1. Water
Water and a City
Rebuilding an Urban Water Culture
Biome Environmental Trust
Shubha Ramachandran
2.
3.
4.
5. 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
12. My tap gets its water
from an overhead
tank......
.....to which water is
PUMPED from my sump
tank........
And
My sump
tank
Gets water
from ??
13. But Many people don’t
Have “taps” at home !!!!
(Many places
don’t have
City/municipal connections
and many cant afford it)
Where do they get their
Water from ???
19. What happens to all the water I have already used ??????
Use Litres/person
Drinking 3
Cooking 4
Bathing 20
Flushing 40
Washing-clothes 25
Washing Utensils 20
Gardening 23
Total 135
I use
clean water
And i throw out
Dirty water
What happens to
The rainwater that
falls on
My house ?
27. Rainwater harvesting
components:
1) Catchment
2) Conveyance
3) Filtration
4) Storage
5) Recharge
<<< The saree is the
Catchment, conveyance
And filter !!!!!!
The collection and storage of rain for future productive use
28. 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
30. 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
31. 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
32. ….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
62. Digging an
open well
step by step
First the soil is
excavated to the
desired depth.
You may
encounter rock
or water
inflow/seepage.
The hole is
normally 6”-8”
wider than the
external dia of
the concrete
rings.
These wells can
cost anywhere
between 20k and
100k INR.
63. The soil is
excavated to
the required
depth
Concrete
rings are
lowered in
one by one
into the well
Aggregate or
jelly stones
line the gaps
between the
rings
This
reinforces
the well
structure
