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Bangalore’s water resources

Bangalore’s water resources. A common sight. We see enough of this too. Source: http://www.flickr.com/photos/jpjoshi/4616108862/. Is there a water problem in the city?. How much do we know at a local level. Population? Approximately how much water is supplied to the city?

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Bangalore’s water resources

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  1. Bangalore’s water resources

  2. A common sight

  3. We see enough of this too Source: http://www.flickr.com/photos/jpjoshi/4616108862/

  4. Is there a water problem in the city?

  5. How much do we know at a local level • Population? • Approximately how much water is supplied to the city? • What are the sources of water supply? • What % of water comes from these 2 major sources? • Approximately how much water is lost? • What’s the extent of the shortfall? • How many water treatment plants does the city have? • How much water is treated on a daily basis? • How much sewage is generated on a daily basis? • How many sewage treatment plants are there in the city?

  6. 8 million by 2011 2011 7.9 million 2001 5.76 million 1991 4.5 million Source: Dept of Economics and Statistics, Govt of Karnataka; statistics for Bangalore Urban district

  7. 1150 million litres per day Is what we consume 79% met by surface water (900 MLD) 21% met by groundwater (250 MLD) 5 functional water treatment plants 4 Cauvery, 1 TG Halli (Arkavathy) Losses = 43% 400 million litres /day

  8. Water supply per capita • CPHEEO (Central Public Health and Environmental Engineering Organization) suggests that water supply for metro cities should be 150 lpcd (litres per capita per day) • Existing supply is 110 - 120 lpcd Source: www.bwssb.org

  9. Demand by 2011 = 1576 MLD • Present supply = 900 MLD • Deficit = 676 MLD Demand – supply gap Even after the final stage of Cauvery water supply is implemented, Supply = 1500 MLD

  10. Sewage No. of working STPs (sewage treatment plants) 12 secondary treatment plants +4 tertiary treatment plants 920 MLD generated 720 MLD treated

  11. Where does the treated and untreated sewage go? To the Vrishabhavati and Ponniyar basins. Downstream of Bangalore, these would be freshwater sources

  12. Where does the treated and untreated sewage go? Water from the Vrishabhavati and Ponniyar basins are also used for agriculture, downstream of Bangalore

  13. Other ramifications

  14. Our water travels a long distance and climbs a fair amount too

  15. Energy Three stages of pumping Cost of getting us the water = Rs 18/kl Domestic customers pay = Rs 6 - 36/kl

  16. Has this been the case from ages?

  17. We were A city of tanks and lakes

  18. we are A city of bus stands, bazaars, stadiums Dharmambudi tank Challaghatta tank Koramangala tank Sampangi tank Siddikatte lake Karanji tank Chennamma tank Kempambudhi tank Akkithimmanahalli tank Miller tank

  19. Dharmambudi tank - Majestic Bus depot Challaghatta tank - KGA Golf course Koramangala Tank - National Games village Sampangi tank - Kanteerava stadium Siddikatte lake - City market Karanji tank - Gandhi bazaar area Chennamma tank - a burial ground Kempambudhi - a sewerage collection tank Akkithimmanahalli tank - Hockey Stadium Miller Tank - Guru Nanak Bhavan, schools, and several buildings.

  20. Today • The city is growing • Tanks are disappearing • Tanks that exist receive sewage that cannot be handled by sewage • treatment plants • Municipal water supply is inadequate to meet the growing needs • Unsustainable extraction of groundwater • Groundwater tables have fallen North Bangalore worst affected – 300 m Every year more than 2 m drop in water table

  21. Other problems • Hydraulics network is over 50 years old • 100 years old in some areas. • 95% wastage through leaks

  22. Impacts

  23. Unequal distribution Cholera Ill health Typhoid Jaundice Dengue Dysentery

  24. Periodic flooding in low-lying areas that have been built on earlier tank-beds

  25. Water disputes

  26. What can we do ? Can we run away from this problem? Can we move to another place?

  27. India – status and projections 1 / 6 of World’s Population 1 / 25 of world’s Freshwater Resources Source: TERI

  28. Global Fresh WaterStress Mismatch between regions of large population and available freshwater resources Source: http://www.unep.org/dewa/assessments/ecosystems/water/vitalwater/21.htm#21b 2 / 3 of the world’s population estimated to be underwater-stress conditions. 3 billion people may be affected by water scarcity. By 2025

  29. What can we do ? • Rainwater harvesting • Water audit • Reduce wastage • Fix leaks • Spread knowledge and awareness • Work on interesting projects that give a better understanding – observe and analyze

  30. BWSSB’s plans • Promote rainwater harvesting • Recycle and reuse of wastewater for non potable uses • Dual piping system for new layouts • Restoration of lakes to improve ground water table

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