This document discusses actions taken by BWSSB to prevent pollution of lakes in Bangalore's valley systems. It notes the city's unplanned growth and lack of infrastructure have led to lake pollution. BWSSB is undertaking various projects to build sewer networks, rehabilitate existing systems, and create additional wastewater treatment capacity in order to treat the city's sewage and prevent it from entering the lakes and drainages. Once completed, these projects are expected to benefit 70 lakes across 7 local body areas by reducing pollution loads in their watersheds.

1. Action taken by BWSSB
in preventing pollution
of Lakes

2. Bangalore Valley System
 Well defined valleys
– 4 Major valleys
 Koramangala
 Challaghatta
 Hebbal
 Vrishabhavathi
– Minor valleys
 Arkavathi, Kathriguppe and Kethamaranahalli
(Vrishabhavathi Valley)
 Taverekere (Koramangala valley)

3. BANGALORE’S CASCADING LAKES
SERIES

4. Reasons for pollution of Lakes
 Un planned growth of city
 Un sewered pockets such as slums and erstwhile CMC areas
 Damage of main sewers
 Blockages and overflows in the sewer system
 Direct letting out of raw wastewater into storm water
drainage system from un-sewered as well as sewered pockets
 Lack of adequate infrastructure facilities
 Dumping of solid waste within the drainage zones

5. Sewerage management in Bangalore
Facts
 Total sewage generated in Bangalore – 1000 MLD
 Sewerage connections – 8 Lakh
 Sewerage network
Laterals (< 300 mm dia) – 3367 Kms
Trunk Sewers (>300 mm dia) – 302 Kms
 Number of plants – 14
 Sewage treatment capacity – 721 MLD
 Average Present treatment – 453 MLD

6. Measures for abating Lake Pollution
1) Replacement/ Rehabilitation/ Up gradation of
old sewerage net work – Laterals and Trunk
sewers in core city
2) Creation of New Sewerage Net Work
 Erstwhile CMC area – 2300 Kms
 110 Villages – 2000 Kms
Total – 4300 Kms
3) Creation of Additional Treatment capacity to
treat wastewater produced in the new areas

7. On going projects
Environmental Action Plan – A
 Replacement and Rehabilitation of existing
sewers
 Total length – 33 Kms
 Cost – Rs. 47 Crores under NRCP
 Work is completed

8. On going projects
Environmental Action Plan – B
 Replacement and Rehabilitation of existing
sewers
 Total length – 70 Kms
 Taken up under 8 packages
 Cost – Rs. 176 Crores under JnNURM & JICA
 Project period 2010-2013

9. On going projects
Zero Flow in Hebbal drainage zone
 Length – 19 Kms
 Taken up under 3 packages
 Cost – Rs. 35 Crores under BWSSB funds
& Mega city funds
 Project period 2010-2013

10. On going projects
Providing UGD Facilities to 8 ULBs in BBMP area
• Estimated Cost : Rs. 1098.15 Crore
• Amount put to bid : Rs. 966.21 Crore
• Awarded Cost : Rs. 1191.79 Crore
• Funding : JnNURM - World Bank
• Project Period : 4 Years
• Length of pipeline to be laid : 2300 Kms
• Number of packages : 24

11. On going projects - progress
Sl ULB’s Total Pipe Progress Percentage Completion
No. laying Qty achieved in Date
to be Kms
achieved in
Kms
1 Yelahanka CMC 60.28 57.82 95.92% Feb-13
2 Byatarayanapura CMC 468.81 269.46 57.47% Feb-14
3 Mahadevapura CMC 357.11 155.81 43.63% Sep-15
4 Krishnarajapuram CMC 314.85 246.91 78.42% Feb-14
5 Bommanahalli CMC 466.91 260.84 55.86% Feb-14
6 Rajarajeshwarinagar CMC 117.22 78.37 66.85% Feb-14
7 Kengeri TMC 57.62 14.1 24.47% Sep-14
8 Dasarahalli CMC 470.92 374.61 79.54% Feb-14
TOTAL 2313.72 1457.91 63.01% Sep-15

12. Future projects
 Construction of new treatment plants
 11 Numbers under JICA assistance
 339 MLD Capacity with nutrient removal treatment process
 300 MLD plant at V Valley at a cost of Rs. 396 Crore
 Environmental Action Plan – C
 Cost – Rs. 360 Crores
 Length – 109 Kms
 Water supply and Sanitation to 110 Villages
 Awaiting clearance from Central Government

13. Treatment plants proposed under CWSS Stage IV Phase II
Name Capacity in MLD Process (Including BNR)
Raja Canal 40 Extended Aeration (EA)
Horamavu Agara 20 Sequential Batch Reactor (SBR)
Nagasandra 20 SBR
Chikkabanavara 5 SBR
Kadugodi 6 SBR
Kachohalli 3 Membrane Bio – Reactor
Kengeri 60 Activated Sludge Process (ASP)
K & C Valley 60 ASP
Bellandur Amanikere 90 ASP
Doddabele 20 SBR
Yellemallappa Chetty Kere 15 SBR
Total 339

14. Quantity of used water treated in
the existing treatment plants
Average daily inflow in ML
Month 2006 2007 2008 2009 2010 2011 2012
January 198.89 246.07 210.01 307.00 303.28 271.98 259.98
February 233.55 247.32 216.15 316.33 318.15 251.02 277.56
March 236.92 234.59 264.28 313.87 330.55 261.97 275.28
April 269.88 264.22 305.91 277.75 276.15 274.92 270.90
May 310.17 276.99 294.20 251.55 323.67 251.50 249.71
June 224.34 299.24 304.44 244.93 307.66 279.12 285.55
July 245.12 289.05 278.76 236.87 308.70 304.51 356.58
August 253.33 327.73 301.85 275.66 306.78 285.22 354.27
September 295.74 268.33 257.06 292.62 285.64 252.68 356.13
October 301.31 247.88 261.78 271.95 297.04 304.74 383.27
November 288.76 238.10 264.39 265.12 301.92 309.28 379.74
December 245.59 217.67 303.05 269.91 275.20 249.00 384.29
Average 258.72 263.18 272.75 276.72 302.88 274.81 320.50

15. Monthly Average inflow to treatment plants in MLD
Treatment Plant and capacity January-13 February-13 March-13
V Valley 180 MLD 68.17 67.18 74.45
Mailasandra 75 MLD 47.14 48.99 52.58
Nagasandra 20 MLD 7.24 5.68 7.34
Hebbal 60 MLD STP 18.25 34.16 34.16
Yelahanka 10 MLD STP 4.28 5.21 5.51
Jakkur 10 MLD STP 4.44 4.70 4.91
Raja Canal 40 MLD STP 19.00 28.04 39.35
K R Purum 20 MLD STP 9.89 12.38 12.18
Kadabeesanahalli 50 MLD 27.44 36.43 36.12
K & C Valley 218 MLD 144.85 148.09 149.64
K & C Valley 30 MLD 28.89 28.81 30.27
Lal Bagh 1.50 MLD 1.20 1.08 1.08
Cubbon Park 1.50 MLD 1.06 1.25 0.85
Madivala 4 MLD 3.79 3.79 3.79
Kempambudhi 1 MLD 1.00 1.00 1.00
Total - 721 MLD 386.64 426.76 453.22

16. Benefits after the completion of UGD works under KMRP
Erstwhile ULB Name of the Lake No. of
lakes
Yelahanka Attur, Puttenahalli, Yelahanka, 6
Allalasandra, Jakkur, Shivanahalli
Bytarayanpura Chikkabanavara, Singapura, 15
Abbegeri, Vidrayanapura,
Doddabommasandra, Tindlu,
Hebbal, Nagavara, Jakkur,
Rachenahalli, Amruthahalli,
Hennur, Byrathikhane, Kalkere,
Rampura

17. Benefits after the completion of UGD works under KMRP
Erstwhile Name of the Lake No. of
ULB lakes
Mahadeva Munekollal, Sadaramangala, 18
pura & K R Bhattrahalli, Vengeankere,
Purum Ramamurthy Nagar, Basavapura,
Yellemallappa Chetty, Kaggadasapura,
Vibhuthipura, Varthur,
Mahadevapura, Ganghadhar,
Doddakundenahalli, Kundenahalli,
Rajupallya, Benniganahalli, Sigehalli,
Siddapura

18. Benefits after the completion of UGD works under KMRP
Erstwhile Name of the Lake No. of
ULB lakes
Bommana Jaraganahalli, Chunchanaghatta, 16
halli Puttenahalli, Kothunur, Arekere,
Hulimavu, Madivala, Agaram, Varthur,
Begur, Chikkabegur, Singasandra,
Kadagi Singasandra, Somasundra
palya, Garvibhavpalya, Hosapalya
R R Nagar Mallathahalli, Hosakere, Kengeri, 5
& Kengeri Dubasapalya, Halgevadrahalli

19. Benefits after the completion of UGD works under KMRP
Erstwhile Name of the Lake No. of
ULB lakes
Dasarahalli Dasarahalli, Doddabidrakallu, 10
Herohalli, Laggere, Shivapura,
Pillappakatte, Bagalkunte,
Mallasandra, Chikkabanavara,
Nelegadaranahalli
Total 70