To explain RWH

1. Water
Rainwater harvesting
Rebuilding an urban
water culture
Shubha Ramachandran
Biome Environmental Trust

3. The liberator – the hole in the
ground which yielded precious
water

4. Did the Buddha drink from this well
? Sarnath 500 BCE

5. Vijayanagar Kingdom –
500 years ago

6. Bangalore – living
history (100 years

9. BANNERGHATTA ROAD

16. Photo : Norma Angelica Hernandez Berna
Ultimate source of all water :
RAIN

17. Local hydrologic cycle

18. Twin problems
Urban FloodingWater Scarcity

19. PARADOX ?

20. Rainwater
harvesting
components:
1) Catchment
2) Conveyance
3) Filtration
4) Storage
5) Recharge
<<< The saree is the
Catchment,
conveyance
The collection and storage of rain for future productive
use

21. MONTH DAYS QUANTITY (mm)
JAN 0.2 2.70
FEB 0.5 7.20
MAR 0.4 4.40
APR 3.0 46.30
MAY 7.0 119.60
JUN 6.4 80.80
JUL 8.3 110.20
AUG 10.0 137.00
SEP 9.3 194.80
OCT 9.0 180.40
NOV 4.0 64.50
DEC 1.7 22.10
TOTAL 59.8 970.00
Rainfall pattern in Bangalore
30 years data

22. How much water can I harvest

23. How much water do I use ?
Use Litres/person
Drinking 3
Cooking 4
Bathing 20
Flushing 40
Washing-clothes 25
Washing Utensils 20
Gardening 23
Total 135
Real Consumption range :
from 50 to 300 liters per person
per day
National Town planning Norms :
Urban : 135 Lpcd
Rural (Karnataka) : 55 Lpcd

24. How much water can I harvest
Plot Size Area(sqm) Avg 30mm
rain runoff
(KL)
Annual
970mm rain
runoff (KL)
No of days
of use
30ft x 40ft 110 3 96 142
60ft x 40ft 220 6 192 285
50ft x 80ft 367 10 321 475

Assumed 5 member families with a daily per capita consumption of
135 litres

Assumed only 90% runoff from rooftops

25. The rains over the past couple of days
- homes in Park Vista, Shubh Enclave, not
had to buy tankers

26. ….So how clean is Rainwater ?....
Rainwater in a Glass
Cauvery water in a Glass
-
Guess
Which is which ?
A Bucket of Rainwater in
Kurubarakunte village, Bangalore

27. A clean roof means clean
water

29. Join all the pipes……

30. Clean Rainwater :FRS &
Filtration

31. First rain separation – let the rain clean the
roof

33. Filter

34. Commercial Filters

37. Bring it to a Storage

38. Rain barrel : easiest way to begin rainwater harvesting

40. LEVELS !!!!

41. Groundwater recharge : Wells &
Borewells

42. Wells
`

43. The pit has reach the silt layer
Pit and concrete rings
Placing of the rings
Recharge Well :The making of a recharge well

46. Recharge wells details
Silt and leaves trap in a stormwater drain
Covers : grilled
or perforated
RCC

48. Rainwater sent for
recharge
Recharging a bore well
Outlet pipe in recharge well

49. Schema Front Section -
Recharge

55. Borewells !
How does it look inside ?

56. Recharging directly into borewells
Need to be very very careful
About water quality

58. BWSSB Act
• 2400sqft and above (existing homes)
• 1200sqft and above (new homes)
• 20 litres of storage/recharge per sqm of
rooftop
• 10 litres of recharge per sqm of non
rooftop
• VALIDATION/INSPECTION process ?

59. Biome Environmental Trust
(Rainwater Club)
shubha@biome-solutions.com
www.rainwaterclub.org
www.biome-solutions.com
1022, 1st floor, 6th Block,
HMT Layout, Vidyaranyapura,
Bangalore – 560 097,
Phone : 080 41672790

60. Waste Water Treatment

67. The product  