The document discusses water supply and management issues in Bengaluru city. It notes that Bengaluru's population has exceeded 10 million and water demand is increasing rapidly. The city's existing water sources of Arkavathi and Cauvery rivers are limited and groundwater levels are declining. Other challenges include water losses, equitable distribution, aging infrastructure, and impacts of climate change. It presents statistics on current and projected water usage in India and other countries. It also discusses strategies to improve supply such as water recycling, reducing losses, harvesting rainwater, and developing new sources.

1. FOCUS ON BENGALURU CITY

4. e The
Charting our Water Future” looks at four case studies: China,
Brazil (Sao Paulo), India and South Africa. Below is each
countries projected water consumption
Country Current Demand in
Supply* 2030*
China 618 818
Brazil 18.7 20.2
India 740 1500
South Africa 15 17.7
*Billions of meters cubed

5. The challenges before
BWSSB
a) Diminishing water resources (Arkavathi source)
b) Increased Water Demand
c) Inequitable distribution
d) Water Quality (catchment to consumer)
e) Aged Assets
f) High level of NRW (Non Revenue Water)
g) Water Security
h) Climate change and it’s impact on water resources
i) Aged sewer age system
j) Revision of tariff
k) New water resources for augmenting
l) Capacity building
5

6. PLAN SHOWING THREE SOURCES OF WATER SUPPLY TO
BANGALORE CITY
In MLD
Year of Optimu
Assumed
Across the River Commission m
flow
ing Drawal
Arkavathy
1896 36
Arkavathy 1933 148 50
Cauvery I stage 1973 135 135
Cauvery II stage 1982 135 135
Cauvery III stage 1993 270 270
Cauvery stage IV
Phase I 2004 270 270
Cauvery stage IV
Phase II 2012 500 215
TOTAL 1494 1075
BEYOND CWSS WHAT NEXT ?

7. Bruhat Bangalore
Mahanagara palika
Jurisdiction map

8.  Population of Bengaluru has crossed 1.00 crore
and is still increaseing very badly
 Old resources are completely non dependent ie
Hessaragatta & TG hally under Arkavathy
river
 Water allocation to Bangalore from Cauvery is
only 1-85 tmc But GOK has alloted additional
17 tmc from it’sallocation
 Ground water situation is very bad , water
table depleting 1-2m every year

9. Hessarghatta Lake

10. Intake Tower Hesarghatta Aqueduct
Sheshadri Iyers Volute Siphon Soladevanahalli Pump house

11. THIPPAGONDANAHALLI
Water Treatment Plant - T.G.
T.G. Halli Reservoir view
Halli

12. Shiva Anikat
Intake

13.  Loss of water from intake
to treatment plant
 Loss of water in treatment
process
 Loss of water in
transmission mains
 Loss of water in
distribution mains (trunk,
feeder, distribution,
service mains) due to
ageing, corrosion, bursts,
damage, etc.
 Loss of water due to
illegal connection, meter
tampering etc

14. Tree of water resources recycling

15. Categories of wastewater reuse

16. BIRDS EYE VIEW OF YELAHNAKA RECYCLING PLANT

17. RECENTLY INSTALLED RECYCLING PLANT AT
BANGALORE (UNDER PRIVATE SECTOR)
Name & Location of Capacity of Proposed for which Status
the plant the plant recycled water to be
used
1. Bangalore Golf 1.00 Water for Lawns and Functioning from
Club MLD other non potable use last 14 years
2. Lalbagh 1.50 Water for Lawns and Functioning from
MLD to replenish water to last 7 years
the Lalbagh lake
3. Karnataka Golf 1.50 Water for Lawns and Functioning from
Club MLD other non potable use last 10 years
4. Cubbon Park 1-50 Water for Lawns of
MLD Vidhanasoudha Functioning from
Cubbon Park and last 6years
other non potable use

18. Leaks – 13.7% Other – 2.3%
Dishwasher – 1.4% Toilet – 26.8%
Bath – 1.7%
Faucet – 15.7%
Shower – 16.7% Clothes Washer – 21.7%
Source: Awwa Research Foundation (1999)

19.  Wash laundry & dishes
with full loads
 Always turn off running
water
 Take shorter showers
 Eliminate any and all leaks
 Reduce the flow of toilets &
showerheads

20. Report leaking sinks
and toilets.

21. Zero discharge of sewage into Storm Water
 Drain
In view of various Technical, social, institutions problems, present the
sewage generated in the city is not conveyed to sewage treatment plat
even though there is adequate treatment capacity of STP’s inside the
BMA area.
K & C Valley STP diffused aeration 30 MLD STP at K & C Valley
pump

22. 1. Inadequate carrying capacity
2. Corroded & damaged sewers
3. Sewers with reverse / flat gradient
4. Sewers not linked to system
5. Sewers not provided in certain areas
6. Sewers displaced during floods
7. Sewers connected to drains directly
8. Manholes damaged for irrigation
9. Manholes overflowing due to blockage by the solid
wastes dumped into manholes
10. Manholes and sewers encroached

23.  Zero Discharge of Raw Sewage into Storm Water
Drains
 Clean living Environment
 Reduction in damaged Assets
 Improved water quality in Lakes
 Improved Ground Water Quality
 Improvement in fish life and aquatic ecology
 Improved Aesthetics
 Improvement in Public Health & quality of life
 Appreciation of property values
 Socio-Economic Improvement

24. Schematic presentation of an onsite grey water
treatment and reuse system for an individual house

25. GRAY WATER

26.  ALTERNATE SOURCES HAVE TO BE
identified such as ;
 Reduction of Unaccounted for water
 Reuse of waste water (sewage) for potable and
non potable uses
 Rain water harvesting , micro and macro level
 Efficient management of water by utility
 Conservation of water by using highly efficient
plumbing fixtures by consumers
 Industries must embark on water audit