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Saving water the right way! - Amal Padmanabhan & Ajith Panicker

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Presented for ADDA Water Workshop III

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Saving water the right way! - Amal Padmanabhan & Ajith Panicker

  1. 1. Saving water the right way! Amal Padmanabhan Ajith Panicker Copyright © Amal Padmanabhan Presented for ADDA Water Workshop III
  2. 2. About us ● A society of 171 flats. ● Located in Doddanekundi. ● Our borewell yield has been depleting. ● Lion’s share of maintenance gets spent on water bills. ● In 2016 we figured out - we have to do something about it.
  3. 3. The first effort to save water ● Door to door campaigns ● Drawing competition for kids ● Going green sessions ● Threats about implementing water rationing
  4. 4. Water savings after campaigns
  5. 5. But our kids did fantastic paintings!
  6. 6. Campaigns failed. But we learnt... ● Social ethics is not easy to build. ● People don’t really know what they are consuming. ● Accountability is the key. ● Campaign yields are too tiny. ● Rationing becomes counterproductive.
  7. 7. What can work?
  8. 8. Three point solution ● Accountability - Flow meters & billing flats based on consumption. ● Reusability - Implement STP water plumbing to flush tanks on individual flats. ● Generation - Increase the water source by tapping into rainwater.
  9. 9. Flow meter - Challenges ● Multiple inlets to the flats. ● Entire apartment plumbing has to be fixed. ● Electronic solutions looked higher on OpEx. ● Multiple flow meters would make it harder to sustain.
  10. 10. Flow meter - Implementation ● Every flat replumbed to have a single inlet from the overhead tank. ● Decided to go for cheap analog meters that also has long life. ● Connected water meters on terrace cleanly. ● Replaced existing GI pipes with good quality CPVC pipes.
  11. 11. Flow meter cluster
  12. 12. Flow meter - Expense ● 25 mm Dashmesh B class flow meter ● Astral SDR 11 CPVC pipes connecting all inlets to flow meter. ● Astral plumbing fittings for all the connections. ● Total cost of 24,06,850₹ for the entire project. ● Per flat capital expense of 14075₹
  13. 13. Flow meter - Billing ● Benefit the conservative users and penalize heavy consumers. ● Incentivize by maintenance discount on saving water. ● Divide borewell yield share to flats per square feet basis. ● We also charge maintenance per square feet basis. ● Calculation example...
  14. 14. Flow meter - Billing example ● Let’s say there are two flats in the society. ● Flat 1 consumed 13000 litres of water and Flat 2 consumed 2500 litres of water. ● Flat 1 is 2000 sq ft and Flat 2 is 1800 sq ft. Totally society has 3800 sq ft. ● Borewell yield for the month was 8000 litres. ○ Flat 1 gets a share of (8000 / 3800) * 2000 = 4210 Litres. ○ Flat 2 gets a share of (8000 / 3800) * 1800 = 3790 Litres.. ● Outside water spending was 2000₹ ○ External per litre procurement cost is 2000 / (13000+2500 - 8000) = 0.266₹ per litre. ● Flat 1 will pay a bill for the litres they consumed above their borewell share, ○ Bill will be (13000 - 4210) * 0.266 = 2343₹ ● Flat 2 will get a discount for their savings in maintenance, ○ Bill will be (2500 - 3790) * 0.266 = -343₹
  15. 15. STP water reuse - Implementation ● Sewage Treatment Plant improved to have additional final tank. ● Implemented dual pipeline to the flats and connected flush tanks to STP line. ● Minimal drilling and cutting work inside the bathrooms. ● Two large overhead tanks supplies water to eight smaller tanks on four blocks. ● No water meter for flush tank pipe line.
  16. 16. STP water reuse - Expense ● Astral SDR 13.5 CPVC ● Astral Plumbing fittings ● Sintex Plastic water tanks ● Metal and concrete tank mounts ● STP additional tank replenishment ● Total cost of 22,81,927₹ ● Per flat capital expense of 13344₹
  17. 17. Rainwater Harvesting ● Implemented rainwater collection system for all our terraces. ● Water from rainwater collection goes to two large filters. ● Filtered water is sent to water sumps and borewell recharge points. ● Filters and terrace cleaned periodically to keep water clean.
  18. 18. Rainwater filter
  19. 19. Rainwater harvesting - Expense Concrete tank for filters PVC pipes for terrace to tank and sump connection Filtering materials. Total cost approximately 5,00,000₹
  20. 20. Water savings after the initiatives! 52% reduction in consumption!
  21. 21. Monthly savings
  22. 22. Q & A A big thanks for successful execution of the plan to, ● Mr Lazar John, Estate manager. ● Mr Niranjan Mahunta, Plumbing lead. ● To all Residents

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