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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...

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

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  • 1. Water and sanitation the roof as saviour Thinking out of the box for some solutions S.Vishwanath www.rainwaterclub.org
  • 2. In rural area
  • 3. An above the ground storage tank
  • 4. Rooftop rainwater harvesting is now replicated in many places
  • 5. Roof-scape Bengaluru.................................... 50% of a city .......
  • 6. Roofs are
    • Sterile,
    • Uninteresting and
    • Heat sinks
  • 7. Can roofs be smarter ?
        • Since they receive
      • maximum sunlight and heat
      • all the rain
      • lots of wind and
      • a whole bunch of birds, butterflies and bees
      • Can they solve Bangalore’s
        • water, wastewater, energy, sewage, food and bio-diversity problem ?
  • 8. How about? A roof that grows rice
  • 9.  
  • 10.  
  • 11. Uses only treated grey water to grow
  • 12. Use ‘Ecological Sanitation’ generated fertilizer
  • 13. Bamboo Eco-san toilet on the roof
  • 14.
    • COMPOSTING TOILET (SQUATTING PAN)
  • 15. BATHROOM LAYOUT
  • 16. COLLECTORS
  • 17. BEFORE AND AFTER ECOSAN
    • CONSUMPTION (ltrs of water/day)
    • DRINKING 3
    • COOKING 4
    • BATHING 15
    • CLOTHES 23
    • UTENSILS 25
    • GARDEN 25
    • FLUSHING 40
    • TOTAL 135
    • 3
    • 4
    • 15
    • 20 ECOSAN
    • 25 saving
    • 0 67.5
    • 0.5
    • 67.5
  • 18. RAINWATER AND ECOSAN
    • BANGALORE’S SCENARIO
    • 100 SQ MT OF ROOF
    • PRODUCES:
    • 97,000 LITRES RAIN
    • 88,000 LITRES HARVESTED
    • DEMAND:
    • 67.5 Ltrs/day X 4 pers X 365
    • = 98,550 LITRES
    • OUTCOME:
    • 325 DAYS OF WATER DEMAND SUPPLIED FROM RAIN
    • ZERO SEWAGE RUNOFF
    • NUTRIENTS USED
  • 19. Harvests rain
  • 20. Uses the Sun
  • 21. Roof
    • 100 sq. mt. 100,000 litres of water
    • 100 sq. mt 200 kgs of rice and vegetables
    • 100 sq. mt. All the grey water –100 ltrs/day
    • 100 sq.mt All the urine 1500 litres / year
    • 100 sq. mt All the solid waste generated
    • 100 sq mt 32 different species of birds
    • 100 SQ mt heat 100 litres daily
    • Light 12 bulbs
    • Cook for 4 people lunch and dinner
  • 22. So what can a smart roof do?
    • Provide
      • Food security… and grow rice, banana, vegetables
      • Water security .. and treat waste water
      • Energy security… and keep the house cool
      • Ecological security… and help save the sparrow
  • 23. The future then…
      • 50% of built Bangalore is roofs.
      • What do we do about them?
      • Heat sinks
      • or
      • Designed Ecological spaces
      • The choice is ours.
  • 24.