Water and sanitation The roof as saviour Hubli

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How can a roof in tropical India become part of the water and sanitation solution? One way is here...

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Water and sanitation The roof as saviour Hubli

  1. 1. Water and sanitation the roof as saviour Thinking out of the box for some solutions S.Vishwanath www.rainwaterclub.org
  2. 2. In rural area
  3. 3. An above the ground storage tank
  4. 4. Rooftop rainwater harvesting is now replicated in many places
  5. 5. Roof-scape Bengaluru.................................... 50% of a city .......
  6. 6. Roofs are <ul><li>Sterile, </li></ul><ul><li>Uninteresting and </li></ul><ul><li>Heat sinks </li></ul>
  7. 7. Can roofs be smarter ? <ul><ul><ul><li>Since they receive </li></ul></ul></ul><ul><ul><li>maximum sunlight and heat </li></ul></ul><ul><ul><li>all the rain </li></ul></ul><ul><ul><li>lots of wind and </li></ul></ul><ul><ul><li>a whole bunch of birds, butterflies and bees </li></ul></ul><ul><ul><li>Can they solve Bangalore’s </li></ul></ul><ul><ul><ul><li>water, wastewater, energy, sewage, food and bio-diversity problem ? </li></ul></ul></ul>
  8. 8. How about? A roof that grows rice
  9. 11. Uses only treated grey water to grow
  10. 12. Use ‘Ecological Sanitation’ generated fertilizer
  11. 13. Bamboo Eco-san toilet on the roof
  12. 14. <ul><li>COMPOSTING TOILET (SQUATTING PAN) </li></ul>
  13. 15. BATHROOM LAYOUT
  14. 16. COLLECTORS
  15. 17. BEFORE AND AFTER ECOSAN <ul><li>CONSUMPTION (ltrs of water/day) </li></ul><ul><li>DRINKING 3 </li></ul><ul><li>COOKING 4 </li></ul><ul><li>BATHING 15 </li></ul><ul><li>CLOTHES 23 </li></ul><ul><li>UTENSILS 25 </li></ul><ul><li>GARDEN 25 </li></ul><ul><li>FLUSHING 40 </li></ul><ul><li>TOTAL 135 </li></ul><ul><li>3 </li></ul><ul><li>4 </li></ul><ul><li>15 </li></ul><ul><li>20 ECOSAN </li></ul><ul><li>25 saving </li></ul><ul><li>0 67.5 </li></ul><ul><li>0.5 </li></ul><ul><li>67.5 </li></ul>
  16. 18. RAINWATER AND ECOSAN <ul><li>BANGALORE’S SCENARIO </li></ul><ul><li>100 SQ MT OF ROOF </li></ul><ul><li>PRODUCES: </li></ul><ul><li>97,000 LITRES RAIN </li></ul><ul><li>88,000 LITRES HARVESTED </li></ul><ul><li>DEMAND: </li></ul><ul><li>67.5 Ltrs/day X 4 pers X 365 </li></ul><ul><li>= 98,550 LITRES </li></ul><ul><li>OUTCOME: </li></ul><ul><li>325 DAYS OF WATER DEMAND SUPPLIED FROM RAIN </li></ul><ul><li>ZERO SEWAGE RUNOFF </li></ul><ul><li>NUTRIENTS USED </li></ul>
  17. 19. Harvests rain
  18. 20. Uses the Sun
  19. 21. Roof <ul><li>100 sq. mt. 100,000 litres of water </li></ul><ul><li>100 sq. mt 200 kgs of rice and vegetables </li></ul><ul><li>100 sq. mt. All the grey water –100 ltrs/day </li></ul><ul><li>100 sq.mt All the urine 1500 litres / year </li></ul><ul><li>100 sq. mt All the solid waste generated </li></ul><ul><li>100 sq mt 32 different species of birds </li></ul><ul><li>100 SQ mt heat 100 litres daily </li></ul><ul><li>Light 12 bulbs </li></ul><ul><li>Cook for 4 people lunch and dinner </li></ul>
  20. 22. So what can a smart roof do? <ul><li>Provide </li></ul><ul><ul><li>Food security… and grow rice, banana, vegetables </li></ul></ul><ul><ul><li>Water security .. and treat waste water </li></ul></ul><ul><ul><li>Energy security… and keep the house cool </li></ul></ul><ul><ul><li>Ecological security… and help save the sparrow </li></ul></ul>
  21. 23. The future then… <ul><ul><li>50% of built Bangalore is roofs. </li></ul></ul><ul><ul><li>What do we do about them? </li></ul></ul><ul><ul><li>Heat sinks </li></ul></ul><ul><ul><li>or </li></ul></ul><ul><ul><li>Designed Ecological spaces </li></ul></ul><ul><ul><li>The choice is ours. </li></ul></ul>

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