1. S. N. Art’s, D. J. Malapani Commerce & B. N
S.N. Art’s, D.J.Malapani Commerce & B.N.Sarada Science College Sangamner Prof. Ravindra D. Gaikwad Department of Geography Phone No E – Mail Website - ravindragaikwad.yolasite.com

2. Rain Water Harvesting

4. Rainwater harvesting
Rainwater harvesting is the accumulation and deposition of rainwater for reuse before it reaches the aquifer. Uses include water for garden, water for livestock, water for irrigation, etc. In many places the water collected is just redirected to a deep pit with percolation. The harvested water can be used as drinking water as well as for storage and other purpose like irrigation.

5. What is Water Harvesting
In the state of Tamil Nadu, rainwater harvesting was made compulsory for every building to avoid ground water depletion.
In Rajasthan, rainwater harvesting has traditionally been practiced by the people of the Thar Desert.
At present, in Pune (in Maharashtra), rainwater harvesting is compulsory for any new society to be registered.

6. How much water can be harvested?
Consider your own building with a flat terrace area of 100 sq m. Assume the average annual rainfall in your area is approximately 600 mm (24 inches). In simple terms, this means that if the terrace floor is assumed to be impermeable, and all the rain that falls on it is retained without evaporation, then, in one year, there will be rainwater on the terrace floor to a height of 600 mm.
Area of plot = 100 sq. m. (120 square yards)
Height of the rainfall = 0.6 m (600 mm or 24 inches)
Volume of rainfall over the plot = Area of plot x height of rainfall
Assuming that only 60 per cent of the total rainfall is effectively harvested
Volume of water harvested = 36,000 liters (60,000 liters x 0.6)

11. Drought Events

12. Average water Use Per Person/ Day

13. Top Ten Countries Water Availability
Rank
Country
% Water 1
 Russia
4.21
Largest country in the world 2
Canada
8.93
Largest country in the Americas 3
China
1.41
Largest country situated entirely in Asia 4
U.S.A.
2.23 5
Brazil
0.65
The largest country in South America 6
Australia
0.76
The largest country in Oceania 7
 India
9.55 8
Argentina
1.57 9
Kazakhstan
0.92
Largest landlocked country 10
Algeria
Largest country in Africa.

14. Daly Water Use
Typical water use at home Bath A full tub is about 137 liters
Shower 7.6 liters per minute. Old shower heads use as much as 19 liters per minute.
Teeth brushing < 3.8 liters, especially if water is turned off while brushing.
Hands/face washing 3.8 liters
shaving 3.8 liters
Dishwasher 15 to 38 liters /load, depending of efficiency of dishwasher
Dishwashing by hand: 76 liters.
Clothes washer 95 liters. /load for newer washers. Older models use about 152 liters. per load.
Toilet flush 11.4 liters. Most all new toilets use 6 liters per flush, but many older toilets used about 15.2 liters.
Drinking of water 5 liters./ Day per person

15. Rainwater harvesting
As a guide to collection capacity, consider that each 1 mm. of rain = 1 liter of water per square meter of roof area, then allow 15% water wastage.

16. Sangamner College Case Study

17. Sangamner College Case Study
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18. THANK YOU
THANK YOU

19. Aquifer.