about rainwater harvesting

1. RAINWATER
HARVESTING
BY
BALASUBRAMANIAM.S.P

2. RAIN WATER
HARVESTING

3. WHAT IS
HARVESTING?
– Harvesting is defined as storing in such a way that it can be
used throughout the year.

4. WHAT IS RAIN WATER
HARVESTING?
– Rainwater harvesting is the accumulating and storing of rainwater
by artificial methods for further utilization.
– The principle of collecting and using precipitation from a catchments
surface.
– Mostly done by rooftop harvesting and is used for domestic and
agricultural purposes.

5. WHY IS THIS REQUIRED?
– Surface water is inadequate to meet our demand and we have to depend
on ground water.
– Environmental Changes.
– To arrest ground water decline and augment ground water table
– To beneficiate water quality in aquifers
– To conserve surface water runoff during monsoon
– To reduce soil erosion
– Due to rapid urbanization, infiltration of rain water into the sub-soil has
decreased drastically and recharging of ground water has diminished etc.

6. RAIN WATER HARVESTING
TECHNIQUES :
– Roof top rainwater harvesting.
– Surface runoff harvesting .

8. COMPONENTS OF
ROOFTOP RWH
– CATCHMENT
– COUNDUITS
– FILTERS
– STORAGE FACILITY

9. A first rain separator and a sand
filter

10. EVERY ROOF IN A CITY CAN BE A
CATCHMENT

11. SURFACE RUNOFF
HARVESTING
– Harvesting of surface runoff and storage of
the same into reservoirs such as water pans
makes it available for use when required.
– In this method of collecting rainwater for
irrigation, water flowing along the ground
during the rains will be collected to a tank
below the surface of the ground..

12. USES OF RAINWATER
HARVESTING
– Domestic Use
– Agricultural Use
– Industrial and Commercial use
– Increase groundwater supplies

13. Advantages:
– It provides self-sufficiency to water supply.
– Rainwater harvesting is less expensive, easy to construct
and easy to maintain.
– Rainwater Harvesting slows down water flow, contains
potential floodwater and reduces spread of pollution.
– The water is convenient and accessible; valuable time and
effort are saved in collecting and/or hauling water.
– It provides a supply of water to meet our future needs.

14. Disadvantages:
– Initial cost may be high.
– Regular Maintenance .
– Vulnerable water quality.
– Storage capacity limits.

15. CONCLUSION
– On of the best way to solve the world burning facing issue:
Water Scarcity.
– Most useful for large scale applications.
– Saving of energy per lifting of well and saving of Water bills.
– Harvested water can be used for Daily household needs.
– The more the business and industries involved = greater
environmental and economic benefits.
– Rainwater Harvesting saves water, money and the
environment.

16. Rainwater Harvesting
A NOBLE GOAL
A COMMON RESPONSIBILITY

17. THANK YOU MY
FRIENDS