3. • This is the act by man to help the
rain water to percolate in to the
earth and replenish the water table
• Water scarcity in the field of
agriculture and water for agricultural
purposes can be solved by these
method.
• In India rain water harvesting started
in olden times itself
5. • This method came due to the
vagaries of monsoon
• People inhabited in the Thar desert
in 4500 BC before Indus valley
civilization
• During the Harappa civilization first
wells were dug
• In mauryan age rain water
harvesting was done in large scale
6.
7. • One of the first rock-cut tank can be seen
near the statue of Buddha in Sanchi
• It was during the time of Chandragupta
Mauryan the reservoir built first time
• During the time of Asoka also rain water
harvesting done in large scale
• During the time of king of kalinga ,
Kharavel canal began to built for
irrigation
8.
9. • During the middle age projects were
carried out for the distribution of water
in the cities
• The possibility of rain water harvesting
is a major siting factor for the
development of Jodhpur ,this city built
with vast rain water harvesting fecilities
• Delhi was shifted from slopes of aravally
range to the banks of yamuna due to
the availability of water there
10. Need for rain water harvesting
• To prevent depletion of
underground water and replenish
the water table
• To reduce the rate of surface run off
• To prevent soil erosion
• To increase the awareness of
conserving water
11.
12. Importance of rain water harvesting
• Man has used up 50% of the water on
the planet
• More than 100 crore people do not
have drinking water
• More than 300 crore people do not
have water for their basic needs
• Increase in population decreases per
capita availability of water
13. More than 100 ccrroorree ppeeooppllee ddoo nnoott hhaavvee
ddrriinnkkiinngg wwaatteerr
14.
15.
16. Ways of rainwater harvesting
• Surface run off harvesting
• Roof top rainwater harvesting
