Water supply system of Bangalore

1. INFRASTRUCTURE
PLANNING ASSIGNMENT
Water Supply System
(Bangalore and New York City)
Submitted by:
Kriti Trivedi
Sakshi Jain
Namrata Ghosh
Harshita Yadav
Jyoti Yadav

2. Introduction: Bangalore
BANGALORE
Capital of Karnataka and one of the
important industrial centre.
IT capital of India;
Population - 8.5 million.
Area- 709 sq.km
The topography is generally flat and the
western part is hilly.
Has lot of freshwater lakes and water
tanks.
Located at 900 to 940 m above MSL on a
watershed of two principal river basins
Arkavathi to the west and Cauvery to the
east.
Natural system of drainage flow by
gravity.

3. Introduction: New York
NEW YORK
Most populous city in the United States
Population- 8.5 million
Area- 784 sq km
New York City's water supply system is
one of the most extensive municipal
systems in the world. It provides nearly
half the population of New York State
with high-quality drinking water.
The water supply system also provides
about 110 million gallons a day to
approximately one million people living
the counties of Westchester, Putnam,
Orange, and Ulster.
95% of the total water supply is supplied
by gravity. The other 5% needs to be
pumped to maintain pressure

4. Features of Water Supply
Features Bangalore New York
Agency in charge BWSSB DEP, NYW, Water Board
Present population served 8.42 Millions 8.53 Millions
House service connections 8.65 lakhs 8.36 lakhs
Total length of water supply
pipelines
8,746 kms 10,944 kms
Diameter of pipeline 100 to 1800 mm
Number of Sources Cauvery and Arkavathi
river
Catskill, Croton, Delaware
reservoir
Quantity of water
supplied/month
42,200 ML 1,58,970 ML
(1.4 B gallon/day)
Average per capita
consumption
65 L/day 188.8 L
Average cost of water
28 Rs/kL 3.81$/kL
NRW % 49.25 % 10 %
Source: Bangalore CPHEEO,BWSSB and nyc.gov.in

5. BANGALORE

6. The water supply schemes providing drinking water are Hesarghatta, Chamarajasager
(TG WTP and TK Halli WTP)(Yield reduces with failure of monsoon and also the pipes are
not in good Condition), and Cauvery Water Supply Scheme I, II, III.
Water Source
Bangalore city gets water from 2 perennial surface
water sources :
1. Arkavathi River .
1. Cauvery River .
80% of normal
water supply
20% of normal
water supply
Raw water flows by gravity from the reservoir to
Solandevanahalli Pumping Station and is pumped to
Combined Jewel Filters (CJF) and HMT factory. Raw water
received at CJF, Malleswaram is treated before supplying to the
consumers.
100 Km south of the city.
Open Channel is constructed to carry water for water supply
schemes and to meet the requirement of hydro power station.

7. The total capacity of GLRs : 617 MLD
Due to an undulating topography with level difference varying upto 100 m , it is
necessary to construct GLRs where high ground elevations are available to supply water
to the surrounding area.
Water Distribution System
Pipe materials : cast iron and pre cast
pipes
Pipe diameter :
•Feeder main - 150 to 900 mm
• trunk main - 375 to 900 mm.
Supply Hours
• domestic consumer - 3 to 4
•industrial consumers -4 to 6
1. Direct tapping from Transmission
main
2. GLRs and OHTs
3. Directly pumping through trunk
mains into the distribution system
using booster pumps.

8. Water Treatment
TG Halli
Consists of settling
tank and rapid sand
filter (RSF - 10 units)
Clarifier (4 nos.)
and filter beds (8
nos.) of 6.7 MLD
capacity.
In 3 stage one clariflocculator
(20.4 MLD) and filterbeds (3
nos.) of 7 MLD capacity were
added
TK Halli
The treatment units
include 3 clarifier and
12 RGF in each stage
In 3 stage 6
clarifier and 24
RGF.
Filtered water is carried to the pumping station at
TK Halli, Haro Halli and Tataguni.
2 Water Treatment
Plant
(WTP)
TG Halli
TK Halli
Arkavathi river
Treats Water from
Cauvery river
1. Filtration
2. Pre-chlorination
3. Post chlorination.
4. Aeration(Due to
trace of Iron)
The treated water is stored at Thorekkera intermediate
pumping station before distribution to the City. Presently
Alum and Polyaluminium Chloride are used as coagulants.
From NBR water is treated at TK Halli and
flows by gravity pipelines to Stage I, II, and
III for distribution. The total distance
between Shiva Anicut and WTP is
about 19 km. The WTP at TK Halli is almost
360 m below the city level and hence the
clear water transmission is by pumping to
various service reservoirs in the city.
Conventional type of
treatment

9. NEW YORK

10. Water supply System
Source
Catskill/
Delaware
90% of city
supply
Croton
10% of city
supply
Surface supply system that comprises
19 reservoirs and three controlled lakes
spread across a nearly 2,000-square-mile
watershed.
This complex system relies on a
combination of aqueducts, reservoirs,
and tunnels to meet the daily needs
of New York City.

11. Water Treatment System
• Due to the very high quality of our Catskill/Delaware supply, New York City is
one of only five large cities in the country with a surface drinking water supply
that does not require filtration as a form of treatment.
• Basic Treatment is done at the source itself
Filtration Avoidance Determination
Disinfectation
Chlorine
to kill germs and stop
bacteria from
growing in pipes.
Ultra Violet
UV light inactivates
potentially harmful
microorganisms.

12. 552 786 541 120
514
0
2000
4000
1991 2001 2007 2011 2025
Demand Supply Gap
Supply Demand Gap
150 litre of
water per
day as per
Standards
but
presently
gets 65 litre
per day
Bengaluru
consumes
50 percent o
f Cauvery
water
reserved for
domestic
use in
Karnataka.
Borewell
water not
being
potable
since
sewage
generated is
not
treated.
Non
Revenue
Water-
49.25%
Revenue
Income-230.70
crores
Revenue
Expenditure-
255.43 crores
Deficit- 24.73
crores
Issues: Bangalore

13. Conclusion
Bangalore
Water Conservation programme
Effective water demand
management
Water loss reduction programme
Effective Public outreach programme
Rain Water Harnessing from Urban
Catchment
New York
Maintaining watershed
protection
Water quality remains
excellent
Water quality improvements
linked to protection programs
Partnerships with local entities key
InordertotackletheissuesBWSSBand
NYWismakingeffortstowards