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THE RAIN WATER HARVESTING PROJECT AND CALCULATOR

PROJECTED VOLUME, MARKET VALUE

JED GUINTO JUNE 26, 2026

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WHY SHOULD WE COLLECT RAINWATER?

UPSIDES

  • Rain water is clean, good as distilled water
  • Contains gases that is beneficial to plants
  • Free and abundant

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WHY SHOULD WE COLLECT RAINWATER?

DOWNSIDES

  • Gets contaminated with the pollutants in the atmosphere and roof tops
  • Requires construction of holding tanks and cisterns

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WHY SHOULD WE COLLECT RAINWATER?

NATURE’S FLOW

  • Rainwater will PERCOLATE on the ground and be stored in the aquifers
  • Where it flows out from springs and creeks
  • Or can be extracted

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WHY SHOULD WE COLLECT RAINWATER?

HOWEVER

  • Deforestation
  • Barren farm lands, surface run-off, soil erosion
  • Concrete structures
  • Re entry is sealed off thus, flood waters

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WHY SHOULD WE COLLECT RAINWATER?

DURING EL NINO?

  • El Nino will intensify from now (June 2026) until early 2027
  • But rains is still expected to fall, unpredictable and torrential
  • We should prepare and catch this limited supply because when it comes, it will come very heavy

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WHY SHOULD WE COLLECT RAINWATER?

THE RAINFALL DATA FROM PAG-ASA 2026

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Months 2026

Rainfall Normals (mm)

Actual and Projected Rainfall (mm)

January

301.90

642.00

February

226.80

309.90

March

186.50

78.50

April

121.10

13.60

May

25.60

25.60

June

45.10

45.10

July

243.90

97.56

August

177.30

70.92

September

266.90

106.76

October

489.60

195.84

November

522.10

208.84

December

687.30

274.92

RAINFALL DATA 2026 PAG-ASA, Daet, Camarines Norte

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WHY SHOULD WE COLLECT RAINWATER?

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WHY SHOULD WE COLLECT RAINWATER?

BASIC DESIGN CONCEPT

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    • Elevated rain barrel
    • First flush diverter
    • filters

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THE RAIN WATER CALCULATOR

  • Volume of Rain Water VRw = Rw X Ra
    • Rw : Expected Rainfall for the Month based on Rainfall Normals
    • Ra : Roof Area of the building/house
  • Market Value of Rain Water MVRw = VRw X Mv X dwc
    • Mv : market value based on the prevailing CNWD/Prime Water Bills which is Php 272.32/10 m3 = Php 27.32 / m3
    • dwc : drinking water coefficient: 0.7 this represents the reduced value of the rain water in comparison. The 30 % reduction represents the cost of converting the rainwater to become a potable drinking water which includes additional filtration, pasteurization and re-mineralization
  • Potential Number of Households to be Served: Phh = VRw / 10 m3 ;
    • 10 m3 is the assumed maximum consumption of an average HH

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RAIN WATER VOLUMES AND MARKET VALUES

  • Regular Household
    • Roof Area: 25 m2
    • Volume of Rainfall to be Collected in 2026 : 103.48 m3
    • Average Monthly Collection: 8.62 m3
    • Market Value : Php 1,972.27

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RAIN WATER VOLUMES AND MARKET VALUES

  • Provincial Capitol Building, Annex and Sports Center
    • Total Roof Area: 3,139.5 m2
    • Projected Volume of Rainfall to be Collected in 2026 : 30,308.4 m3
    • Average Monthly Volume: 2,525.70 m3
    • Potential Number of HH Served: 253
    • Market Value : Php 577,678.36

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RAIN WATER VOLUMES AND MARKET VALUES

  • Bagasbas Convention Center

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    • Total Roof Area: 5,747.70 m2
    • Projected Total Volume of Rainfall to be Collected 2026 : 23,790.19 m3
    • Average Monthly Volume: 1,982.27 m3
    • Potential Number of HH Served: 199
    • Market Value : Php 453,441.02

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RAIN WATER VOLUMES AND MARKET VALUES

  • Camarines Norte Provincial Hospital (CNPH)
    • Total Roof Area : 9,9543.57 m2
    • Projected Total Volume of Rainfall to be Collected 2026: 41,157 m3
    • Average Monthly Volume: 3,429.77 m3
    • Potential Number of HH Served: 342
    • Market Value : Php 784,456.84

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RAIN WATER VOLUMES AND MARKET VALUES

  • Daet LGU : Municipal Building, Sangguniang Bayan Building and Covered Court
    • Total Roof Area: 3,388 m2
    • Projected Total Volume of Rainfall to be Collected 2026 : 14,023.20 m3
    • Average Monthly Volume: 1,168.60 m3
    • Potential Number of HH Served: 117
    • Market Value : Php 276,282.25

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RAIN WATER VOLUMES AND MARKET VALUES

  • St. John the Baptist Church
    • Total Roof Area : 3,553.2 m2
    • Projected Total Volume of Rainfall to be Collected : 14,706.98 m3
    • Average Monthly Volume: 1,225.58 m3
    • Potential Number of HH Served: 123
    • Market Value : Php 280,315.02

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RAIN WATER VOLUMES AND MARKET VALUES

  • Cathedral, Carillon Hall, Diocese of Daet Building
    • Total Roof Area : 4,077.8 m2
    • Projected Total Volume of Rainfall to be Collected 2026: 16,878.34 m3
    • Average Monthly Volume: 1,406.53
    • Potential Number of HH Served: 140
    • Market Value : Php 321,701.17

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NEX T STEPS

  • From rainwater to potable drinking water
  • Water Filters
  • Activated carbon from pili shells and coconut shells
  • Community Based Water Stations

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TapLing (Tapayan Uling) by Bahay Teknik March 2026

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NEXT STEPS

    • Hold skills training for Plumbers and Water Masters
      • Training courses with TESDA
      • Accreditation system for accredited installers, inspectors
    • Allocate funds for rain water collection systems : households, establishments
    • DRR Funds? Calamity Fund?
      • Application process
      • Disbursements : vouchers for supplies, tools and materials
      • Installation : vouchers to pay for services of installers and technicians
      • Monitoring and Evaluation

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  • For more information, please contact

Jed Guinto

Bahay Teknik Product Development Services https://web.facebook.com/bahayteknik

Cp 0998 545 5765

Email : jed.building.bridges@gmail.com

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