RAINWATER HARVESTING

1. Presented By:
Mohammed Tayeeb

2. Reasons for shortage of water
 Population increase
 Industrialization
 Urbanization
 Decrease in surface of lakes, tanks.
 Deforestration

3. What is rainwater harvesting
 It is the direct collection
of rainwater.
 Rainwater can be stored
for direct use or can be
recharged into ground
water aquifer.

4. Types of rainwater harvesting
 Rooftop rain water harvesting
 Surface runoff harvesting

5. Rooftop rainwater harvesting
 It is a system of catching rainwater where it falls. In
rooftop harvesting, the roof becomes the catchments,
and the rainwater is collected from the roof of the
house/building. It can either be stored in a tank or
diverted to artificial recharge system. This method is
less expensive and very effective and if implemented
properly helps in augmenting the ground water level
of the area.

7. Surface runoff harvesting
 In urban area rainwater flows away as surface runoff.
This runoff could be caught and used for recharging
aquifers by adopting appropriate methods.

8. Advantages of rainwater harvesting
 Easy to maintain
 Reducing water bills
 Suitable for irrigation
 Reduces demand on ground water
 Reduces flood and soil erosion
 Can be used for several non drinking purposes

9. Disadvantages of rainwater
harvesting
 Unpredictable rainfall
 Initial high cost
 Regular maintenance required
 Certain roof types may seep chemicals or animal
droppings
 Storage limits

10. THANK YOU