narmada. Choose the correct statements among the following that are a consequence of raising the height of dams.
(i) Terrestrial flora and fauna of the area are destroyed completely.
(ii) Dislocation of people and domestic animals living in the area.
(iii) Valuable agricultural land may be permanently lost.
(iv) It will generate permanent employment for people.
Suggest a few useful ways of utilising waste water.
Match the following:
| Secondary Treatment | Disinfection |
| Grey water | Floatation |
| Primary Treatment | Reusable wastewater |
| Tertiary Treatment | Sedimentation |
