Concept Of rainwater harvesting Why rainwater is harvested Rainwater harvesting today Not new to India Johads of Rajasthan Rain water harvesting potential in India Rain water harvesting system How to harvest rain water Components of roof top rainwater harvesting system Filters used Methods of roof top rain water harvesting Advantage of rainwater harvesting Do's and Dont's

1. K.I.E.T. GROUP OF INSTITUTION
GHAZIABAD
MAYANK KUMAR SINGH
4TH YEAR
A
1302900062
CIVIL ENGINEERING DEPARTMENT

2. CONCEPT OF RAINWATER HARVESTING -
 It is the activity of direct collection of rain water.
 Rain water can be stored for direct use or can be
recharged into the ground water aquifer.
 Rainwater harvesting is the process of
augmenting the natural filtration of rainwater in
to the underground formation by some artificial
methods.
"Conscious collection and storage of rainwater to
cater to demands of water, for drinking, domestic
purpose & irrigation is termed as Rainwater
Harvesting."

3. CONTINUE………..
Rainwater harvesting is a simple, economical and
eco-friendly technique of preserving every drop
of water by guiding the rainwater that falls to
bore wells, pits and wells through small
diameter pipes. Let us all work together to
overcome the problem of water scarcity in Delhi
by harvesting this precious bounty of nature.
Join the Rain Water Harvesting Drive.

4. WHY RAINWATER IS HARVESTING -
 To reduce water table depletion.
 To improve the quality of ground water .
 To arrest sea water intrusion in coastal areas.
 To avoid flood & water stagnation in urban areas.
 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.
 To inculcate a culture of water conservation.

5. RAINWATER HARVESTING TODAY -
Collection (Catchment)
Flat / sloping roofs
Leaf and grit
filter, First
flush device
Transportation: Downtake
pipes
Storage in
tanks
Recharge into open wells / bore
wells / percolation pits /
trenches

6. NOT NEW TO INDIA -
Rainwater storage reservoir at Dholavira (Rann of Kutch) – Harappan civilization (2500-
1900 BC)

7. JOHADS OF RAJASTHAN
(PROVIDE WATER FOR DOMESTIC USE)
Earthen or masonry rainwater harvesting structure, for providing water for domestic use to
the communities.

8. RAIN WATER HARVESTING POTENTIAL IN
INDIA -

11. HOW TO HARVEST RAIN WATER -
Broadly there are two ways of harvesting rainwater :-
 Surface runoff harvesting
 Roof top rainwater harvesting
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.
Roof Top Rainwater Harvesting (RTRWH) :-
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.

12. CONTINUE…….
1. Recharge Pit
Suitable for roof top area up to
100sq.metres
2. Abandoned/ Running Hand Pump
Suitable for roof top area up to
150sq.metres

13. CONTINUE…….
3. Abandoned Dug Well
Suitable for roof top area more than
1000sq.metres
4. Recharge Trench
Suitable for roof top area 200 to
300sq.metres

14. CONTINUE…….
5. Gravity Head Recharge Well
Suitable for roof top area more than
400sq.metres
6. Recharge Shaft
Suitable for roof top area greater than
1500 sq.metres

15. COMPONENTS OF ROOF TOP RAINWATER HARVESTING
SYSTEM -
The system mainly constitutes of following sub components :-
a) Catchment
b) Transportation
c) First flush
d) Filter Sand Gravity Filter
Charcoal Filter
PVC Pipe Filter
Sponge Filter

16. FILTERS -
2. Charcoal Filter1. Sand Gravity Filter
3. PVC Pipe Filter 4. Sponge Filter

17. METHODS OF ROOF TOP RAIN WATER HARVESTING -
Ground water aquifers can be recharged by various kinds of
structures to ensure percolation of rainwater in the ground
instead of draining away from the surface. Commonly used
recharging methods are :-
 Storage of Direct Use
 Recharging Ground Water Aquifers
Recharging of bore
wells
Recharging of dug wells
Recharge
pits
Recharge Trenches
Soak ways or Recharge
Shafts
Percolation Tanks

18. CONTINUE.......
1. Recharging of Bore Wells 2. Recharge Pits
3. Recharge Shafts

19. CONTINUE.......
4. Recharging of Dug Wells
5. Recharge Trenches

22. DO’S AND DON’TS -
Harvested rainwater is used for direct usage or for recharging
aquifers. It is most important to ensure that the rainwater caught
is free from pollutants. Following precautionary measures
should be taken while harvesting rainwater:-
 Roof or terraces uses for harvesting should be clean, free from
dust, algal plants etc.
 Roof should not be painted since most paints contain toxic
substances and may peel off.
 Do not store chemicals, rusting iron, manure or detergent on the
roof.
 Nesting of birds on the roof should be prevented.
 Terraces should not be used for toilets either by human beings or
by pets.

23. CONTINUE…….
 Provide gratings at mouth of each drainpipe on terraces to trap
leaves debris and floating materials.
 Provision of first rain separator should be made to flush off first
rains.
 Do not use polluted water to recharge ground water.
 Ground water should only be recharged by rainwater.
 Before recharging, suitable arrangements of filtering should be
provided.
 Filter media should be cleaned before every monsoon season.

27. THANK YOU