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Rain Water Harvesting

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1. Presentation Poster

  1. system

  2. Roof

  3. Gutter + Rain pipe

  4. Water Tank

  5. Delivery Pipelines

  6. examples

  7. Rainwater harvesting (wikipedia)

    https://en.wikipedia.org/wiki/Rainwater_harvesting

  8. possibility in Bhutan

  9. traditional building structure in Bhutan

    1. large roof

    2. space between roof and top of the building, where the water tank can be installed

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  10. rain fall potential in Bhutan in monsoon

    screen shot 2023-07-23 at 1.07.59

  11. example

    • Supply
      • monthly precipitation in Paro, May to September ; approximately 300 mm / 30 days -> 0.01 m / day [A]
      • total roof area of student hostels ; 7200 m2 (square meters) [B]
      • harvestable rain amount ; 72 m3 / day -> 72000 litters / day [c] = [A] x [B]
    • Demand
      • required water amount ( for flushing + dining + cooking + shower ) ; 135 litters / day / person [D]
    • Supply [C] / Demand [D] = 533 (person)

  12. testing

  13. rain water collection test at student dormitory on 18th July, 2023

    1. about 1000 ml water was collected in 8 minutes.

    2. visual check ; clean, no color

    3. TDS analysis ; 4.5 (which is the lowest value we measured, showing the purity of the water)

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  14. proposals

check the feasibility, and scale the system as step by step basis

  1. Phase 1 – feasibility study at dormitory

    1. check the allowable tank weight on the building
    2. install small (about 1 m3) tank
    3. guide to toilet by simple piping
    4. use as gray (mid quality) water for toilet flushing

  2. Phase 2 – implementation in the campus

  3. Phase 3 – propagation to other ares in Bhutan

Last update: July 26, 2023