2. WATER
• Earth is also known as a watery planet
• About 71% of total surface area of the Earth is
covered with water
• Replenished by the process of water cycle
• Multi-purpose projects have been developed
to regulate the supply of water
3. GEOGRAPHICAL FACTORS FAVOURING
IRRIGATION
Relief of the land
Type of the crops
Type and fertility f soils
N. plains is one of the most fertile lands in India
The amount and distribution of rainfall
Deep clay acts as reservoir for rain water
4. MEANS OF IRRIGATION
• Wells- ordinary well is about 5-10 m deep.
• Tube wells- deep bore from which water is drawn
out with the help of pump run by electricity; depth
of about 15m or more.
• Tanks- common where land is uneven and rocky
• Canals- areas of low level relief, deep fertile soils,
perennial source of water and extensive command
area
5. MANAGING OUR WATER RESOURCES
• Control floods
• Store water for irrigation
• Generate hydroelectricity
• Encourage navigation
• Rainwater harvesting
6. IMPORTANT MULTI-PURPOSE
PROJECTS
• Damodar valley project( Bihar and W.B.)
• Bhakra nangal dam(Punjab, Haryana, Rajasthan)
• Hirakud project( Mahanadi, Orissa)
• Beas project( Punjab)
• Kosi project(Bihar)
• Rihand valley project( U.P.)
• Narmada valley project
• Chambal valley project(Rajasthan and M.P.)
• Nagarjuna sagar project(Krishna, Andhra pradesh)
