Rainwater harvesting slide for civil engineering seminar

1. A SEMINAR PRESENTATION
RAINWATER HARVESTING
ON
IMLIMEREN LONGCHAR
SUBMITTED BY

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.
 Bangalore gets most of its drinking water from a distance of 95
kms. and a depth of 500 mts.

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
(First Flush)

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. .