dafajfml

1. Presentedby
MD FAIZ ALI
13U61A0104

2. contents
 Introduction.
 Concept and Technology.
 Average Rainfall of States in India.
 Runoff Coefficients for Various Catchments Surfaces.
 Rainwater Harvesting System.
 Treatment Techniques.
 Materials for Rainwater Tanks.
 Components of Rainwater harvesting.
 Conclusion.

3. W
H
A
TISwaterharvesting?
It is theactivityof directcollectionof
rainwater.
Water harvesting means capturing rain
water, where it fallsand capture the
runoff from, catchment and streams etc.
Generally,waterharvesting isdirect
rainwatercollection.Thiscollected water
could be stored for lateruseand
recharged into theground wateragain.

4. RainW
aterinIndia
Total annual rainfall in India:
(area x height)
 India’s area:329 million
hectares
 If evenly spread, average
height: 1.28m
 329 X 1.28 = 421.12millimiters

5. erage ana n na
Sl.N
o
States Meteorological Divisions A A R (mm)
01
Andaman and
Nicobar Andaman and Nicobar Islands 2,967
02 Arunachal Pradesh Arunachal Pradesh 2,782
03 Assam Assam and Meghalaya 2,818
04 Meghalaya Assam and Meghalaya 2,818
05 Nagaland
Nagaland, Manipur, Mizoram an
Tripura 1,881
06 Manipur
Nagaland, Manipur, Mizoram and
Tripura 1,881
07 Mizoram
Nagaland, Manipur, Mizoram and
Tripura 1,881
08 Tripura
Nagaland, Manipur, Mizoram and
Tripura 1,881
09 West Bengal
Sub-Himalayan West Bengal and
Sikkim 2,739
Gangetic West Bengal 1,439
10 Sikkim
Sub-Himalayan West Bengal and
Sikkim 2,739

6. W
H
YW
A
T
E
RHAR
VESTINGISIMPOR
T
ANT
?
Toconserve & augmentthestorageof
ground water
To reduce water table depletion
To improvethequalityof ground water
To arrest sea water intrusion in coastal
areas
Toavoid flood & waterstagnation in
urban areas

7. T
echniquesofrainwaterharvestings.
Thereare two main techniques
of rain water harvestings.
 Storage of rainwater on surface for future use.
 Recharge to ground water.

8. RAIN WATER HARVESTING
Rain
Roof Top
Filtration
Storage
Recharge to ground water

9. T
echnologyforRainwaterHarvesting

10. ExampleofSmalllevelRainWaterharvestinginvillagesinIndia

11. Rain Water Distribution &
Management

12. MasonryTanks
Reinforced Cement Concrete Tank
(RCC)
Ferro Cement Jars
 Pot shaped container:
 Ferro cement Tank using
Skeletal Cage

13. Potshaped
container
FerroCement
Jars
RCC Tank
Masonry Tank FTSC Tank

14. DetermineTankCapacity
For Rectangular Tank
Height x Length x Width =
Cubic Feet x 7.47 = Gallons
Round Tank
π × R² × H=
Cubic Feet x 7.47 = Gallons

15. DeterminetheAmountofrainfall
Thevolumeof water
collected in the pan
is:
V (m3) = L (m) x w (m) x d (m) =
1 m x 1 m x 0.010 m = 0.01 m3 or
10 liters
10 mm rainwater collected
in thecontainer

16. T
reatmentT
echniques
Screening
Methods Location Results
Strainers and
Leaf Screens
Gutters and
Leaders
Prevent
leaves and
other
debris from
Settling
Sedimentatio
n
Within Tank Settles
particulate
matter

17. Filtering
In-line/Multi-Cartridge
•Activated Carbon
•Reverse Osmosis
•Mixed Media
•Slow Sand
After Pump
At Tap
At Tap
Separate Tank
Separate Tank
Sieves sediment
Removes chlorine
Removes contaminants
Traps particulate matter
Traps particulate matter
Disinfecting
Boiling/Distilling
ChemicalTreatments
Ultraviolet Light
Ozonation
Before use
Within tank
After the
activated
carbon filter
•Before Tap
Kills microorganisms
Kills microorganisms
Kills microorganisms
Kills microorganisms

18. ComponentsofaRainwaterHarvestingSystem
The Roof
Gutters
Gutter Guard
Downspouts
Debris Traps
Final Sediment Filtration
First Flush Diverter
Surge/Pump Tank
Water Storage
Water Disinfection
Design & Maintenance

19. Cloud
Rain Fall
Catchment
Gutter
Downtake Pipe
Storage Delivery
Pipe
First Flush
Filter

20. MaterialsforRainwaterT
anks
Plastic:
Plastic Liner:
 Polyethylene:
Metal:

21. The earth has an abundance of water, but unfortunately only a
small percentage (about 2.5%) is even usable by humans. The
other 97.5% is in the oceans, soils, icecaps, and floating in the
atmosphere.
Earth contains as
Sea+Oceans = 96.5%
Ground water = 1.7%
Glaciers = 1.7%
Vapor+Air = 0.001%
Only 2.5% of this water is freshwater.
Finally its very important to serve everything on
this planet

22. THANKYOU